SU1744437A1 - Device for measurement of vapor-gas shell thickness - Google Patents

Abstract

The invention relates to a measuring technique and can be used to measure the thickness of the vapor-gas shell. The aim of the invention is to improve the accuracy and performance of measurements. Using a metering device 6 for coarse adjustment of the electrolyte level, the level of electrolyte 8 in the auxiliary bath 4 is adjusted until an electrical discharge occurs between the electrode 12 and the electrolyte surface in the working bath 3. After the discharge is stopped, the electrolyte level is adjusted using the metering unit 7 until the electrolyte contacts the electrode 12. The moment of contact is determined by the occurrence of an electric current in the circuit of a low voltage source 15 of a voltage. The current is fixed using an ammeter 13. 1 Il.

Description

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The invention relates to a measuring and control technique and can be used to measure the thickness of a vapor-gas envelope.

A device for measuring the thickness of the vapor-gas membrane is known, which contains a bath with two electrodes located in it, connected to a source of direct current voltage, and a high-speed film or camera located outside the bath.

The known device does not provide sufficient measurement accuracy due to optical distortion at the boundary of the electrolyte-transparent wall of the bath - air. Complicated and expensive additional equipment is necessary for its operation, and the measurements themselves are very labor intensive.

It is also known a device for measuring the thickness of a vapor-gas sheath containing a working bath filled with electrolyte and connected to a tank-thermostat, with two electrodes located in it connected to a direct current source with a probe connected to an micrometer screw through an oscilloscope. .

This device has a low measurement accuracy due to the use of a probe that distorts the structure of the vapor-gas envelope and a micrometer screw with a divide value of 0.01 mm, as well as due to the continuous change in the physical characteristics of the electrolyte in the near-electrode zone.

The disadvantage of the device is its cumbersome and significant measurement complexity.

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The aim of the invention is to improve the accuracy and performance of measurements.

The invention is illustrated in the drawing, which shows a diagram of the device.

A device for measuring the thickness of the vapor-gas envelope contains a thermostat tank 1 (its heating, cooling elements and automation equipment are not shown conventionally), filled with a thermostatic liquid 2, inside of which a working bath 3 and an auxiliary bath 4 are placed, interconnected by a nozzle 5 and made in the form of communicating vessels, with electrolyte dispensers 6 placed above the auxiliary bath for coarse and 7 precise adjustments of the electrolyte level 8. At the bottom of the working bath 3 an electrode 9 is connected to one they poles of the source 10 voltage DC, is connected in parallel a voltmeter 11 to control the voltage. The second electrode 12. the lower part of which is made, for example, in the form of a sharp-pointed needle, is located above the surface of the electrolyte 8 in the working bath 3.

Between the two electrodes 9 and 12 there is a circuit of a series-connected ammeter 13, a switch 14 and a low-voltage constant-voltage source 15, having a voltage of, for example, 1.5 ... 12 V. A capacitor 16 of one of the plates is connected to the electrode 9, located at the bottom of the working bath 3, and to one of the poles of the source 10 of the DC voltage, and a second plate to the input of the switch 17, the first output of which is connected to the second pole of the source 10 of the DC voltage. The second output of the switch 17 is connected to the electrode 12 located above the surface of the electrolyte in the working bath 3 and connected between the two electrodes of the circuit.

The device works as follows

The thermostate 1 tank is filled with a thermostatic liquid 2. for example, water. Calibration of electrolyte dispensers b and 7 is performed, based on the ratio

I

where I is the distance between the strokes on the scale of the dispenser, mm c is the division value of the scale of the dispenser, µm; Si is the total area of the living section of the working and auxiliary

baths; mm2; $ 2 is the area of the live cross section of the dispenser, mm.

Electrolyte 8 is poured into the auxiliary bath 4, which through the nozzle 5 enters the working bath 3 until the distance between the electrode 12 and the electrolyte surface 8 in the working bath 3 becomes 1.5 ... 3 mm. The thermostat tank 1 is put in the key and the electrolyte is thermostatically controlled.

0 Switch 17 connects to source 10 of direct current voltage 10 and capacitor 16 and charges its voltage 200 ... 400. B, at which the thickness of the vapor – gas shell is measured, is controlled

5 with its voltmeter 11. After charging the capacitor 16, it is connected by switch 17 to electrode 12. With a dispenser 6, to roughly adjust the level, the electrolyte is introduced into the auxiliary bath 4 and lifted

0 level in the auxiliary bath 4 and the working bath 3 before the occurrence of an electrical discharge between the electrode 12 and the electrolyte 8 in the working bath 3.

After the cessation of the discharge by the switch 17, the capacitor 16 is disconnected from the electrode 12, to which the low voltage source 15 is connected to the switch 14. Using the dispenser 7 smoothly raise the level of electrolyte in the working

Bath 3 to the touch with the electrode 12, after noting the level of electrolyte on the scale of the dispenser /. The moment of contact is determined by the occurrence of an electric current in the circuit of a low-voltage source 15

5 voltage, which is controlled by an ammeter 13. The thickness of the vapor-gas gap is determined on the scale of the electrolyte dispenser 7.

The advantages of the device for measuring the thickness of the vapor-gas envelope in comparison with the prototype and other known devices are as follows.

Significantly (more than 100 times) increases the accuracy of measurements, significantly

5, the measurement technique is simplified and their labor intensity is reduced, the device dimensions and power consumption are reduced (by more than 2 times). In addition, the device allows to measure the thickness

0 vapor-gas shell, characteristic of a single electrical discharge with fixed values of the physical characteristics of the electrolyte.

Claims (1)

Invention Formula five A device for measuring the thickness of the vapor-gas sheath, containing a thermostat tank, an electrolyte bath in it, two electrodes, the first of which is placed in the electrolyte bath bath, the second - above the surface of the electrolyte, DC voltage source, characterized in that, in order to improve the accuracy and performance of measurements, it is equipped with an auxiliary bath, placed in the tank thermostat, with metering devices for coarse and precise adjustment of the electrolyte level bath, a capacitor, one of the plates of which is connected to the first electrode and one of the poles of the source a nick voltage, a switch whose input is connected to the second capacitor plate, a first output to the second pole of a source of DC voltage, a second to a second electrode, connected between two electrodes, from a series-connected low-voltage DC source , switch and ammeter, and working and auxiliary baths are made in the form of communicating vessels.