Method of determination of an alcohol concentration in solutions (versions) and a device for its realization (versions)

FIELD: methods and devices for determination of an alcohol concentration in solutions.

SUBSTANCE: the invention presents a method of determination of an alcohol concentration in solutions (versions) and a device for its realization (versions). The first version of the method provides for placement of a bath with the reference and investigated solutions on the path of the optical beam, measuring and introduction into the memory of the computation unit of intensity of the light absorption by the reference solutions, measuring of the intensity of the light absorption of radiation of the investigated solution, processing the data of the measurements of the light absorption. The investigated solution is transilluminated within the range of the wavelengths of 1250-1350 nanometers. Simultaneously with the measurement of the light absorption by the investigated solution measure the concentration of alcohol in it. In compliance with the received values determine a concentration of alcohol in the investigated solution. The second version of the method provides for placement of a bath with the reference solutions and investigated solutions on the path of the optical beam, measurement and introduction into the memory of the calculation device of intensity of the light absorption of radiation by the investigated solution, processing of the received values of the measurements of the light absorption. The investigated solution is transilluminated within the range of the wavelengths of 1250-1350 nanometers, measure the values of density of the reference solutions and the investigated solution, using which determine the concentrations of alcohol and sugar in the investigated solution. The device for the first version contains a computation unit, a conjunction unit, optically coupled a radiating unit, a bath for solution, a measuring photoreceiving device, the output of which is connected through the conjugation unit with the computation unit and the input of which is optically connected through the bath with the radiating unit. The device for measurement of a concentration of sugar in a solution consists of a beam splitter plate and an additional photoreceiving device, the output of which is connected through the conjugation unit with the computation unit. The input of which is optically connected through the beam splitter plate mounted at Brewster's angle to a axis of radiation and the bath with by a radiation unit. And the radiation unit has the wavelength of radiation laying within the range of 1250-1350 nanometers. The device for determination of a concentration of alcohol in the solutions consists of the computation unit, the conjugation unit, the optically connected radiation unit, the bath for solution, the measuring photoreceiving device, output of which is connected through the conjugation unit with the computation unit, the density gage connected with the bath by means of the pipe duct. The output of the density gage is connected through the conjugation unit with the computation unit. The radiation unit has the wavelength of radiation laying within the range from 1250 to 1350 nanometers. The invention allows to improve accuracy of measurements.

EFFECT: the invention ensures an improved accuracy of measurements.

12 cl, 5 dwg

 

The invention relates to the food industry and can be used on wine, liquor and alcohol industries and other enterprises of the food, perfumery and other industries.

Known methods and devices for research of alcoholic beverages based on different physical principles.

In the author's certificate No. 544917 (B. I. No. 4, 1977) and the copyright certificate №938154 (B. I. No. 23, 1982) proposed ways to influence the flow of electromagnetic waves on a water-alcohol mixture and fixing in the first case the phase shift between the incident and reflected fluxes, which is judged on the concentration of aqueous solutions of alcohol, and in the second case, the phase shift between the input and output signals in the reference and controlled solutions, bringing phase shifts equal to the values of the frequency change of the input signal, which determines the concentration of the solution.

In the patent 4410781 C2 G 01 N 35/00 DE G 06 K 7/10, G 01 N 23/223, G 01 N 35/04 Siemens AG, 1995, presents a device for identification and manipulation of samples in the automatic transmission of the analyzing device. The device has a media sample in which the sample is placed in a raster, and the receiver samples, which moves over the sample, shining through them, shooting, including a code printed on the sample. A significant drawback of this device is istwa is the presence of media samples, limiting the list of tested solutions, requiring for its operation a manipulating device recognition image, on the production of special services that support excellence solutions in time (taking into account the factor of aging, evaporation of the alcohol, separation and digestion solutions etc). In the end this solution, differing cumbersome, expensive, difficult maintenance, not a universal tool that could be applied in the wine and beverage production with a wide range of manufactured solutions.

