Device for getting imprints of dust traces
FIELD: measurement technology; criminology.
SUBSTANCE: main and ancillary electrodes are installed before procedure of getting imprints of dust trace. Voltage applied to main and ancillary electrodes is regulated within wide high-voltage range. Device for getting imprints of dust traces has electric charge storage, main and ancillary electrodes and connecting cable of ancillary electrode, mechanical unit driven into action by muscle force of expert. Mechanical unit is connected with mechanical energy/electric energy converter which is connected with electric charge storage. Main electrode is coated with insulating dielectric film and connected with electric charge storage.
EFFECT: improved exploitation characteristics; independence on external electric power sources; reduced chance of electric current shock.
2 cl, 2 dwg
The technical solution relates to measuring technique and can be used in forensics to detect dust footsteps on the carpet, cloth and tissues.
This device is Dust Mark Lifting Kit (DLK) E 701000 [brochure forensic unit Dust Mark Lifting Kit (DLK) E 701000] to remove fingerprints, dust marks from carpets and various tissues, which contains a source of electrical energy (battery or accumulator), the inverter low voltage in high-voltage DC power, two electrodes, a dielectric film coated on one side with a layer of aluminum, and connecting cables. The basis of this instrument is based on the principle of transfer dust trail from the carpet due to the constant electrostatic field on special film (usually black). Special film rests on the shooting mark. Over the film fits the electrode. The second electrode podsalivaetsya under the carpet under the seat of the trail. Then the electrodes receive the high DC voltage from the device DLK E 701000. When working with the specified device must ensure that the voltage of the electric power source (battery or accumulator) corresponded to the nominal value. In addition, the complicated procedure of preparing the device for use.
The closest in technical the coy nature of the proposed technical solution is the forensic device "Trace" to remove fingerprints, dust traces [Forensic device "Trace" for removing dust prints. The user guide. Scientific and technical firm IZOVAC 2002], consisting of the power source Converter high voltage, the drive of the electric charge, high voltage switch, the main and auxiliary electrodes connected to the outputs of high voltage switch using a high-voltage cables, and special film for registration of dust prints. The device operates as follows. The device is connected to a source of electrical energy (electric network or batteries), the output of the inverter turns DC voltage of a few kilovolts. This voltage is applied to the drive of the electric charge. To remove prints, you must first auxiliary electrode placed under the carpet in the place where the footprint, cover with a special film trail and to impose on it the main electrode. Both electrodes using the cable to connect to the device. After this, including the high-voltage switch to apply a high voltage to the electrodes and to stand in this position for some time recommended by the instruction manual of the device. Then turn off the high voltage switch and thereby removed from the plates by high voltage. Lifted the main electrode and seized the camping special film with a detached dust behind them. Next check track with film possible either by photography or removal using gelatin film [Criminology, edited Yablokova N.P., Moscow, 1995].
The disadvantages of the known device is the necessity of using an external source of electrical energy, lower operating characteristics of the device associated with great preparatory time of installation of the main and auxiliary electrodes before removal procedure prints a trace, no adjustments of the magnitude of the high voltage DC voltage applied to the main and auxiliary electrodes, with the possibility of defeat expert high voltage voltage applied to the bare surface of the main and auxiliary electrodes.
Solved technical problem - increasing the operational characteristics of the device by reducing the preparation time of installation of the main and auxiliary electrodes before removing the fingerprint dust traces, the possibility of regulation in a wide range of high-voltage DC voltage applied to the main and auxiliary electrodes, there is no danger of defeat high-voltage and eliminating dependence on external sources of electrical energy.
The decision of the technical tasks in the first embodiment of the technical solution is achieved by in the transfer device fingerprint dust traces, consisting of the drive of the electric charge of the main and auxiliary electrodes and the connecting cable auxiliary electrode, introduced mechanical unit, driven by the muscular effort of the expert connected with a Converter of mechanical energy into electrical energy, which is connected with the drive of the electric charge, the main electrode is covered with an insulating dielectric film and is structurally related to the storage of electric charge.
