SU977931A1 - Device for measuring displacements - Google Patents

Description

(5) DEVICE FOR MEASUREMENT OF RELEASES

one

The invention relates to a measurement technique and can be used to measure displacements and temperatures in a measurement zone.

A device for measuring linear displacements containing a capacitive primary is known. transformer converter, current comparator and recorder P 3.

A disadvantage of the known device is the low measurement accuracy.

The closest to the present invention is a device for measuring displacements containing a capacitive primary transducer, an integrator whose primary circuit includes a primary transducer, a reference voltage source, a comparator, the first input of which is connected to the integrator's output, a bias voltage source connected to the wmnd the comparator input, a key connected between the integrator input

And the common wire of the device, the control input of which is connected to the output of the comparator, a trigger, a reset input. which is connected to the comparator output, the control unit, the output connected to the trigger setup input, the reference generator, the element I, the first input of which is connected to the output of the trigger, and the second to the generator output, the counter of the pulses connected to the output of the element And and the recorder connected to the pulse counter Z ..

The disadvantage of this device is the low measurement accuracy.

15 under varying ambient temperature conditions.

The purpose of the invention is to improve measurement accuracy and enhance functionality.

20

The goal is achieved by the fact that the device for the view of displacements, which contains a capacitive primary transducer, an integrator whose 3 97 feedback circuit includes a primary transducer, a reference voltage source, a comparator, the first input of which is connected to the integrator output, the source offset, connected to the second input of the comparator, a key connected between the input of the integrator and the "common wire of the device, the control input of which is connected to the output of the comparator, trigger, the reset input of which is connected Yuchen to the comparator output, control unit, output connected to the trigger input, reference generator, And element, the first input of which is connected to the trigger output, and the second to the generator output, pulse counter connected to the output of the And element, and the recorder, equipped a coding unit connected between the voltage source and the input, the integrator, the second And element, the first input of which is connected to the trigger output, the second input to the generator output, and the third inputs of the first and second And elements are connected to you control unit, the second pulse counter, whose input is connected to the output of the second element, and the output to the control input of the coding unit, and the second recorder connected at the output of the second pulse counter. The drawing shows a block diagram of the Device. The device contains a source of reference voltage 1, integrator 2, capacitive primary / 1convert; spruce 3 comparator, the first input of which is connected to the output of integrator 2, source 5 of the bias voltage, key 6 trigger 7, the reset input of which is connected to the output of the comparator, block 8 control, the reference generator 9, the first 10 and second 11 elements And, the first inputs of which are connected to the output of the trigger 7, the second to the output of the generator 9, and the third to the output of the control unit 8, the first 12 and the second 13 pulse counters included in outputs respectively ne Vågå 10 and second 11 elements AND, first and second AND registrar 15 included at the outputs of respectively the first 12 and second pulse counters 13 and coding unit 16 connected between the source 1 and the reference voltage input of the integrator 2. The device operates as follows. At zero measured movement through the fixed coefficient neper of supplying coding block 16, the signal from source 1 is fed to the input of integrator 2. In accordance with the capacitance of converter 3, which, in the absence of movement, is determined by the known initial capacity at a fixed temperature and addition of temperature change, This voltage from source 1 to the input of integrator 2 through coding block 16 is converted to a linearly increasing voltage, From the output of integrator 2, linearly increasing the voltage arrives at the input of the comparator k, where it is compared with the voltage from source 5, and at the moment of their equality at the output of the comparator, a pulse appears switching the key 6 at the input of the integrator 2, as a result of which the voltage at the output of the latter becomes linearly decreasing. Thus, at the output of the comparator, rectangular pulses are formed, the frequency of which is proportional to the capacitance value of converter 3. With the help of trigger 7 and element 11, these pulses are filled with pulses from generator 9, causing the counter 13 to be fixed. the number of pulses, depending on the capacitance of the converter 3, is proportional to the ambient temperature (since the movement is zero), the value of which is displayed by the recorder 15. At the same time, the code corresponding to the ambient temperature is fed to the control input of the coding unit 16 by changing its transmission coefficient. After this, the second measurement stage begins - measurement of displacement, which affects converter 3, changing its capacitance. As a result, the slope of the linearly increasing or decreasing voltage at the output of integrator 2 changes. Counter 12 records the number of pulses corresponding to the value of the measured displacement, the value of which is recorded by the recorder 14. The invention improves the accuracy of movement measurement by compensating for temperature errors and extends the functionality of by measuring the ambient temperature.

Claims (2)

1. Author's testimony of the USSR f 625128, cl. G 01 B 7/00, 1978. 2. March, A.I. Shin, E.K. Shakhov, V.M. Shlindin, Electrical Parameters Transducers for Monitoring and Measurement Systems. M., Energie, 1976 (prototype).