In the patent of the Russian Federation G 01 N, 3/14 No. 2142630 (B. I. No. 34, 1999) proposed a method of rapid quality control of alcoholic products for their identification, consisting in conducting the two-channel correlation spectroscopy by directions on the sample of the laser light flux with the subsequent registration of the scattering signals that flow in two directions and after appropriate processing of comparing the obtained results with the corresponding values of the reference samples, and ultimately determine the quality of alcohol liquids according to the comparison result. Thus, for this device, as with the previous devices required is the presence of standard solutions that dramatically narrows the scope at which a change such devices.

In the patent of the Russian Federation G 01 N, 3/14 No. 2082967 (B. I. No. 18, 1997) (the prototype of the invention, a method is proposed based on spectral-selective measurement of absorption of light passed through a cuvette containing the test solution, the predefined characteristic wavelengths λ1=920,8 nm and λ*that is a point of maximum light absorption of the alcohol. The choice of wavelength is produced on the basis of the dependency of the spectral absorption of water-alcohol solution, distilled water and ethyl alcohol obtained by standard spectrophotometric device "Hitachi-4000". The method includes sampling the studied solution, the location of the cell with the sample in the optical path of the beam, measuring the absorption of radiation in a ditch on the predefined characteristic wavelengths, one of which is equal to 920,8 nm, and the other is located near the first and is determined by the maximum light absorption, measurement of the same parameters on a standard sample solution, comparison and processing of the results obtained with the determination by the formula alcohol concentration.

This solution for measuring the concentration of alcohol in sugar-containing solutions requires early input on the concentration of sugar in solution, and then compares the obtained values of light absorption in the cell with the test and the reference solutions, with low measurement accuracy, defined low range signal changes depending on the strength of the solution and a strong influence on light absorption concentration of sugar.

None of these solutions has the ability to measure the concentration of alcohol in sugar-containing solutions without the prior settings for recording (input) the concentration of sugar in solution, which makes the known methods are inaccurate and long-lasting.

The technical result of the claimed invention is to simplify the determination of alcohol concentration in solutions and improve the accuracy of the results due to the fact that the measured concentrations of alcohol and sugar solutions produced without conducting any additional settings, including their continuous passage.

The technical result is achieved due to the fact that in the method (1-mu option) place the cuvette containing the reference and test solutions on the optical path of the beam, measured and contribute in memory of the computing device, the intensity of light absorption of the radiation of the reference solutions, measure the intensity of light absorption of the investigated solution, process measurement results and the test solution x-ray radiation in the wavelength range 1250-1350 nm, simultaneously with the measurement of light absorption test solution u which are the concentration of sugar in it, according to the obtained values determine the alcohol concentration in the test solution.

In addition, record a change of the radiation power and corrects the measurement result.

In addition, measure the temperature of the investigated solution, calculate the temperature correction and the results of measurement values at a temperature of 20°C.

The technical result is achieved due to the fact that in the method (2nd option) place the cuvette containing the reference and test solutions on the optical path of the beam, measured and contribute in memory of the computing device, the intensity of light absorption of the radiation of the reference solutions, measure the intensity of absorption of the radiation of the test solution, processing the results of measurements of light absorption, the solution being analyzed x-ray radiation in the wavelength range 1250-1350 nm (measured density values of the reference solution and test solution, which determine the concentration of alcohol and sugar in the studied solution.

In addition, record a change of the radiation power and corrects the measurement result.

In addition, measure the temperature of the investigated solution, calculate the temperature correction and the results of measurement values at a temperature of 20°C.

The technical result is achieved due to the fact that the device (1-m is option) contains the computing device, interface unit, optically coupled to the emitter, the cell solution, measuring photodetector, the output of which is connected through the coupling with the computing device, a device for measuring the concentration of sugar in solution, the output of which is connected through the coupling with the computing device, and the input optically connected through a cuvette containing the emitter, the device for measuring the concentration of sugar in solution consists of a beam-splitting plate and additional photodetector device, the output of which is connected through the coupling with the computing device, and the input optically connected through the beam-splitting plate, mounted at the Brewster angle to the axis of the radiation, and a cell with emitter and the emitter has a wavelength in the range of 1250-1350 nm.

