Device to measure density of current in local volumes of solid media

FIELD: measurement equipment.

SUBSTANCE: sensor of the device represents a thick-walled tube-dowel 1, made of a dielectric plastic material, on the outer cylindrical surface of which there are current electrodes 2 and 3, split by plastic dielectric gaskets 4 and on the reverse side. The tube-dowel with electrodes is inserted into a hole 6, previously drilled in the solid medium, and is spaced in it with a screw 10 screwed into it. Gaskets 4 and 5 are installed perpendicularly in a current line 8, flowing in the solid medium. A current recorder 9 is connected between current electrodes 2 and 3. A rotary lever-indicator 11 is fixed on the upper part of the dielectric tube perpendicular to the split of the tube-dowel.

EFFECT: increased accuracy of current density measurement in local volumes of solid media.

2 cl, 1 dwg

 

The invention relates to measurement technology, in particular to devices for measuring the current density in the local volume of the solid conductive media with any direction of the current.

A device for measuring conductivity of liquid media and measuring the current density in the local volume of liquid solutions and melts, containing the sensor is in the form of a dielectric tube mounted within it two disc-shaped current electrodes, separated by an insulating strip, three ring-shaped measuring electrode, one inside the tube and two outside front inner circle and the nearest current electrode, the current Registrar and a variable resistor connected in series between the current electrodes, two similar logger voltage, respectively included between the outer electrodes and between the spaced inner electrode [1]. The device can be used for measuring conductivity of liquid media, and current density in them. When measuring the current density set up studied in the local volume of the liquid medium and is rotated so that its longitudinal axis is in the direction equitativa lines, the data logger voltage included between the outer electrodes, pok�shows the maximum value. In the found position of the sensor changes the resistance of the variable resistor establish the indications registrars voltage the same. According to the testimony of the Registrar current, taking into account the cross sections of the tube are the current density.

For use of said device in solving the problem of measuring the current density in the local volume of the solid conductive media room sensor device inside the solid body rotation and orientation of the tube along equitativa lines is not possible, eliminating the use of the device for measurements in solid media. Increased the size of the sensor is additionally burdened with the task of measuring the current in the local volumes of solids.

The closest in technical essence to the proposed device is a device for measuring current density in liquid media containing three identical measuring element [2]. Each of them comprises a dielectric tube placed in her two current disc-shaped electrodes separated by a dielectric spacer, and the Registrar current, is connected between the current electrodes. When the dielectric strip is made of plate, and the current electrodes are flush with the ends of the tubes. The dielectric tube of the measuring elements of the device are rigidly fixed� relative to each other in three mutually perpendicular planes through the non-conductive frame.

The technical result of the invention of a device for measuring the current density in the local volume of solids provides the expansion of technological capabilities, improving the accuracy and simplification of procedures for the measurement of current density in the local volume solids: simplify preparatory operations through the use of simple and reliable drilling operations not only on drills, but also a variety of portable power tools: this allows you to make measurements not only in the laboratory, but also for most of the existing facilities at the place of installation; use as a tube model, easy to manufacture, cheap, widespread construction element - anchor; the simplicity and manufacturability of the sensor device; a simple technique of preparation and carrying out measurement, high measurement accuracy by reducing the size of the sensor placed in the measuring space of the solid conductive environment.

The essence of the invention lies in the fact that the device for measuring current density in the local volume of solids containing the current Registrar, included between two current electrodes, resultsmadeleine strip, located flush with the dielectric tube, is rigidly fixed with the help of the frame, additional�but contains the second dielectric strip, current electrodes are thin sidewall, attached to the outside of the lower cylindrical part of thick-walled plastic tube plugs and cut together with the bottom part of the tube-wall plug along the axis of symmetry, contrary to the two sides of the inner side is flush with the tube, and on the external - flush with the resulting current electrodes inserted plastic dielectric strip, the tube is a slip fit dowel placed in the hole previously drilled in a solid medium using the measurement vector perpendicular to the current, as a function of the frame performs a screw, pre-screwed into the dielectric tube and arching her back in the hole, in addition, the device may further comprise a rotating arm-pointer, mounted on the upper part of the dielectric tube dowels perpendicular to its cross section.

