SU1226060A1 - Photoelectronic displacement transducer - Google Patents

Abstract

The invention relates to contactless means for measuring the movement of an object with a reflective surface. The aim of the invention is to reduce the t, the temperature error of the sensor, achieved by supplying the emitters 1 and 5 with phase-shifted signals from the generator 9 and the phase shifter 10. On the photodetectors 4 and 8, the modulated light fluxes reflected from the object 14, input and output optical fibers 2 are added , 3.6 and 7, with light fluxes, delivered by optical fibers II and 12. In photoreceivers 4 and 8, signals are generated, the phase difference of which changes little with the change in the power of emitters 1 and 5. 2 ill. SL

Description

The invention relates to a measuring technique and can be used for contactless measurement of the movement of an object having a reflecting surface.

The aim of the invention is to reduce. temperature measurement error.

Fig; 1 shows a functional diagram of the proposed sensor; FIG. 2 shows a vector diagram of the signals generated at the inputs and outputs of the photodetectors.

The sensor contains optically coupled first emitter 1, first supplying light guide 2, first emitting light guide 3, first photoreceiver - nick 4, second emitter 5, second supplying light guide 6, second emitting light guide 7, second photodetector 8, generator 9 the phase shifter 10, the input of which is connected to the generator 9 and the output to the first radiator 1, the first additional light guide 11, the optically coupling first emitter 1 and the second photoreceiver 8, the second additional light guide 12, the optical linking second radiator 5 and photodetector 4 , phase meter 13, the inputs of which are connected to the first and second photodetectors 4 and 8.

The displacement of object 14 is measured.

The sensor works as follows.

The generator 9 generates pulses fed to the second emitter 5 and through the phase shifter 10 to the first emitter 1.

The radiation fluxes formed by the first and second radiators I and 5 are directed through the first and second supplying fibers 2 and 6 to the reflecting surface of the object 14, and through the first and second additional fibers 11 and 12 to the second and first photodetectors 8 and 4 , to which the light fluxes reflected from the reflecting surface of the object 14 are directed through the second and first diverting light guides 7 and 3.

In the first and second photodetectors 4 and 8, signals are generated, the magnitude of which is determined by the vector sum of the non-reflected and reflected

from the object of modulated light fluxes.

When moving object 14 reflected light streams supplied

to the first and second photodetectors 4 and 8 through the first and second output fibers 3 and 7, which leads to a change in the phase difference of the signals taken from the first and second photodetectors 4 and 8, which is measured by a phase meter 13.

When the power of the radiation flux, formed, for example, by the second radiator 5, changes as

The temperatures (Fig. 2) simultaneously change the power of the light fluxes incident on the first and second photodetectors 4 and 8. At the same time, the phase difference between the signals taken from the first and second photodetectors 4 and 8 changes to a lesser extent compared to the change in the power of the stream. radiation generated by the second emitter 5. The use of the proposed sensor makes it possible to measure the amount of movement of an object in a wide temperature range.

Claims (1)

Invention Formula A photoelectric displacement transducer containing the optically coupled first emitter, the first supply and output optical fibers and the first photo: receiver, recording unit, which is based on the fact that, in order to reduce the temperature measurement error, it is equipped with an optically coupled second emitter, an optical fiber and a second optical fiber, a second photodetector, a generator connected to the second radiator, a phase shifter whose input is connected to a generator, and the output is connected to the first emitter, two additional optical fibers, the first emitter is optically connected through the first additional light guide to the second photodetector, the second emitter is optically connected through the second additional light guide to the first photodetector, the registration unit is designed as a phase meter, the inputs of which are connected to the first and second photodetectors, Editor O. