SU90276A1 - Device for measuring the relative resistance change of resistance sensors - Google Patents

Description

It is proposed to improve the sensitivity of the device to measure the relative change in the resistance of the sensors by the X-ray method with the Whitstoi bridge, in which, for the purpose of noBiiinieHiui measurement accuracy, feedback was adopted.

Known such devices, in which mechanical feedback is applied, are relatively complex and do not provide the required accuracy.

Simplification of the device and even the most precise increase in its accuracy is achieved by embedding the magnetic feedback. Based on the property of the BHCNtyTa to change its resistance, 1 to the electric current when 1g of the type of magnetic flux penetrates it.

The drawing shows the electrical layout of the device.

The elements of the magnet feedback are a W-shaped core / with a winding of magnetically double 2. In the air; . As D; Vuh other shoulders of the bridge included sensors against Shadow. 6 and 7. The relative variability of the KOTOJ HX should be, tits. jMocT is connected with the winding of a 8 n 9 W-shaped core magnetism with the aid of a monitry amplifier Y. The compensation factor is determined on a scale of meter //. 11th bridge is connected to terminals 12.

The bridge is balanced and in io case, if the resistances of sensors 6 and 7 are not 1z, the amperity of the windings of the compensation winding 8 and 9 of the ravia of the switch and the winding 2 are applied to the winding 2;: - ;: When disassembling the bridge, the bridge is inserted by the power amplifier, and the voltage is applied to the windings of the compensating nodes. 8 n 9, which gives rise to the appearance of amber turns of memory-. nn generated by these windings. In this case, in the outermost core of the core / there is a decrease in the magnetic flux, and in the other - an increase. This measurement of magnetic flux leads to a change in the value of the ohmic resistance of bismuth spirals 4 and 5 and, consequently, to an increase in the voltage at the input of the power amplifier. that, in its own way: 1, b leads to an increase in sensitivity and measurement accuracy.

PRIORITY AREA

1. A device for measuring the relative change in the resistance of the resistance sensors according to the method of compensation with the Untston bridge, which is K) n; This is due to the fact that, in order to improve the accuracy of measurements, magnetic feedback has been applied, based on the property of bismuth to change its resistance to electric current when the magnitude of the penetrating-magnetic flux penetrates it.

2. The form of the device according to n. 1, characterized in that the balance resistances of the bridge, made of bismuth spirals, are placed in the air gaps formed by the extreme rods of the V-shaped core, in which the magnetic flow changes. When the current is unbalanced, it interacts with the flux formed by the bias current in the winding of the middle core of the core.

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