The solution of the technical problem in the second embodiment, the technical solution is achieved in that in a device for removing fingerprints, dust traces, consisting of the drive of the electric charge of the main and auxiliary electrodes and the connecting cable auxiliary electrode, introduced mechanical unit, driven by the muscular effort of the expert connected with a Converter of mechanical energy into electrical energy, which is connected with the drive of the electric charge, the main electrode is covered with an insulating dielectric film and is structurally related to the storage of electric charge. When this mechanical device, a Converter of mechanical energy into electrical energy and the drive of the electric charge structurally integrated into one unit as with the me arm, made with the possibility of connection to the main electrode by using a join node.
Figure 1 presents a diagram of the device removing fingerprints, dust traces in the first embodiment of the technical solution. Device for removing fingerprints, dust traces contains mechanical unit 1, connected to a Converter of mechanical energy into electrical energy 2, which is connected with the drive of the electric charge 3. One of the outputs of the drive electric charge 3 directly connected to the main electrode 4 and the second - through cable 5 auxiliary electrode 6. The main electrode 4 is covered with an insulating dielectric film 7 and is structurally related to the storage of electric charge 3.
Figure 2 presents a diagram of the device removing fingerprints, dust tracks on the second version of the technical solution. Device for removing fingerprints, dust traces contains mechanical unit 1, connected to a Converter of mechanical energy into electrical energy 2, which is connected with the drive of the electric charge 3. One of the outputs of the drive electric charge 3 connected to the main electrode 4 and the second - through cable 5 auxiliary electrode 6. The main electrode 4 is covered with an insulating dielectric film 7. Mechanical site 1, the Converter of mechanical energy into electrical energy 2 the drive of the electric charge 3 structurally integrated into one unit in the form of a removable crank handle - made in one body in the form of a removable handle made with the possibility of joining due to the join node 8 with the main electrode 4. The Converter of mechanical energy into electrical energy in both versions of the technical solution may be performed by any known scheme, for example on the basis of the piezoelectric transducer with mechanical site that provides pressure to the piezoelectric crystal or oscillator voltage with mechanical site providing rotation of the armature of the generator.
Consider the work of the proposed device according to the first and second options. The auxiliary electrode 6 down under the carpet the product in place of the detection of fingerprint dust trail. The auxiliary electrode 6 via the cable 5 is connected to the drive of the electric charge 3. Constructive node, which consists of mechanical site 1, the Converter of mechanical energy into electrical energy 2 and the drive of the electric charge 3 (on the second version of the technical solution), attached to the main electrode 4, which is an example of a specific implementation for the first variant of the technical solution. The main electrode 4 is put on the top of the fingerprint dust trail. After this, the examiner operates the mechanical node 1, which affects Preobrazovatel the mechanical energy into electrical energy 2, and generating electrical energy, which is supplied to the drive of the electric charge 3 and then to 4 main and auxiliary electrodes 6. The magnitude of the electric charge on the electrodes depends on the force and duration of the actuation of the mechanical node 1. Thus, being adjusted in a wide range of high-voltage DC voltage applied to the primary 4 and 6 auxiliary electrodes. Next, the main electrode 4 is removed from the carpet and its dielectric surface remains fingerprint dust trail. Check fingerprint dust trail is provided either through photography or imprint dust trail using gelatin film [Criminology, edited Yablokova N.P., Moscow, 1995].
1. Device for removing fingerprints, dust traces, consisting of the drive of the electric charge of the main and auxiliary electrodes and the connecting cable auxiliary electrode, characterized in that the introduced mechanical unit, driven by the muscular effort of the expert connected with a Converter of mechanical energy into electrical energy, which is connected with the drive of the electric charge, the main electrode is covered with an insulating dielectric film and is structurally related to the storage of electric charge.
FIELD: forming of labels to protect against forging, copying of information.
SUBSTANCE: device can also be used for direct transformation of properties of materials and production of micron and sub-micron size functional structures without using resistive masks. Device has vacuumed camera inside which accelerated electron beam source is placed with divergence angle of 20 degrees. Device also has spatial modulator and unit for registering images; both last members are placed on the way of the beam. Spatial modulator is made in form of plate provided with holes. Side walls of all the holes are provided with pair of electrodes disposed opposite to each other. One of electrode of each pair is connected with power source through common wire and the other one - through controlled commutator. Micron and sub-micron sizes of elements of images are provided as well as increase in carrying capacity of any hole, simultaneous and independent control of carrying capacity of all the holes and creation of multi-layer images without spatial modulator and means for fixing images getting used .
