RU2018086C1 - Device for measuring displacements of object - Google Patents

Abstract

FIELD: measurement technology. SUBSTANCE: device has accelerometer 1, normalizing converter 2, integrator 3, comparator and serially-connected synchronous rectifier, voltage-to-frequency converter 5, comparator 10, reversible counter 6, register 7, interface 8 and computer 9. EFFECT: enhanced accuracy. 1 dwg

Description

 The invention relates to measuring technique and can be used to measure the path of vehicles and alternating movements of objects.

 A level meter is known, comprising a series-connected accelerometer and two integrators, both integrators having correction circuits, each of which contains a phase correction circuit, an additional integrator, and a sampling and storage circuit connected in series. Correction circuits form integrator feedback circuits, the inputs of each of the two circuits are connected to the outputs of the respective integrators, and their outputs are connected to the inputs of these integrators.

 However, this device has low measurement accuracy due to the accumulation of large errors as a result of double analog integration, as well as a limited range of operating frequencies due to the influence of integrator correction circuits.

 The closest in technical essence to the invention is a device for measuring displacements, containing a series-connected accelerometer, a normalizing transducer, two integrators. A Schmitt trigger is connected to the output of the normalizing converter, the output of which is connected to the integrator input and the control input of the key that closes the capacitor in the feedback circuit of the first integrator, and the inverter output is connected to the control input of the second key that closes the capacitor in the feedback circuit of the second integrator.

 The disadvantage of this device is the low accuracy of the measurement due to the cumulative error of double analog integration, as well as a limited scope, since the device does not allow to measure alternating movements.

 The aim of the invention is to improve the measurement accuracy and expand the scope.

 This goal is achieved by the fact that a comparator and series-connected synchronous rectifier, voltage-to-frequency converter, a reversible counter, a register, an interface, and a calculator are introduced into the device for measuring the displacements of an object containing an accelerometer with a normalizing converter connected to an integrator. In this case, the integrator output is connected to the inputs of the synchronous rectifier and the comparator, the output of which is connected to the control inputs of the synchronous rectifier and the reversible counter, and the corresponding outputs of the interface are connected to the register enable input and the reset counter zeroing input.

 The drawing shows the proposed device.

 The device for measuring the displacement of the object contains a series-connected accelerometer 1 with a normalizing transducer 2, an integrator 3, a synchronous rectifier 4, a voltage to frequency converter 5, a counter 6, a register 7, an interface 8 and a calculator 9, as well as a comparator 10. The output of the integrator 3 is connected to the input of the comparator 10, the output of which is connected to the control inputs of the synchronous rectifier 4 and the reverse counter 6, and the corresponding outputs of the interface 8 are connected to the write enable input of the register 7 and input to reset the reverse counter.

 The device operates as follows.

 When moving an object on the accelerometer 1, an acceleration signal appears, which enters the normalizing transducer 2, where it is amplified and supplied to the integrator 3. The output voltage of the integrator is proportional to the speed of the object. It arrives simultaneously at the inputs of the comparator 10 and the synchronous rectifier 4. The comparator is used to determine the sign of voltage and the speed of movement of the object. It forms the logical levels that control the operation of the synchronous rectifier 4 and the reverse counter 6. An alternating voltage is formed at the output of the synchronous rectifier 4, which is supplied to the voltage converter 5 to the frequency.

 Thus, the pulse frequency at the output of the transducer 5 is proportional to the absolute value of the speed of the object, and the logic level at the output of the comparator 10 determines the sign of the speed. The pulses from the Converter 5 go to the counting input of the counter 6, and to the control input - logical levels corresponding to the sign of the account. The number of pulses counted by the counter corresponds to the increment of the movement of the object for a given time interval, presented in an additional binary code, and the most significant digit will be significant.

 At the command of the calculator 9, this code is rewritten into register 7, the counter 6 is reset and the code is transmitted via the interface 8 to the calculator 9. The calculator sums the increments of displacements taking into account the sign and high-pass filtering to exclude the constant component.

Claims (1)

 A device for measuring object displacements, comprising an accelerometer with a normalizing converter connected to an integrator, and a calculator, characterized in that it is equipped with a comparator and a synchronous rectifier connected in series, a voltage to frequency converter, a reversible counter, a register and an interface connected to the calculator, the integrator output is connected to the inputs of a synchronous rectifier and a comparator, the output of which is connected to the control inputs of a synchronous rectifier and a reverse counter, and the corresponding outputs of the interface are connected to the input enable register entries and the input zeroing of the reverse counter.