In addition, the device contains a reference photodetector and an additional beam splitter plate, and the reference photodetector via an additional beamsplitter plate is optically connected with the emitter, and its output is connected through the coupling with the computing device.

In addition, the device comprises measuring the temperature of the investigated solution, installed in a ditch and coupled through the device interfacing with the computing mouth what Euston.

The technical result is achieved due to the fact that the device (on the 2-nd version) contains a computing device, interface unit, optically coupled to the emitter, the cell solution, measuring photodetector, the output of which is connected through the coupling with the computing device, a density measuring device connected to the cuvette using a pipeline, the output of the densitometer is connected through the coupling with the computing device, and the emitter has a wavelength in the range of 1250-1350 nm.

In addition, the device contains a reference photodetector and an additional beam splitter plate, and the reference photodetector via an additional beamsplitter plate is optically connected with the emitter, and its output is connected through the coupling with the computing device.

In addition, the device comprises measuring the temperature of the investigated solution, installed in a ditch and coupled through the coupling with the computing device.

For both the options presented for the determination of two unknown - alcohol and sugar solutions you need to solve two equations and, respectively, be the product of two unit of measurement these unknowns. One of these equations is known, f is rmula the Bouguer-Lambert-Bera

where I is the light intensity after passing through a medium d;

I0the intensity of the light source at the entrance of the absorbing layer protection;

C - concentration of the solute;

A - constant-dependent properties of the dissolved substance and the wavelength of light.

Figure 1 presents the dependence of the intensity of light absorption on wavelength.

Methods and devices for implementing this equation is based on the x-raying of the cuvette with the solution of the optical beam in a wavelength range that are critical to the presence of sugar and alcohol in solutions. From figure 1 it is seen that at wavelengths λ=1250...1350 nm measured absorption signals have the greatest range and vary from 0,265 water to 0,765 for alcohol, i.e. 2,887 times (see figure 1). As shown by experimental studies, the measured intensity of light absorption also depends on the sugar content.

Figure 2 presents the dependence of the intensity of light absorption from alcohol concentration for solutions with different concentrations of sugar.

Another equation must contain the same unknown or at least one of them.

Technical solution for 1-th variant based on the known dependence of the rotation angle of the polarization plane from sugar solutions (M. Jaworski, AAD tlaf, Handbook on physics for engineers and students, "Nauka", M., 1979, s):

where ϕ - the angle of rotation of the plane of polarization;

α specific rotation;

ρ is the density of the solution;

To - weight concentration (mass of optically active substances (sugar) to the weight of the entire solution);

d is the path length of the light beam in solution.

As a device for the implementation can be used sharker - optical device for measuring the concentration of sugar in solution, based on the rotation of the plane of polarization of the light wave when passing through an optically active substance, which is a solution containing sugar (see, for example, Ivelaw, General physics, Vol.2, M., "Nauka" 1978, s). Examples of sheremetov SU-3, SU-4, SL, A1-EPO, see the Instructions for chemical and microbiological control of alcohol production, ISD, M., AGROPROMIZDAT, 1986, p.7-11. Can be built saaremere on the basis of the law of Brewster.

Thus the method according to option 1 is to place the cuvette with the sample solutions on the path of the optical beam. This measures the intensities of the light absorption of the reference solutions. Define, for example, the values of I0and the coefficients Ad from the formula (1)characterizing the properties of opto-electronic systems and the solution of the frame of the substance and the wavelength (for a specific sample for different solutions these values are represented on the curves in figure 2). Parametric family of curves intensities of light absorption (Y-axis) for solutions with different alcohol content (X axis) at different sugar content, obtained on the basis of the fabricated sample is shown in figure 2. The coefficients of the formulas, the Bouguer-Lambert-Bera for solutions with sugar content of 0, 10, 20, 40% define the characteristics of the optical system and the properties of solutions, namely: the length of the cell d, the intensity of the light source at the input layer of the absorbing medium I0the concentration of the solute, a constant dependent on the properties of the solute and the light wavelength A. the Results of these measurements make reference samples in memory of the computing device.

