Device for measuring permittivity of dielectrics

IPC classes for russian patent Device for measuring permittivity of dielectrics (RU 2251705):

G01R27/26 - Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants

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FIELD: measuring engineering.

SUBSTANCE: device comprises indication unit, electronic measuring unit, sensor, and control members. The indication unit and measuring electronic unit are mounted in a single housing. The sensor is a cylindrical plate-type capacitor.

EFFECT: enhanced accuracy of measuring.

6 cl, 4 dwg

The invention relates to measuring technique and can be used in industry to measure and control the dielectric constant (constant) liquid and gaseous dielectric environments, such as oil refineries, tank farms, as well as in the operational systems measurement and control, particularly in field conditions (Express method), in retail trade of petroleum products, gasoline stations, individual motorists and in various technological processes.

Known measuring device for the study of dielectric parameters of liquid and solid samples containing a stepped coaxial transition, coupled with the hollow briefly closing element connected to the source of the " oven " of liquid, high-frequency connector, insulating washer and fitting (USSR author's certificate No. 1698831 A1, IPC: G 01 R 27/26, 31.10.1989,).

Known portable device for quality control of fuel that contains drain hose, one end of which a tip for connection to the fuel tank of the machine and picking samples of fuel, transparent body, a nozzle mounted on the other end of the drain hose connected to the intake valve, located on the lower transparent cover enclosure, three communicating with each other cameras, see sterowanie inside the transparent housing, in the first of which is NetIdentity, the second hydrometer, and the third camera is an observation (a utility model certificate No. 0003827, G 01 R 33/22, 9/14, 23.08.95).

A device for measuring technical characteristics (including the dimension of the dielectric constant) dielectric media, such as liquid fuel in the working tank containing the source and the radiation detector, optically associated reflective prism with a gap between them, two adjacent hollow tubes, the ends one of which is attached reflective prism, and the ends of the other tube connected with a source and a radiation receiver, in addition, the device includes a display and a screen with a calibrated holes corresponding to the maximum transmittance of the reference fuel brands (a utility model certificate No. 0006630, G 01 N 33/22 from 16.05.98).

All of these devices have a common significant drawbacks, the main of which are the interference in their work, as well as the fact that when using devices operating with microwave radiation, there is a distortion in the measurement of parameters, in particular the decrease in the accuracy of their measurement associated with the influence of radiation on the properties of the investigated dielectric environments, and the resulting measurements of the performance parameters and indicators of errors is stabilny in time. Besides, basically all of these devices are bulky and, as practice has shown, their application is limited.

The closest analogue of the claimed device and taken as a prototype, is a well known device for measuring the dielectric constant of the dielectric environments, which are described in the method for the contactless measurement of the dielectric constant of the dielectric substance, protected by the RF patent №2115935 C1, G 01 R 27/26, G 01 F 23/26, priority: 16.04.1992,

The known device for measuring the dielectric constant of the dielectric environments contains a sensor, measuring electronic means and the display unit, controls, and the sensor includes two parallel overlapping conductive plates electrically insulated from each other, which is supplied with alternating voltage of high frequency. The sensor operates on the principle of a capacitor.

The specified device has all the disadvantages of the aforementioned analogues. In addition, the disadvantages of this device are also the inability to measure the dielectric permittivity of gaseous media; it works only in stationary mode (it is permanent) and use it in the Express-analysis is not possible; virtually the device is used only to measure, as to control the decree is sent to the steering parameter, this process is technically impossible to carry out, as it does not have a high accuracy of measurement, moreover, it works only in stationary mode.

The main objectives of the claimed technical solution the device for measuring the dielectric constant of the dielectric environments are:

- achieve a high degree of measurement accuracy for optimal low frequency radiation;

- reduced crosstalk;

in order to obtain stability and improving the quality of the output signals with the possibility of not only measuring the dielectric constant, but also its control;

- ability to use the device for a wide range of dielectric environments, namely for liquid and gaseous media.

Other objectives of the claimed invention to provide a device integrated, small (“pocket”), which will give the opportunity to use it quickly (rapid tests) in the field, additionally, the goals are ease of technical execution, the availability of the goods for a wide range of customers and achieving a high enough design solutions.

The essence of the claimed device.