The current density is given by:

J=I/S,A/m2,(1)

where I is the electric current according to the testimony of the Registrar current, And;

S=h×(d - a Central square section of the hole, m2;

h - distance from the lower edge of current electrodes:

- to the top edge of tocopherolacetate by full immersion of the electrodes in conductive solid medium, m;

- to the top edge of the current carrying solid media by partial immersion of the electrodes in conductive solid medium, m;

d is the hole diameter, m

Consequently, the sensor device consists of a turning Bay, representing a thick-walled plastic tube dowel, over the outer cylindrical surface of which is fixed to the bent paleobotany sheet current electrodes. The lower part of the tube dowels cut to the symmetry axis, and it is flush with the inside cylindrical surface of the tube-wall plug and the outer surface of the current electrodes inserted dielectric spacers. The electrodes are interconnected by the current Registrar and is made of a foil or plate of a thickness of 0.05-1 mm. Plate strip has a thickness of 0.5-1 mm.

In the local place conductive solid media (for example, a steel plate, which spreads the electrical current), in which it is necessary to measure the current density, a hole is drilled with a diameter of 5-10 mm. Hole provides free sliding and rotation of the Bay. For example, in the plate hole is drilled from the nearest to the studied local volume surface and passes through it so that the center of the local volume was located on the axis of symmetry of the tube-in anchors at a distance h/2 from the lower edge of the current electrode. The Bay is determined� in the hole. Through each current electrode electric current is measured by current Registrar.

When turning Bay device changes the current flowing current from one electrode through the Registrar current to the second current electrode. Fully current will flow through the current Registrar, provided that the dielectric spacers will stand perpendicular to the current. Otherwise, between the current electrodes will flow only part of the current. Measurement error increases and reaches a maximum when the direction of the dielectric strips along the vector of the current flowing through the measured local volume. In this case, between the current electrodes, the current will not leak at all.

Unlike the prototype, where the shape of the current electrodes are flat, in the proposed device the electrodes are in the form of probetec. This is due to the technological features of the receiving hole measured in solid medium. Receiving openings in the form of a recessed disk, grooves with rounded edges of a parallelepiped is technologically much more difficult than cylindrical. Create milling, slotting rarely used on specialized and expensive machines, while the cylindrical easy to create ordinary widespread drilling. It can be used not only� drilling machines, but also a variety of portable drills. This allows you to make measurements not only in the laboratory, but also for most of the existing facilities at the place of their installation.

The application of current electrodes in the form of probetec instead of a flat does not introduce significant changes in the measurement process. The area of the active section current involved in the process of measurement equal to S=h×d, m2where h is the height of the Central section that is involved in passing a current between electrodes, m, d is the hole diameter, m. the area of a rectangle is essentially equal to the width of the hole, grab the current electrode in the measurement process, multiplied by the height of the orifice.

In the preparatory period of measurement by turning bays achieve the maximization of the latching current. Then into the phone, dowel screw screw, respira her and pressing firmly against the current electrodes to the walls of the hole. The area of contact of current electrodes with the wall of the hole increases to a maximum when the contact pressure of the electrode against the wall of the hole.

Registrar current and current electrodes, has high electrical conductivity. Given the small diameter hole, a small thickness and the diameter of each of the current electrode device has little effect on the conductivity, and hence the current density in technological �the unit. This allows to achieve high measurement accuracy.

The thickness of the dielectric spacers and electrodes is reduced to a minimum, which minimizes the size of the bays and openings, the degree of their influence on the electrical conductivity and the current density in the process unit. The screw serves as a frame. He filled up the dowel in the hole, maximizing the contact of current electrodes with the wall of the hole.

The application of the second dielectric strip allows you to split the current electrodes on one side of the cylindrical outer surface of the tube-in anchors, while the first dielectric spacer separates the current electrodes on the other side.

The execution of the current electrodes in the form of a thin shell allows, first, to reduce the size of the Bay - the movable part of the sensor, consisting of a tube-in anchors, two current electrodes, two dielectric spacers and screws. Secondly, lowering the stiffness of the current electrodes while reducing the thickness of the bent plates contributes to a better fit of the current electrodes to the hole measured in solid medium.

A flat refusal from the circuits of the sensor in the form of a petal, which consists of a set of flat current electrodes separated by a flat dielectric spacer, allows the use of simpler, cost-effective way to create a hole�TIA for placing the sensor device in a local area measurement - drilling through the investigated area of the solid medium. This gave the opportunity to the movable part of the sensor - Bay to give a cylindrical shape, allowing to maximize the hole to accommodate current electrodes. Cove with a small gap occupies almost all the space of the drilled cylindrical hole.

Mount current electrodes on the outside to the bottom of the cylindrical part of thick-walled plastic tube plugs gives you the opportunity to position them in the vicinity of the wall of the hole. This allows, first, in the preparatory period of measurement to produce a search direction vector of a current and install dielectric spacers perpendicular to the current. Secondly, due to the small expansion Bay when svorachivanie screws to achieve a good fit of the current electrodes to the wall of the hole.

Pre-drilled in a solid medium using the measurement perpendicular to the vector current, allows you to place and use measured in the local volume sensor cylindrical shape.

Fabrication of the sensor device in a cylindrical shape ensures, first, the rotation and as a result the procedure for setting the position of the transducer in a solid local region on the criterion of maximizing the current flowing through the current electrodes, - install it so that the dielectric spacers located perpendicular to the measured current in the local area. Secondly, to minimize the violation of the original shape of the measurement object - conductive solid environment: in terms of customization of the device to the vector of current in the local volume with the rotation of the sensor in space, we perform the technological hole is the minimum amount.

The placement of the tube-dowel slip fit in the bore of the electrically conductive solid media allows you to prep the measuring period to rotate the sensor in a solid body. This gives you the opportunity to properly position the current electrodes measured in local area and to maximize the period of preparation of the device current. As a result of such positioning width of the section involved in the conduct of the current electrodes is known and equal to the diameter of the hole. Ultimately, this allows us to find and the current density.

Screw that functions as frame, provides the access to the measured local capacity for the fullness of the dielectric tube in the hole and establishing reliable contacts current electrodes with the surface of the hole by screwing in a dielectric tube (e.g.�, screwdriver or screwdriver).

The use of pivot arm-pointer facilitates not only the turning Bay in the hole, but also its installation. Strengthening the linkage pointer on top of the dielectric tube of the dowel allows it to function even when a significant dip tube of the dowel into the hole. Direction lever-pointer perpendicular to the slit of the tube-wall plug combines the vector direction of the current direction of the lever-pointer.

The special role of the lever-pointer performs upon subsequent refinement of the current density taking into account current component in the plane passing through the lever-pointer and the axis of symmetry of the tube-in anchors. In this case, the second measurement is carried out with the new drilling of the investigated solids. The direction of drilling is determined, including, and the pointer lever-pointer.

Thus, comparison of the claimed solutions with other technical solutions shows that the newly introduced elements are known. However, their introduction in the specified communication with other elements of the device, as well as their mutual arrangement results in the introduction of the above properties, enable measurement of the current density in any local volume of solid conductive medium in either direction of the vector current.

The drawing is a perspective view of an apparatus for and�measurement of the current density in the local volume of solids.

The device comprises a thick-walled tube plug 1 made of dielectric plastic material, the outer cylindrical surface of which strengthened the current electrodes 2 and 3, broken plastic dielectric spacers 4 and back side - 5 (Fig.1 strip 5 is not shown). Pipe-plug with electrodes inserted into the hole 6, pre drilled in a solid medium, and ruspert it wrapped with a screw 10. Strips 4 and 5 are perpendicular to the line current 8 flowing in a solid medium. Between the current electrodes 2 and 3 included 9 Registrar current. On top of the dielectric tube perpendicular to the slit of the tube-in anchors reinforced pivot arm-the pointer 11.

Dielectric pipe-dowel 1, the dielectric strips 4, 5 are made of plastic material with a low dielectric constant in the temperature range studied liquid medium. For example, at a low temperature conductive solid dielectric environment of the tube and the strip may be made of polyvinyl chloride, polystyrene, polyethylene, high temperature - PTFE.