After transmission of the cell with the test solution and measuring the concentration of sugar with the use of the effect Brewster or by using a known sheremetov measure the intensity of light absorption and the computed values determine the alcohol concentration in the test solution.

To increase the accuracy of measurement of the intensities of the light absorption of the radiation record a change of power and correcting the measurement result.

As the alcohol concentration depends on temperature, then measure the temperature of the investigated solution, calculate the temperature correction and the results of measurements taken to the in practice, the values of the concentration at a temperature of 20° C.

Figure 3 shows the block diagram of the device for determining the alcohol concentration in solutions for option 1 with the device measuring the concentration of sugar with the help of saaremere based on the effect of Brewster.

The device includes a computing device 1, device 2, optically coupled emitter 5, the cell for solution 4, the measuring photodetector 7, the output of which is connected through the interface unit 2 with the computing device 1, the device for measuring the concentration of sugar in solution 9, the output of which is connected through the interface unit 2 with the computing device 1, and the input optically connected through the cell 4 emitter 5, the device for measuring the concentration of sugar in solution 9 consists of a beam-splitting plate 13 and additional photodetecting device 14, the output of which is connected through the interface unit 2 with the computing device 1, and the input optically connected through the beam-splitting plate 13 mounted at the Brewster angle to the axis of the radiation, and cell 4 emitter 5, and the emitter 5 has a wavelength in the range of 1250-1350 nm.

The inlet pipe branches off from the main drain line, the input may be posted by the solenoid 3. Through the interface unit 2, the valve 3 is connected to computing device is the your 1. Cuvette 4 is connected to the drain line.

To commit the changes of the output power to the cell 4 is placed an additional beamsplitter plate 6 and the reference photodetector 8, and the reference photodetector 8 via additional beam-splitting plate 6 is optically connected with the emitter 5, and its output is connected through the interface unit 2 with the computing device 1.

Measuring the temperature of the investigated solution 12 is installed directly in the cell 4 and is connected through the interface unit 2 with the computing device 1.

The operation of the device according to the variant 1.

In the configuration phase fill the cuvette with distilled water and memorize in the memory of the computing device 1 signals taken from measuring and additional photodetectors 7 and 14, corresponding to zero values of the concentrations of alcohol and sugar. Then repeat this operation with a water-alcohol solutions with pre-measured concentrations of alcohol and sugar, for example, using hydrometer, thermometer and apparatus for the distillation of alcohol from the solution by the method of GOST R 51135.

By pressing keys on the keyboard (console) of the computing device 1 or according to a given program open the solenoid 3, the solution fills the cuvette 4, changing the light absorption while filling, after stabilization meant the I signal, remove from measuring and additional photodetectors 7 and 14, consider the corresponding measured concentrations of alcohol and sugar in the solution.

From the cell 4 the solution into the main pipeline. The computing device 1 receives the values from the photodetectors characterize the solution. The signal produced additional photodetecting device 14 contains information about the content of the sugar solution, with which the signal produced by the measuring photodetecting device 7, gain values of the concentration of alcohol in the solution.

The method according to option 2 is to place the cuvette with the sample solutions on the path of the optical beam. This measures the intensities of the light absorption of the reference solutions using radiation in the wavelength range 1250-1350 nm, which is recorded in the memory of the computing device. The second equation is obtained by measuring the density of the solution which depends on the concentrations of sugar and alcohol.

Measuring the light absorption of the investigated solution is produced simultaneously with the measurement of fluid density, the measured values of density and intensity of light absorption of the investigated solution determine the concentration of alcohol and sugar researched solution.

When solving equations in implicit form at salahor the current measurement is recorded in the memory of the computing device, the measured values of the intensities of the absorption and density of the reference solutions to create a field, characterizing properties of optical-electronic system and the solute and wavelength (for a specific sample for different solutions these values are represented on the curves in figure 5, where the X-axis is the density of the solution, and the Y - axis the intensity of light absorption). Here each point with the measured density values of the solution and the intensity of light absorption, corresponding values of the concentrations of alcohol and sugar.