Device for measuring the dielectric constant of the dielectric media is made in monoblock containing the display unit 1 (1, 3, 4), measuring e-the Lok 2 (figure 1, 4), mounted in the same housing 3, a sensor 4, the controls including a power switch 5, switch type of work (toggle switch) 6 and the controller for calibration of indicators dielectric constant different sampling 7, the sensor 4 is a cylindrical plate capacitor, which includes a cylindrical housing 8, with the base opening 9 for receiving the medium and through holes 10 for an air outlet on the side surface, in the upper part, inside of which is installed with a clearance of cylindrical Cup 11 and a cylindrical strut 12 having at the bottom, with internal hand shaped surface and in the upper part, from the outside - emphasis 13 formed by the difference of the outer diameter of the rack 12, and the sensor includes a ring 14 of dielectric material, having in the upper part of the form cylinder, and the bottom shape of a truncated cone and which is set lower based on the stop 13 and at the level of the through-hole 10 of the body 8, the Central three-rod 15 having a height different diameters forming in the upper part of the rod, the stop 16 and is connected with a cylindrical Cup 11 through 17 crosses. The sensor also contains an insulating bushing 18 mounted in the upper part of the body and resting the bottom on the stop 16 of the rod 15. Average net assets is th rod 15 is installed with a clearance relative to the rack 12, and between the lower part and the lower part of the rack 12 are void. In addition, the diameter of the middle part of the rod 15 1.5 times the diameter of the upper part and 2 times the diameter of the bottom.

All compositional elements of the claimed device design (mechanical and electrical), technologically and functionally connected.

The claimed device is illustrated by the following drawings. Figure 1 shows the General view of the device, front view (photo after scanning); figure 2 shows the block diagram of the device; figure 3 - sensor device in accordance with the invention, in section, and figure 4 - sensor device in accordance with the invention, bottom view (photo after scanning).

General view of the device for measuring and controlling the dielectric constant of the dielectric medium are given in figure 1, a front view. The device is a monoblock, comprising sequentially the display unit (digital indicator showing the value of the parameter measured) 1, measuring electronic unit (IAB) 2 mounted in the housing 3 and the sensor 4. The housing 3 is made in the form of a flat elongated parallelepiped.

In addition, the device (1) has controls that includes a power switch 5, switch type of work (toggle switch) 6 and the controller 7 to calibrate the performance of dielectr the political permeability (constant) different samples of oil.

Design solution the device is designed so that it is convenient in maintenance and operation, in particular the housing 3 has a soft, rounded perform with rounded edges and corners, and on its lateral surfaces made ribs, allowing you to comfortably hold the device in your hand when using it.

Figure 2 presents the block diagram of the claimed device. The block diagram includes the following components: a display unit (item 1), measuring electronic unit (IB) (Ref. 2) and the sensor (POS. 4). In turn, IAB scheme includes scaling and adjustment; precision quartz oscillator; a processing circuit of the input signal; the input bidirectional differential amplifier and switching unit. The block diagram of the device and the circuit IB with its elements given only for explanation of the claimed device.

Sensor 4 (3) of the claimed device comprises a cylindrical housing 8 with an opening 9 in the base and through-hole 10 in the upper part mounted inside a cylindrical glass 11, a cylindrical strut 12 with the stop 13, the ring 14 in contact with the casing 8 and the stop 13 of the rack 12, the Central rod 15 with the stop 16, the crossbar 17 and sleeve 18.

The device operates as follows.

The claimed device is an electronic, automated, designed to measure and control the direct Express-method of comprehensive compliance fractions measured oil viscosity up to 10 Centistokes, its control sample permittivity. The device allows to control the oil (any brand of gasoline, diesel fuel and other petroleum products) matching (identity) of the reference pattern on the dielectric permittivity of the tested oil products, such as HEPTANE”. Numerical values of the measured values are read directly on the display unit (digital indicator) in arbitrary units.

Before measurement carried out the following. Include the power supply unit to the mains (220V). On the front of the housing 3 (Fig 1) power switch 5 switch to enable (“on”). Switch 6 switch type of work) to switch to “CONTROL”. Next, holding the device in his hand, the sensor 4 of the device is lowered into the tank up to 250 ml In the last pour of the reference oil “HEPTANE” to the level of the through holes 10 of the sensor 4. The liquid in the instrument comes through the hole 9 of the cylindrical body 8 and fills all gaps and voids of the device, existing between the cylindrical body 8 and a cylindrical Cup 11, between the housing 8 and the ring 14 between the cylindrical Cup 11 and the bar 12, the gap and the space between the cylindrical rack 12 and the rod 15.

Then, without completely removing the sensor 4 from the liquid, producing a slow motion of the surveillance device up and down. Thus, the device is washed and removed any air bubbles that may affect the measurement. Further, the device is removed and is removed from the sensor remains liquid.

The liquid in the tank is re-used to wash the sensor with the subsequent calibration of the device.

The sensor 4 of the device is lowered into the second tank, which is poured “HEPTANE”, and re-conduct the procedure of lowering the sensor into the tank and then dipping. After which the sensor is immersed in liquid and in 5-10 c switch 6 type of work (toggle) switch to the “MEASUREMENT”. On the scoreboard indicator 1 must place the number closer to 00.0. If the numbers on the display will be different from the index 00.0, should the regulator 7 to calibrate the indicator of the dielectric constant to be set on the display unit 00.0. Then pour into a clean container liquid, for example A76, and washed sensor 4 of this gas, as mentioned above. Next, in a clean container pour measured liquid and make measurements, while pre-regulator 7 switch to the “MEASUREMENT”. The numerical values on the display, expressed in arbitrary units, are the values of the dielectric constant of the measured fluid.

