SU1551969A1 - Device for measuring linear displacements - Google Patents

Abstract

The invention relates to a measurement technique and can be used in mechanical engineering for measuring linear displacements and controlling the linear dimensions of objects. The aim of the invention is to improve the accuracy. The device contains a differential inductive sensor, the midpoint of which is connected to the output of the measuring generator of amplitude stabilization, made according to the three-point capacitive scheme and a capacitive divider. The arms of the inductive sensor are alternately connected to the common busbar via keys controlled by a phase trigger. An inductive sensor arm and a capacitive divider create an oscillating circuit for a measuring generator assembled according to a three-point capacitive circuit with amplitude stabilization. The frequency difference of the measuring generator, corresponding to the difference in inductances of the shoulders and proportional to the measured movement, is recorded by a circuit connected to the output of the measuring generator and containing two RS flip-flops, a clock generator, a third key, a prohibition circuit, a multiplexer, two counters, a register and an indicator. 1 il.

Description

the shoulders of the differential inductive sensor 1 and the common busbar, and to the first and second inputs of the multiplexer 9, the inverse output of the T-trigger 5 phase also connected to the input of the inhibit circuit 10. The output of the blocking trigger 6 is connected to the control inputs of the inhibit circuit 10 and the third key 11, the signal input of the third key 11 is connected to the clock generator 12. The output of the third key 11 is connected to the T input of the reversing counter 13 of the code, and the output of the inhibit circuit 10 is R-input of the counter 13 code, with the C-input of the display 14, the output of which is connected to the indicator 15, and with the R-input of the RS flip-flop 16 characters, the output of which is connected to the control A-input of the multiplexer 9 and the DI-input of the register 14 indications. The output of the multiplexer 9 is connected to the control A-input of the counter 13 of the code, the D-output of which is connected to the corresponding input of the register 14 of the display, and the output of 0: - to the S-input of the PS-flip-flop) 6 characters.

The device works as follows.

The measuring generator 2, connected to one of the arms of the differential inductive sensor 1, operates continuously. The signals from the output of the measuring generator 2 (the connection to which does not affect its operation) are processed by Schmidt trigger 3 and recalculated by a period counter 4, which switches the trigger 5 phases. In the first phase (trigger 5 in state 1) to the common bus via key 7 the right shoulder of the sensor I is closed, while the key 7 remains open. The inductive sensor arm I and the capacitive divider of the generator 2 create an oscillating circuit for the measuring generator 2 assembled according to the capacitive three-point scheme. In the second phase, the left shoulder of the sensor is connected to the common bus. The difference between the frequencies of the measuring generator 2, corresponding to the difference in inductances of the arms of the measuring generator 2, is proportional to the measured displacement and is recorded by a subsequent circuit.

In the first phase, the trigger 5 Phases through the multiplexer 9 sets the reversible counter 13 code in the following mode

five

0

five

0

five

40

45

50

and pulses from the clock gene | The controller 12 stabilized by a quartz resonator is passed through the third key 11 and recalculated by the counter 13. During the first n periods of operation of the measuring generator 2 in this phase, the third key 1J is blocked by the locking trigger 6 to exclude measurements during the establishment of the oscillation amplitude of the measuring generator 2 in the beginning of the phase. For stable operation of the measuring generator 2, its oscillation amplitude must be kept constant.

In the second measurement phase, the trigger 5 phases through multiplexer 9 transfers the code counter 13 to the subtraction mode, and by the end of this measurement phase it contains a difference result proportional to the displacement measured. At the beginning of the first phase of the next measurement, the result of the previous measurement is transmitted to the display register 14 by a command from the output of the inhibit circuit 10, and the code counter 13 and the trigger 16 characters are reset to their original state.

If the number of pulses of the clock generator in the second phase of measurement exceeds the number of pulses in the first (negative displacement amount), then the pulse that occurred at the output is borrowed: About a code 13 counter, flips the trigger 16 characters to state 1 and the A-input control the multiplexer 9 connects the inverse output of the trigger 5 phases to the counter 13 of the code, i.e. switches the code counter 13 to the summation mode. In this case, the magnitude of the negative displacement is measured in the forward code, and not in the additional one. The state of the counter 13 of the code and the trigger 16 characters is rewritten into the display register 14 by the D and DI inputs. The sign of the displacement, along with its value, can be counted on the indicator 15 during the next measurement period.

Claims (1)

Invention Formula 1 A device for measuring linear displacements containing a differential inductive sensor, the midpoint of which is connected to the input of the measuring generator, the output from Editor L.Zaytseva Compiled by I.Gorelov Tehred A. Kravchuk Proofreader O. Tsiple Order 320 Circulation 500 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 Subscription