After x-raying the analyzed solution and measuring the intensity of light absorption and the density of the solution using interpolation to determine the concentration of alcohol and sugar.

Figure 4 shows the block diagram of the device according to option 2, using the densitometer.

The device includes a computing device 1, device 2, optically coupled emitter 5, the cell for solution 4, the measuring photodetector 7, the output of which is connected through the interface unit 2 with the computing device 1, the density measuring device 9 connected to the cuvette 4 using pipeline, and the output of the density measuring device 9 via the interface unit 2 is connected with the computing device 1, and the emitter 5 has a wavelength in the range of 1250-1350 nm.

The density measuring device 9 can be performed, for example, in the form of a calibrated volume of the tank 10, placed on the electronic scale 11, the paired through us is the device pairing 2 with the computing device 1, and connected to the drain line. The inlet pipe branches off from the main drain line, the input may be posted by the solenoid 3. Through the interface unit 2 photodetector 7, the solenoid 3 is connected with the computing device 1.

As for option 1, for fixing the changes of the output power to the cell 4 is placed an additional beamsplitter plate 6 and the reference photodetector 8, and the reference photodetector 8 via additional beam-splitting plate 6 is optically connected with the emitter 5, and its output is connected through the interface unit 2 with the computing device 1.

Measuring the temperature of the investigated solution 12 is installed directly in the cell 4 and is connected through the interface unit 2 with the computing device 1.

The work of the proposed device.

In the configuration phase fill the cuvette 4 and the calibrated volume of the tank 10 with distilled water and memorize in the memory of the computing device 1, the signal produced by the measuring photodetecting device 7 corresponding to zero concentrations of alcohol and sugar, and with electronic scales 11 remove the signal corresponding to the density of water. Then repeat this operation with a water-alcohol solutions with pre-measured concentrations of alcohol and is of Achar, for example, using hydrometer, thermometer and apparatus for the distillation of alcohol from the solution by the method of GOST R 51135.

By pressing keys on the keyboard (console) of the computing device 1 (or for a given program) open the solenoid 3, the solution fills the cuvette 4, changing the light absorption by filling the stabilization of the value of the signal produced by the measuring photodetecting device 7 corresponds to the measured concentrations of alcohol and sugar solution. After the cuvette 4 solution comes in a calibrated volume of the tank 10, as it is filled which changes the testimony of electronic scales 11. Stabilization of these observations indicates that the tank 10 is full, and you can remove the reference that comes to computing device 1 to calculate the density of the solution. From the tank 10 the solution into the main pipeline. The computing device 1 receives the values from the photodetection device 7, and density values that characterize the solution, i.e. get all the data needed to calculate the concentrations of alcohol and sugar.

The device was made on the basis of the continuous semiconductor laser wavelength 1300 nm with an average laser power of 5 mW, photodetectors on the photodiodes of the type FDA and electronic scales type PV-6.

Figure 5 presents the data field to determine the concentrations of alcohol and sugar solutions on the measured intensity values of light absorption and the density of the solution. Here on the X axis is density values, and Y - axis respectively, the intensity values of light absorption. The obtained data field of each point corresponds to a solution characterized by a pair of values of concentration of the alcohol-sugar. Curves, equipped with the words "concentration of 0, concentration of 9.5%",...... "concentration 33%"represent contours alcohol concentration, and the curves with label "0 sugar", "sugar 10%",......, "sugar 40%"represent isolines of concentration of sugar.

To normalize the power of the radiation source is introduced reference photodetector 8 is also based photodiode FDA with additional beam-splitting plate 6.

Conversion of measurement results to the adopted according to GOST temperature of 20°produced by "Tables for the determination of ethyl alcohol in water-alcohol solutions", M., IPC Publishing standards, 1999, and "Instructions for chemical and microbiological control of alcohol production), Agropromizdat, 1986

As the temperature meter was used thermometer platinum technical TPT-2, register No. 15420-96, manufactured by CJSC "Termico".