Calibration should be done in 4-5 measurements gasoline. In case of clogging of the sensor it wash out what Cetona. The indices of the dielectric constant of gasoline in conventional units for different gasoline must be within the following limits: A76-14-28; AI-30-42; AI-45-70; AI-75-110.

After measuring the power switch 5 on panel 3 mounted on the label: “UFC” and the power supply is disconnected from the network. Power supply: 9 5% (on battery type “Crown”). Consumption current at a voltage of 9 V 5 mA, technical training, after switching on 3-5 c, setting time, 3-5 c continuous operating time: round the clock (limited only by the capacity of the battery), the measurement error of 0.5. The minimum amount of gasoline required for measurements, 150 ml. Frequency sound range normalized from 20 Hz - 20 kHz up to 100-200 kHz. Crosstalk is reduced through the use of low frequency. The sensor is neither transmitter nor receiver.

The claimed device is easy to perform, it is compact and convenient to use. The cross-piece 17, the sleeve 18 and the rod 15 are fasteners, and the lugs 13 and 16 of the fixing elements of the ring 14 of dielectric material and the sleeve 18, respectively.

Improving quality and achieving stable signals by performing device in the form of an integrated unit that includes a display unit 1, the measuring electronic unit (IAB) 2 and the sensor 4, due to design decisions are not orestano sensor 4, working on the principle of a plate capacitor, due to the presence and constructive solutions ring of dielectric material.

An electronic circuit operating at a frequency of 800 Hz, is connected to the sensor gives accurate and stable measurements of dielectric permittivity without interference from external noise sources. The scale of the instrument is linear with a constant gain and is configured so that the main mass of the measured oil is in the range from 0 to 100 USD the Time of measuring the dielectric constant of the measured fluid is 3-5 with; on the scoreboard of the digital indicator shows the value corresponding to the total value of the fractional composition of the measured product. Quality compliance (compliance fractional composition of petroleum products is determined by the equality of the values of the signals measured and the reference sample. The device is sensitive to mixtures of petroleum products, such as high-octane and low-octane gasoline, to various kinds of additives blended with motor gasoline.

The claimed device can be simplified indicator control the dielectric constant of the oil. Why when the sensor device 4 is lowered into the tank, which is poured control the oil, such as gasoline A76, to the level of kwasny the holes 10 of the device. The switch 6 is put in the “MEASURE”position. The controller 7 sets on the scoreboard of the digital indicator 1 an arbitrary numerical value for the controlled product, for example 76,0 petrol A76 or 92,0 petrol AI. Further, the device used in the comparison sample and the measurement result on the scoreboard displayed the numeric indicator. The coincidence of the measured number with the previously established number will mean that you compare two identical oil fractional compositions according to the dielectric constant.

The claimed device can be made of currently available materials, such as plastic, stainless steel, metalized plastic. The device allows to measure the measure the dielectric constant, and to monitor this indicator. Experimental prototypes of the device have been tested in approved laboratory with positive results.

1. Device for measuring the dielectric constant of the dielectric environments, including elements in the form of a display unit, measuring electronic unit, sensor, controls, characterized in that the elements of the device are mechanically and electrically interconnected and are a piece in which the display unit and measuring electronic unit mounted in the same housing, the sensor is a cylindrical plate capacitor, which includes a cylindrical body having at the base of the hole for the flow of the medium, and on the side surface in the upper part of the through hole to release air inside the sensor housing is installed with a gap of a cylindrical Cup and a cylindrical rack, having at the bottom, from the inside, curly surface and in the upper part, with the outer side - emphasis, and the sensor includes a ring having in the upper part of the form cylinder, and the bottom shape of a truncated cone, and which is installed between the sensor housing and the cylindrical stand at the level of the through holes, and the lower base installed on the emphasis of the cylindrical rack, and the sensor includes a Central three-rod, mounted with a clearance with a rack connected to the lower part with a cylindrical glass and having a height different diameters forming in the upper part of the rod-rest, an insulating sleeve mounted in the upper part of the housing and mounted on the stop rod.

2. The device according to claim 1, characterized in that the emphasis cylindrical rack formed by the difference of its external diameter.

3. The device according to claim 1, characterized in that the ring of the lower base installed on the emphasis cylindrical posts.

4. Device is about according to claim 1, characterized in that the ring is made of dielectric material.

5. The device according to claim 1, characterized in that the Central rod is connected to the Cup by means of the spider.

6. The device according to claim 1, characterized in that between the lower part of the rod and the inner shaped surface of the rack has emptiness.

7. The device according to claim 1, characterized in that the diameter of the middle part of the rod in the 1.0 to 1.5 times the diameter of the upper part and in the 2.0 to 2.5 times the diameter of the bottom.