Form tube-dowel virtually no different from the plastic anchors used in construction to fasten the screws into the drilled holes of the walls. Lower horse� tube dowels cut into 2 or more parts along the axis of symmetry of the tube. This is done to facilitate the distension of the tube in the formed hole. For the purposes of measuring current density in the low-temperature conductive solid medium as a tube-in anchors can be used for construction anchors, the outer surface of which is cylindrical, without the bumps and vibrations of the diameter. In a through slot in the bottom of the tube-plugs on both sides are inserted dielectric spacers separating the current electrodes from each other, including, in plastic sludge in the process of enlargement of the tube-wall plug in the hole. On the remaining two outer semi-cylindrical surfaces of the lower part of the tube-in anchors are fixed current electrodes.

The electrodes 2 and 3 are performed by rolling of thin plates in the form of probetec diameter d with negative tolerances that ensure free sliding of the Bay, consisting of a tube wall plug attached to it current electrodes in the drill hole. The electrodes were made of plastic material with high conductivity and low susceptibility to surface polarization. At low temperature - foil of copper, silver. At elevated temperatures of the studied environment, the electrode material must have sufficient heat resistance, and elevated aggressiveness of the environment - corrosion resistance Lieb� heat resistance. For example, from steel foil 12X18H9T, platinum.

On the border of the "current electrode - measured solid environment" at each given temperature is formed a potential difference determined by the electrochemical potential difference of the electrode material and the material of the investigated solid medium in the place of measurement. For example, copper M1 and steel St3ps. However, in the measuring circuit, made up of contact of the investigated environment - first current electrode, the first current electrode of the first current-carrying wire - recorder current of the second current-carrying wires - second current electrode - contact the second current electrode of the studied environment", the counter circuit includes two identical potential difference. They cancel out and the measurement results are almost not affected.

Electrodes with current leads on the tube-the dowels are fixed, e.g. by gluing, soldering. Well established welding-soldering when soldering a current electrode is heated, bringing the plastic tube plugs until soft (polyethylene - 200-215°C). Thus there is a welding-sealing of printed electrode to the surface of the tube-in anchors. The surface of each electrode before welding-soldering should be degreased in the known solutions.

The hole in the solid conductive medium is obtained by drilling. To reduce the roughness �poverhnosti holes and improving the adjoining current electrodes to the surface of the hole is used sinking, honing, grinding etc methods.

As the frame is steel the screws. The diameter and the cutting pitch of the screw depends on the diameter of the tube-in anchors. Thus, when the tube diameter of 6 mm dowels used a screw with a diameter of 3 mm. Screw is screwed into the Bay during the preparatory period of measurement. After the reading of the Registrar he turned and frees the Bay from close ties with the hole. The Bay is removed freely. The ability to re-use the same Bay for the next measurement should be determined by the results of checking its integrity.

In the case of the manufacture of the lever-pointer made of plastic (polyvinyl chloride, polyethylene, etc.) it is attached to the tube-dowel welding. When you run it from the metal mount on the tube-the dowel can be performed using the ties on the base of the tube-in anchors.

The provider type of the current is determined by technological factors and depends on the type, polarity, expected diapazone of change of current, the required accuracy of measurement, etc.

The device operates as follows.

Define the location of the local volume of the solid environment in which to make measurements. Is estimated the approximate direction of the vector current in the local volume. Assess the feasibility (including security implications) drilling in this l�local volume. Subject to availability, is drilling holes through the specified local volume perpendicular to the expected direction of the vector current in this volume. Drilling is made possible from the nearest solid surface. Local volume must be drilled through overrun with l2=3S and by cutting l1=d/2·tg φ, where S is the drill feed, mm/Rev., φ is the half angle at the top of the drill, φ≈59°.

Measure the dimensions and position of the current electrodes on the tube-the dowel. The sensor is inserted into the hole - investigated local solid volume environment. In terms of the flow of electric current through the local amount of rotation of the tube-in anchors achieve the maximization of the current measured by current Registrar. Wrapped screw, arching up a dowel. Counted the final reading of registrars current. In the case of incomplete immersion of the sensor measured in a solid medium are measured the dimensions of the non-immersed part of the current electrodes. Is calculated, h is the distance from the lower edge of current electrodes:

- to upper edge of current electrodes in the complete immersion of the electrodes in conductive solid medium, m;

- to the top edge of the current carrying solid media by partial immersion of the electrodes in conductive solid medium, m.