Experimental studies have shown that the achievable are the following characteristics:

the absolute error of measurement of the concentration of the wine, liqueurs the exploration and water-alcohol solutions - not more than 0.5% vol. (regardless of the percentage of sugar);

the absolute error of measurement of the concentration of sugar in solution is not more than 0.3%.

1. The method of determining the alcohol concentration in solutions, providing the location of the cell with the reference and test solutions on the path of the optical beam, the measurement and inclusion in the memory of the computing device, the intensity of absorption of the reference solutions, the measurement of the intensity of light absorption of the radiation of the test solution, the processing results of measurements of light absorption, characterized in that the test solution x-ray radiation in the wavelength range 1250-1350 nm, simultaneously with the measurement of light absorption test solution measure the concentration of sugar in it, on the obtained values determine the alcohol concentration in the test solution.

2. The method according to claim 1, characterized in that record a change of the radiation power and corrects the measurement result.

3. The method according to claim 1, characterized in that the measured temperature of the investigated solution, calculate the temperature correction and the results of measurement values at a temperature of 20°C.

4. The method of determining the alcohol concentration in solutions, providing the location of the cell with the reference and test solutions on the path of the optical beam, the measurement and in Esenia in memory of the computing device, the intensity of light absorption standard solutions, the measurement of the intensity of light absorption of the radiation of the test solution, the processing results of measurements of light absorption, characterized in that the test solution x-ray radiation in the wavelength range 1250-1350 nm, measured density values of the reference solution and test solution, which determine the concentration of alcohol and sugar in the studied solution.

5. The method according to claim 4, characterized in that record a change of the radiation power and corrects the measurement result.

6. The method according to claim 4, characterized in that the measured temperature of the investigated solution, calculate the temperature correction and the results of measurement values at a temperature of 20°C.

7. Device for determining the alcohol concentration in solutions containing computing device, interface unit, optically coupled to the emitter, the cell solution, measuring photodetector, the output of which is connected through the coupling with the computing device, characterized in that it comprises a device for measuring the concentration of sugar in solution, the output of which is connected through the coupling with the computing device, and the input optically connected through a cuvette containing the emitter, the device for measuring the concentration of sugar in solution consists of sittenfeld the second plate and an additional photodetector device, the output of which is connected through the coupling with the computing device, and the input optically connected through the beam-splitting plate, mounted at the Brewster angle to the axis of the radiation, and cell emitter, and the emitter has a wavelength in the range of 1250-1350 nm.

8. The device according to claim 7, characterized in that it contains a reference photodetector and an additional beam splitter plate, and the reference photodetector via an additional beamsplitter plate is optically connected with the emitter, and its output is connected through the coupling with the computing device.

9. The device according to claim 7, characterized in that it comprises measuring the temperature of the investigated solution, installed in a ditch and coupled through the coupling with the computing device.

10. Device for determining the alcohol concentration in solutions containing computing device, interface unit, optically coupled to the emitter, the cell solution, measuring photodetector, the output of which is connected through the coupling with the computing device, characterized in that it comprises a densitometer connected to the cuvette using a pipeline, the output of the densitometer is connected through the coupling with the computing device is om, and the emitter has a wavelength in the range of 1250-1350 nm.

11. The device according to claim 10, characterized in that it contains a reference photodetector and an additional beam splitter plate, and the reference photodetector via an additional beamsplitter plate is optically connected with the emitter, and its output is connected through the coupling with the computing device.

12. The device according to claim 10, characterized in that it comprises measuring the temperature of the investigated solution, installed in a ditch and coupled through the coupling with the computing device.



 

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1 dwg

FIELD: technologies for researching durability properties of packing washer materials for collapsible oil pipelines.