EFFECT: improved efficiency of operation.
11 cl, 3 dwg
FIELD: analytical chemistry.
SUBSTANCE: sensor can be used for inspecting level of oxidants and antioxidants in liquid. Device for detecting absence or presence of reduction-oxidation reactive-capable analyzed matter in water sample has electro-chemical cell with sensor chamber, first and second electrodes, hole for introducing sample into sensor chamber and reagent placed inside sensor chamber. Electro-chemical cell is designed to be removable after usage in any unique experiment. Reagent is capable of subjecting to reduction-oxidation reaction directly with analyzed matter to generate electric signal indicating absence or presence of analyzed matter. Method of detecting level of reduction-oxidation reaction-capable matter is also proposed as well as method of measurement of sulfur dioxide in sample of vine and method of producing device mentioned before.
EFFECT: improved precision.
36 cl, 4 dwg
FIELD: measuring engineering.
SUBSTANCE: method comprises applying two poles of the magnet core of a detector of vortex currents to the wall of the blade parallel to the baffles mounted behind the wall whose thickness should be measured. The poles of the pickup are provided with coils connected in series. The detector moves over the wall perpendicular to the baffles. The thickness of the wall is determined from the signal from the detector according to the preliminary calibration.
EFFECT: enhanced precision.
4 cl, 6 dwg
SUBSTANCE: method involves introducing physiologic sample into measuring instrument having electrochemical cell with working electrode and comparison electrode. The first electric potential is applied to the cell and the current flowing through the cell is measured during the first time period for determining the first time-current transition characteristic. Then, the second electric potential is applied to the cell for determining the second time-current transition characteristic. Then, preliminary concentration of the substances under study is calculated from the first and/or the second time-current transition characteristics. The preliminary concentration value with background value being subtracted is multiplied by correction coefficient for determining concentration of substance under study in the sample.
EFFECT: minimized analytical error caused by hematocrit number.
9 cl, 1 dwg
FIELD: electrical article manufacture.
SUBSTANCE: the invention is related to the quality control of the insulation of electrical articles during their manufacture, mainly when drying the articles with the hard insulation, based on the thermoreactive impregnating lacquers and compounds. The method essence consists in measuring the capacitance of the same insulation gap at two different frequencies. The frequency of 50-100 Hz is used a the low frequency, and the frequency of 10-100 kHz - as the high one. Then the humidity coefficient is determined as the ratio of the capacitance, measured at low frequency, the capacitance, measured (at high frequency. The humidity coefficient should be in the limits of 1.00-1.05.
EFFECT: increased accuracy and objectivity of the quality control.
FIELD: test equipment.
SUBSTANCE: method can be used for making method of inspection of thermo-emission condition of surface-ionization ion thermo-emitter easier. It allows conducting inspection of effectiveness, uniformity and selectivity of ionization of organic compounds on the surface of thermo-emitter during common measurement cycle without usage of test samples of organic compounds. Atmospheric pressure air is pumped close to surface of thermo-emitter at volumetric speed of (2-10) l/min. Humidity of air is put under control. Constant voltage of (30-600) V is applied between thermo-emitter and ion collector. Thermo-emitter is subject to heating at constant speed of heating. Thermo-emitter ion current temperature dependence is registered. Values are determined which characterize peaks of ion current at preset temperature dependence (position of peaks, current intensity, width of peaks, and speed of raise of peak currents). Thermo-emission condition of thermo-emitter is judged from values of received characteristics.
EFFECT: simplified procedure of inspection; elimination of test samples.
7 cl, 5 dwg
FIELD: investigating or analyzing materials.
