SU1029005A1 - Photoelectric measuring device - Google Patents

Abstract

A PHOTOELECTRONIC MEASURING DEVICE containing an optical system, a sequentially installed and optically coupled modulator and a photodetector, a selective unit and a reference voltage generator, characterized in that, in order to improve the accuracy and extend the measuring range, it is equipped with a second selective unit connected in series , a rectifier, a first adder controlled by an inverter and a second adder, connected in series by a modulating voltage generator and a phase detector th, last output connected to second inputs of the controlled inverter and the second adder, the photodetector output is connected to the first and second vhodan polling blo (A Cove, the reference voltage generator is connected to B) ode first adder. with

Description

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with

The invention relates to instrumentation technology and can be used in the automatic contactless measurement of linear and angular displacements,

A device for measuring angles containing an optical pulse; a modulator, a reference voltage sensor, a photodetector, and two amplifier and conversion channels from measuring and reference, the outputs of which are connected to the phase difference converter {1.

However, the known device has low measurement accuracy due to the presence of interference.

Closest to the invention is a photoelectric measuring device containing an optical system., A sequentially installed and optically coupled modulator and a photoreceiver, a selective unit, and a reference voltage generator. The device also contains a detector and expander of the reference signal pulses and a selective circuit built on 1 / 2xI; 9 computing unit 2,

The drawbacks of the device are the narrow measurement range and the low measurement accuracy due to the applied signal isolation circuit and the errors caused by interference.

The purpose of the invention is to improve the accuracy and the expansion of the measurement range.

The goal is achieved by the fact that the photoelectronic testing device is equipped with a series-connected selective unit, a rectifier, a first adder, controlled by an inverter and a second adder, connected in series by a voltage modulating generator and a phase detector. rum, the output of the latter is connected to

, to the second inputs of the controlled inverter and the second adder, the output of the photodetector is connected to the inputs of the first and second selective blocks, the generator of the reference voltage is connected to the input of the first adder.

The drawing shows a block diagram of the device.

The device consists of O | G; 1CECKO

system 1, o; iOT receiver 2 and modulator 3. first selective block k, generator 5 of reference voltage s connected in series generator 6 of modulating voltage and phase detector 7 connected in series of second selective block 8, rectifier 9, first adder 10 , controlled by the inverter, 11 and the second sum.mator 12,

The device works as follows

5 i.

The light flux from the radiation source through the optical system 1 is supplied to the photodetector 2, the modulator 3 according to the voltage, supplied from the generator 6 of the modulating voltage, scans the image. Photo output of receiver 2, amplified in selective block i, tuned to the frequency

scan, detected by phase in phase detector 7 From the output signal of photodetector 2, the second harmonic is separated by means of an electoral block 8, the amplitude of which 5 is received, from rectifier 9 as a voltage, is added to the reference voltage and en / en received from the generator Ss on the adder 10. When the voltage exceeds (at the output of the phase detector 7 a certain value equivalent to the end of the allowable amount of deviation from the linear dependence of the amplitude of the harmonic of the spectrum of the output signal as a function of the measured value us, the output signal of the adder 10 changes the sign by means of a controlled inverter Phase detector July 1 i This signal is input to an adder 12. The other input is fed kotvrogo output of the phase detector 7 output from the adder 12 are measuring information Sh ,,

A positive effect is achieved due to the fact that the available elements of the device are the second selective unit, which is configured to double the scanning frequency J of the rectifier; controlled inverter; two adders allow partially compensating for the non-linearity of s, the dependence of the magnitude of the amplitude of the first harmonic component of the video signal of the photoreceiver I on the measured value by using the information content of the second. the harmonic component 10290054 of the video spectrum of the photodiode eotype, thus expanding the range and improving the measurement accuracy.

Claims (1)

PHOTOELECTRONIC MEASURING DEVICE, comprising an optical system, sequentially mounted and optically coupled to it a modulator and a photodetector, a selective block and a reference voltage generator, characterized in that, in order to improve accuracy and expand the measurement range, it is equipped with a second selective block, a rectifier connected in series the first adder controlled by the inverter and the second adder, connected - sequentially generator-connected. rum of the modulating voltage and phase detector, the output of the latter is connected to the second inputs of the controlled inverter and the second adder, the output of the photodetector is connected to the inputs of the first and second election blocks, the reference voltage generator is connected to the input of the first adder. S and, „. 1029005. 1029 (105