RU1816962C - Device for measuring displacements - Google Patents

Abstract

The invention relates to a measurement technique. The purpose of the invention is to increase the accuracy of a device for measuring displacements by increasing its sensitivity. The device comprises an inductive displacement sensor with working and compensation windings located on an open magnetic circuit and connected at their ends. An ac power supply unit as well as inputs of a differential amplifier are connected to the beginnings of these windings through adjustable resistors. A phaeo-moving unit is connected to the connection point of the first resistor and the compensation winding, to the output of which a scaling link and an adder are connected. A connection point of the second resistor and the working winding is connected to the second input of the adder. The output signal is the phase difference of the signals received at the outputs of the differential amplifier and adder. 1 ill.

Description

The invention relates to a measurement technique and can be used to measure the movements of objects. ;

The purpose of the invention is to improve the accuracy of displacement measurements.

The drawing shows a block diagram of a device for measuring displacement.

This device comprises an AC power supply unit 1, an inductive displacement sensor 2 (sensing element) made in the form of a working winding 6 and a compensation winding 7 located on an open magnetic circuit, with successive resistors 14.13 and an adder 8 connected in series with them.

To the connection point of the resistor 14c with compensation winding 7, a first input of a differential amplifier (adder) is connected. The second input of the adder 8 is connected to the connection point of the resistor 13c with the working winding 6. The free terminals of the resistors 14 and 13 are connected to the output of the power unit 1. A zero potential bus is connected to the common connection point of the working 6 and compensation 7 windings. It is also connected to the common terminals of the power supply unit 1 of the differential adder (elements 26 and 27). Phase-shifting unit 9 is made in the form of two series-connected, phase-shifting circuits of type RC (elements 15 - 18), to the output of which a scaling link 10, made

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according to the scheme of a non-inverting amplifier (voltage e-version Up (X) in phase by 180 °, and

cops 19-21). phase shift between UK voltage and InK output of the scaling link with 10 inverted operating voltage Up

connected the first input of the adder 11, (X) is determined by the expression

performed on an operational amplifier 5180 ° -,

(elements 22 - 25), the second input of the adder Voltage UK and Up (X), shifted by

11 is connected to the junction point of the rez-phase by an angle of,, geometrically summarize the side 13c with the working winding 6, the input phase-s on the differential amplifier-sum of the moving unit 9 is connected to the point 8, from the output of which is removed

connection of resistor 14 with compensation - Total voltage C # with variable

winding 7. The output signal is the phase of the FSH. and displacement functions X.

The difference in phase is thus the same. the value and direction of the vector changing in the function Up (X) in the function of the movement of the movement of X between the output signals

the sum of the differential amplifier 15 of the total voltage C-j, i.e. is changing

adder 8 1) and output

TS4 of the adder 11. Inductive sensor 2 per-Simultaneously, using phase shifting, it contains the sinusoidal voltage of the magnetic housing 12 located in the ferroelectric unit 9, open ferro-U at the connection point of the resistor, the M-co-magnetic core 5, on which the 20KOi 7 are phase-shifted the working 6 and compensation sides of the lead relative to the winding vector 7 are located at an angle. The voltage Up (X) by changing the compensation half of the resistance sensors 15, 18 of the unit is located at an unchanged distance9. At the output of block 9, a compensation measure 3 is formed at the same time. And the working measure is a UKI sinusoidal signal, which, after 4, is mounted with the ability to move the scaling link 10 (elements 19 - x21), is received at the first input (Bx.1). The device operates as follows - j 1 (elements 22 - 25). and a sinusoidal input to the second input of the zo-. (Input 2) of the adder 11 - The sinusoidal supply voltage from the sieve network Up (X) from the point of connection of the output of the voltage unit of the alternating toaster 13 with the winding 6. At the adder 11 ke, having a small internal resistance, a geometrical addition of blueing occurs, through the resistors 14,13 the social signals U and Up (X) arrive. As a result of working 6 and compensation 7 windings of the 8th. 2 of the adder 11, a sensor 2 is formed. When the worker moves, the second total voltage C, vector p 4. For example, the inductance rotates in the opposite direction to increase the ezo-voltage; and in the same direction with respect to rotation, the inductive and total resistance of the working voltage vector Ц ". As a result of one winding 6 of the sensor. Since the power supply unit for the temporary rotation of the two sum vectors has a small internal resistance, the signals U сигналов1 and Ug2 are different, then with a decrease in the impedance of the directions, the phase difference of the winding 6 decreases the voltage amplitude - s, ı1 c. Ex2 between them changes the UP (X) taken from the connection point C with double speed. Since the range of the resistor 13 with the winding 6, according to the law, the changes in the phase difference between these are close to exponential. “5x signals are 2 times larger, the device is connected between the compensation voltage by a voltage twice as sensitive by the UK. removed from the connection point by the conversion resistance in comparison with the stator 14 and the compensation winding 7, and the prototype device, and hence the working voltage Up (X), by changing the increased measurement accuracy, changed the resistance values of the resistor 13,

set the phase angle of more than 0 °, Increasing the linearity of the output hano less than 10 (in the direction ahead of the vector characteristics of the device is provided

NEPR ur (X) relative to the on-by-vector by choosing the necessary shift angles

sp. uk). For example, UP (X) and UK. out of phases "), between signals UK and Up (X),

varying in the movement function X, 55UK, and using resistors 13, 14i

arrive respectively on the direct and in-phase-shifting unit 9. respectively

versioned inputs of the adder 8. (by changing the resistance value

At the inverse input of the differential-elements 15,18) and change with

Go-amplifier 8 is produced scaling link 10 and resistors

20, 21, respectively, the amplitudes of the UK and UK signals so that the sigUKiUK “catches ..I / l and ttt-hl ratios are equal to unityUp (К) Up (К)

at the point corresponding to the end of the measuring range.

Claims (1)

SUMMARY OF THE INVENTION A device for measuring displacement, comprising an inductive displacement sensor with compensation and working windings, which are connected to each other by their ends, an AC power supply connected to the beginnings of these windings, respectively, through the first and second resistors, and a differential amplifier, to the direct input of which the beginning of the compensation winding is connected, and to the inverse input, the beginning of the working winding, characterized in that, in order to increase accuracy, it is equipped with a phase-shifting unit connected in series, a scaling unit and an adder, the phase-shifting unit is made in the form of two R-C circuits connected in series, the scaling unit is made according to a non-inverting circuit the amplifier, and the adder is based on the operational amplifier, the input of the phase-shifting unit is connected to the connection point of the first resistor with the compensation winding, the second adder input is connected to the point the second resistor is connected to the working winding, and the outputs of the device are the outputs of the differential amplifier and adder. burn Editor JZ2 Compiled Tehred M. Morgenthal Order 1717 Circulation Subscribed VNIIIPI of the State Committee for Inventions and Discover at the USSR State Committee for Science and Technology 113035, Moscow, Zh-35, Rauska nab., 4/5 and& Proofreader N. Gunko