SUBSTANCE: method comprises interrupting current that flows between the working and auxiliary electrodes of the electrochemical cell mounted in the fluid to be analyzed and measuring current potential of the working electrode with respect to the reference electrode at a given moment of time. The reference electrode is made of auxiliary electrode whose rate of discharge of the double electric layer differs from that of the working electrode. The measurements of the current potential is carried out after a lapse of time no less that the double time interval of the relaxation process after the current interruption, but less than the time period of the discharge of the double electric layer of the working and auxiliary electrodes.
EFFECT: expanded functional capabilities.
FIELD: medicine; chemical engineering.
SUBSTANCE: method involves adding 5 mole/l tartaric acid solution of pH=3.0 to bisubstituted 0.01 mole/l ammonium hydrophosphate solution. The solution is deaerated with oxygen concentration being less than 0.001% during 30 s at (-1.5) V. Electrolysis is carried out during 330 s at (-1.5) V. Gas supply is stopped and current-voltage curve is recorded at voltage scanning rate of 300 mV/s. Standard angiotensin II solution is added, stirred and electrochemical concentrating on is carried out on glass-graphite electrode during 330 s at (-1.5) V. Gas supply is stopped and current-voltage curve is recorded at voltage scanning rate of 300 mV/s. Analytical signal of angiotensin II concentration in potential range of 0.3-0.5 V relative to chlorine-silver electrode.
EFFECT: improved sensitivity and express-analysis features.
FIELD: electro-chemical analyzers for liquid and gaseous media.
SUBSTANCE: membrane solion can be used as for dense and micro-pore membrane. Device has case filled with internal solution, indicator electrode, separating membrane and tool for fixing membrane. Elastic member provided with holes is installed between separating membrane and tool for fixing membrane. Internal surface of elastic member follows external surface of indicator electrode. Diameters of holes in elastic member 200 times max exceed thickness of separating membrane. Holes in elastic member can have random shape. Sizes of holes along their minimal axes do not have to exceed thickness of separating membrane 200 times max.
EFFECT: improved reliability of operation within wider temperature range.
2 cl, 1 dwg
FIELD: identification of metal scrap from which metal or metal alloy is produced.
SUBSTANCE: method comprises steps of sorting metal scrap by groups according to their content; weighing each group; determining percentage content of elements in groups of metal scrap; determining percentage content of elements in the whole quantity of metal scrap; processing metal scrap; after processing, identifying produced metal alloy or metal and metal scrap by determining percentage content of each element in processed products; comparing results with data of percentage content for the whole quantity of metal scrap. Results are compared according to element or elements contained in metal or in metal alloy and characterized by less loss at processing. Metal scrap may be sorted to groups on base of preliminary analysis. At comparing results, losses for processing are taken into account.
EFFECT: enhanced process of identification of metal scrap from which metal or metal alloy is produced.
FIELD: inspection of hazardous matters content.
SUBSTANCE: gas analyzer can be used for inspecting presence of ammonia. Gas analyzer has measurement component content detector made in form of electro-chemical sensor provided with electrolyte consumed ding exploitation and device for detector signal processing and controlling which has in turn microcontroller with central processing unit and program memory unit. Memory element is fastened to case of detector which element is connected with central processing unit of microcontroller through interface. Processor unit provides integration of detector signal value and periodical recording of integral signal value to detector memory unit as well as reading of this value out of memory unit. Limit value of integral signal of the detector is introduced into program memory unit of microcontroller which value corresponds to service life of the detector. This value is periodically compared with current value of integral signal. Analyzer is provided with signaling unit which operates at the moment if current value of integral signal gets equal to limit value of integral signal of the detector.
EFFECT: higher quality inspection of value of integral signal.
FIELD: thermal and nuclear power stations; meter calibration in extremely pure water of condensate type and power unit feedwater.
SUBSTANCE: for pH-meter calibration ammonia whose concentration varies by 1.5 - 2 times is dosed in working medium. Electric conductivity and temperature of working-medium H-cationized sample are measured. Measurement results are processed in computer with aid of set of equations characterizing ionic equilibrium in source sample and H-cationized samples. Calculated pH value is compared with measurement results.
EFFECT: enhanced precision and reliability of meter calibration in extremely pure waters.
1 cl, 1 dwg, 1 tbl