The current density is given by (1).

Poslenarkoznogo number of repetitions of the measurements and provide the required statistics of the measurements, the decision of whether to continue the hole. If necessary, it is eliminated. For this purpose, various known methods of recovery: welding, soldering, zaccarian, etc.

To clarify the unmeasured part of the current flowing in the plane And coinciding with the direction of the lever-pointer and passing through the axis of symmetry of the tube-in anchors, conducted another similar dimension in the plane A. what is near with the studied local volume drilled another hole perpendicular to the plane A, and the measurement is repeated.

In this case, the total current density in the investigated local region is given by:

J=J12+J22,A/m2,(2)

where J1is the current density in the first measurement, A/m2;

J2is the current density in the second dimension, A/m2.

It should be noted that when measured in two planes of measurement accuracy practically independent of the accuracy of the direction of the first drilling. In the absence before drilling the first hole guarantees the correctness of the estimation of the direction vector of a current � local volume appropriate to the conduct of the study in two planes. In this case, the appropriate location of the two holes on either side measured from the center of the local volume at a distance of 1-2 d, where d is the diameter of each hole. Moreover, smaller values correspond to less recommended hole diameter.

Metrological characteristics of the device was checked by repeated measurement of the current density flowing through a steel plate with a length of 100 mm, a width of 25 mm and a height of 25 mm from the welding rectifier VDU-1201 complete with ballast rheostats RB-301. The current electrodes are made of copper foil with a thickness of 0.3 mm, which ensured stable operation of the device at a constant current to the Registrar before 1 A.

30 measurements were calculated actual average current density in the plate Jpthat was compared with results of 30 measurements of current density of device Jy.

Absolute measurement error amounted Δu=Jy-Jp=0,220·10-6-0,217·10-6=0,007·10-6A/m2. The relative error was δ=(Δ/Jy)·100%=(0,007·10-6/0,220·10-6)·100%=3,18%.

As an example, considered the use of the device for assessing the degree and character of spreading of stray currents in the ship's hull. The results of the use of the device confirmed its operability in a wide range of variation of the current density. In this� case, it is recommended as a Registrar, current use of multirange ammeter.

The proposed device allows measurement of the current density in the conductive solid media in either direction of the current in a wide range of products.

Sources of information

1. RF patent №2007707, priority of 27.01.1992, CL G01N 27/07, G01R 27/22 IPC6"Device for measuring the specific conductivity and current density".

2. RF patent №2055353, priority from 01.02.1993, CL G01N 27/07 IPC6"Device for measuring current density in liquid media" - the prototype.

1. A device for measuring the current density in the local volume of solids containing the current Registrar, included between two current electrodes separated by a dielectric spacer, located flush with the dielectric tube, is rigidly fixed with the help of the frame, characterized in that it further comprises a second dielectric spacer, the current electrodes are thin sidewall, attached to the outside of the lower cylindrical part of thick-walled plastic tube plugs and cut together with the bottom part of the tube-wall plug along the axis of symmetry, contrary to the two sides of the inner side is flush with the tube, and on the external - flush with the resulting current electrodes inserted plastic dielectric strip, the tube is a slip fit dowel placed in the hole, pre-p�swellendam in a solid medium using the measurement vector perpendicular to the current, and function of the skeleton performs a screw, pre-screwed into the dielectric tube and arching it in the hole.

2. The device according to claim 1, characterized in that it further comprises a pivot arm is a pointer fixed to the upper part of the dielectric tube dowels perpendicular to its cut,
the current density is given by:
J=I/S, A/m2
where I is the electric current according to the testimony of the Registrar current, A;
S=h×(d - a Central square section of the hole, m2;
h - distance from the lower edge of current electrodes:
- to upper edge of current electrodes in the complete immersion of the electrodes in conductive solid medium, m;
- to the top edge of the current carrying solid media by partial immersion of the electrodes in conductive solid medium, m;
d is the hole diameter, m.



 

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1 cl, 1 dwg, 1 tbl

FIELD: mechanical engineering.

SUBSTANCE: device has housing provided with three cylinders made of a dielectric material. The housing receives the cylinder with a piston.

EFFECT: improved design.

5 dwg

FIELD: agriculture and soil science; evaluating water-physics properties of soils.