SUBSTANCE: in the method for determining remaining resource of rubber compacting curves utilized in oil pipeline junctions, preparation of samples of given geometrical shape is performed, measurement of source hardness conditions for stretching, relative elongation during tearing, Shore hardness, temperature fragility limit, comparison of aforementioned values to given values, culling of washers, sample coefficients of which do not correspond to given values. Remaining samples are exposed to oil product after extraction from oil product samples are thermostatted, cooled down to normal room temperature, and then the same physical-mechanical coefficients are measured again with limit values. Before preparation of samples with given geometrical shape, washers are organized in batches of same manufacturing plant and production year, additionally measured are external d1 and internal d2 washer diameters for each batch, relative compression Ecp deformation of same washers. Their deviation from standard is calculated and culling of aforementioned washer batches is performed on basis of allowed values Δd1, Δd2 and Ecp, while as allowed values Δd1, Δd2 ≤ 3%; 25% ≤ Ecp ≤ 70%. After that remaining rings with least values of relative compression deformation Ecp are utilized to prepare geometrical samples of given geometrical shape. Remaining resource ΔT is determined from following formula: years, where ki - coefficient, characterizing alteration of remaining resource ΔT dependently on climatic zone input of operation of rubber packing washers, is taken as i - climatic zones I1 - II12, additional information, T - average lifetime of rubber packing washers until removal from operation in accordance to technological characteristics provided by manufacturing plant and/or operation instructions, in years, Tn - period of operation of rubber packing washers since production year - marking of manufacturing plant, until moment of determining ΔT, years, f=9,4 MPa - minimally allowed value of conditional hardness for stretching after thermostatting of sample, MPa.

EFFECT: reliable trustworthiness of results of estimation of remaining resource under dynamic conditions of rubber packing washers in oil pipeline junctions with simultaneous increase of ecological safety due to decreased risk of emergency spilling of oil products.

4 dwg

FIELD: investigating or analyzing materials.

SUBSTANCE: method comprises preparing specimens of polymeric materials of specified mass, exposing the specimens to the hostile fluid at a given temperature, and determining informative characteristic from a formula proposed.

EFFECT: enhanced reliability.

2 dwg, 7 tbl, 2 ex

FIELD: weighing equipment; chemical mechanical engineering.

SUBSTANCE: method can be used for measuring content of binder in reel-up composite material produced by preliminary soaked thread. Method is based upon weighing. The constant values are determined according to the method as length of thread for specific type of items and value of linear density averaged for any reel before and after soaking by binder and reeling it up onto frame. Weighing is performed for item before reeling it up with soaked thread and after reeling-up and final polymerization of composite material to determine mass of composite. Basing upon the data received, content of thread is determined which value is subsequently used for finding mass content of binder in composite from relation of C=(M-LxT/M)x100%, where C is content of binder in composite, in mass percent; M is mass of composite, g; L is length of thread consumed for item, km; T is average arithmetic meaning of values of linear density of thread and its rests at any reel before and after impregnation, g/km.

EFFECT: higher stability of performance measures.

1 ex

FIELD: light industry.

SUBSTANCE: method comprises recording response of the material to be tested that represents an amplitude-frequency characteristic, calculating deformation characteristics, and determining the value of distributed mass of the vibrating part of the material. The response representing two amplitude-frequency characteristics is recorded for the same part of the material to be tested for various masses of two bodies that cause deformation. The deformation characteristics are calculated from equations of vibration theory for viscoelastic bodies.

EFFECT: enhanced precision and reliability.

FIELD: investigating or analyzing of materials.

SUBSTANCE: method comprises investigating threshold capabilities of the multi-layer polymeric material and determining maximum permeability of oil product and time period required for reaching the maximum permeability.

EFFECT: enhanced reliability.

1 dwg, 1 tbl

FIELD: investigating or analyzing of materials.

SUBSTANCE: method comprises preliminary conditioning of rubber specimens in paraffin hydrocarbon with 12-16 atoms of carbon in the atmosphere of neutral gas and in the fuel to be tested at a temperature of 130-150°C for 3-5 hours.

EFFECT: enhanced reliability.

1 dwg, 2 tbl, 1 ex

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