SU637699A2 - Gas-discharge sensor for measuring linear values - Google Patents

Description

The invention is related to the means of rhoiripoiu dimensions of the size according to the parameters of the corona, discharge and can be used to measure the diameter of the kg AcPrrpObOriQKH.

A device for measuring gliamotra, an axle sheath, containing a corona discharge and interchangeable standards} 1, e are shaped wires placed in a common chamber with a measuring wire.

W.

The etaponge of the wire is reinforced in the holders by means of the established Tia Opp Dggsky with a radially reinforced leN1PLMN along its oKpjTiciiocTH different axes .ro. Ntgagpl. When the disk is rotated, measure the corresponding chamber.

This device has the following neo-essatck

I-object object, i.e., coronaer, up wire, doesn’t; 1 directly in r, break, and current of corona discharge, In the case of grounded wire

under production conditions, the measurement of the corona discharge current is carried out in the high-voltage part of the gas discharge chamber, which leads to a sharp decrease in the measurement accuracy and to a considerable complication of the measuring circuit;

During the drawing process, significant transverse movements and sharp fluctuations of the measured wire in the

the discharge chamber, which leads to a large instability of the value of the current of the corona discharge, the magnitude of which determines the average diameter of the corona wire;

Claims (1)

To increase the sensitivity of the measurement and the widening of the range, an unjustified increase in the supply voltage is required, which leads to vibration and breakage of the measured wire due to the influence of electrostatic forces on it. With an increase in the supply voltage, the requirements for electrical insulation of individual components of the device also increase. According to the main author. St. No. 300748 is known for a gas discharge sensor for measuring linear quantities, which contains a high voltage source, electrodes for measuring KopoiiHoro discharge, and an electronic current shadikator for this discharge, an additional electrode in the form of a grid, grounded through the current shadikator and located in the zone of corona discharge with However, this device cannot be used to measure the diameter of a microwire, whose position in the measurement zone is neo Probably due to significant wire oscillations in the anti-drop process, it has low accuracy and measurement sensitivity, since the object being measured is located outside the zone of the corona discharge and weighs by the magnitude of the corona current indirectly. Expansion of the range is achieved by considerable difficulties: the complexity of the design of the date, the increase in its linear dimensions and the increase in the value of the demand for lightning. The aim of the invention is to improve the accuracy of measuring the diameter of the microwire. This is achieved by the fact that in the proposed device an additional electrode is made in the form of a group of electrically conducting strings connected between them, arranged in parallel and symmetrically with respect to the controlled microwire. FIG. 1 is a block diagram of a sensor being sent; in fig. 2 —cr1s of the dependence of the current of the additional electrode on the diameter of the measured wire. D. contains a high voltage source 1, to which an external electrode 2 of the sensor is connected, covering the measured wire 3, and an additional electrode 4B in the form of two electrically conducting strings. To the additional electrode 4, the ballast resistance S and the current indicator 6 are connected in series, and, instead of the ballast resistance 5, a source 7 of the reference voltage can be connected. All sensor elements are located on the insulation stand 8. When a sufficiently high voltage is applied to the external electrode 2 on the internal electrodes of the sensor (measured wire, microelectrodes), a corona discharge occurs, and this component is through an additional electrode 4, is detected by a current indicator 6. This current is significantly dependent on the diameter of the wire to be measured, which is short-circuited in time with the microwires, and is located symmetrically and parallel to it. Curves of the largest current I corona discharge from the diameter d of the measured wire are removed for the gas discharge sensor with the following parameters: the supply voltage of 5.5 kV, the external electrode is plane-parallel, the distance of the planes is 10 mm, their width 20 mm, the distance between the measured wire and microwireKidmi (additional electrode) is 2 mm, the diameter of the microwire is 83 microns, the ballast resistance Re O; 3, O; 6.0; 9.0 MΩ The design of the sensor and its geometrical parameters are optimal for practical measurements of the diameter of microwires in the range from 10 to 1 µm. When choosing an additional electrode, the number and form of microelectrodes (shchara, tip, wire, etc.) play not the most important role, and here it is fundamental that the microelectrodes, providing a stationary corona discharge, are located near and symmetrically with respect to the measured wire. It follows from the curves given that with an increase in the value of the ballast resistance, the measuring range of the diameter of the wire expands and is obtained; its dependencies have a more vigorous character. The sensitivity of the sensor to the diameter of the wire in the range from 10 to 2 O μm to ™ ranges from 0.62 μA / μm to 2 μA / μm, depending on the value of 1 ballast resistance. In the range of 30-40 µm, the sensor sensitivity is respectively 0.5; 1.25 μA / μm. The size of the sensor's insensitivity zone to the position of the wire to be measured is of the order of ± 5 mm. The tests of the laboratory model of the gas discharge sensor show that the proposed sensor has a high accuracy of measurement (± OD μm), reproducibility, and operation accuracy. The invention of the gas discharge sensor for measuring linear values according to the ed. St. No. 300748, dated by the fact that, with