SUBSTANCE: porous probe communicating with water-filled tank is driven into soil, cathode is inserted in probe and anode, in soil. Voltage is applied to electrodes from dc power supply and soil moisture potential preventing water transfer from tank to soil is determined by measuring current between them.

EFFECT: reduced single measurement time due to eliminating escape of significant amount of water from measuring instrument.

1 cl, 1 ex

FIELD: investigating or analyzing materials.

SUBSTANCE: device comprises measuring section made of dielectric pipe whose inner diameter is equal to the inner diameter of the pipeline, two electrodes which form a capacitor made of segments of the dielectric pipe, mounted diametrically opposite, and connected with the electronic unit. The electronic unit has a self-excited oscillator whose frequency-generating circuit includes the capacitor and device for processing frequencies with the indicator. The electrodes are arranged inside the dielectric pipe of the measuring section. The transverse length of each electrode can be greater than half inner diameter of the pipeline. The longitudinal length of each electrode may not exceed half length of the dielectric pipe.

EFFECT: enhanced sensitivity.

2 cl, 1 dwg

FIELD: analytical methods.

SUBSTANCE: electrodes of piezoelectric resonator are modified with menthol phenyl salicylate vaseline oil, recommended solvent being toluene, modifier film weight 5-20 μg, drying temperature 20-35°C, and drying time 40-48 h. The following gains in aromatic amine determination sensitivity are thus obtained: for aniline, from 282 to 368 Hz-m3/g; for o-tolidine, from 68 to 78 Hz-m3/g; for 9-nitroaniline, from 136 to 125 Hz-m3/g. Reductions in relative deviation are, respectively, 6.0 to 3.2%, 7.0 to 3.6%, and 6.0 to 4.3%, sensor response time is decreased by 5 times, regeneration time is decreased by 24 times, and aniline detection threshold is lowered from 0.84 to 0.11 Δ, g/m3.

EFFECT: increased sensitivity and accuracy of determination.

1 dwg, 2 tbl, 11 ex

FIELD: scanning probe microscopy.

SUBSTANCE: scanning probe microscope has sample holder, first platform, onto which case is mounted, and piezoscanner. Elastic membrane is placed between case and piezoscanner. There is unit for preliminary bringing sample and probe together, as well as housing and probe fixer. The second platform is introduced into the scanner, onto which unit for preliminary bringing sample and probe together. Base and sample holder is put together with cup by means of first hole and the second hole. Second hole is connected with inert gas source. Cup is made of chemically-proof material. Case is made to be air-proof. Locker of the probe is fastened to piezoscanner. Housing is mounted onto cup for interaction with airtight case. Aerostatic plain bearing is formed between housing and airtight case. Sample holder, cup, housing, airtight case, elastic membrane and probe locker form all together closed cavity of electrochemical cell.

EFFECT: simplified exploitation; widened operational abilities.

11 cl, 7 dwg

FIELD: measurement technology.

SUBSTANCE: detector can be used in concentration meters as positive and negative aeroiones. Aeroion concentration detector has bias voltage source and receiving probe. Detector additionally has two resistors connected in series, auxiliary electrode and electrometer for measuring output voltage that is proportional to measured concentration of aeroiones. Receiving probe has to be volumetric electrode made of metal grid inside which the auxiliary electrode is located. The latter is isolated from volumetric electrode.

EFFECT: improved functional abilities.

1 dwg

FIELD: mining industry.

SUBSTANCE: method includes mounting a sample between panels of capacitor converter of electromagnetic radiation, deforming thereof in loading device. Loading device has oppositely mounted in metallic body of loading device metallic rods, force detector and registration system. Compressing external force is applied to sample from first metallic rod through force detector body and it is destroyed due to reaction force of conic indenter of second metallic rod. Metallic body of loading device is a first plate of capacitor converter, second plate - second metallic rod, mounted in bushing of dielectric material, placed in metallic body. Stand has screen, frame, capacitor converter, loading device, force detector and registration system. Between ends of metallic rods force detector and sample are positioned. Second metallic rod is provided with conic indenter.

EFFECT: higher efficiency.

2 cl, 2 dwg

Antioxidant sensor // 2263904

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: 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

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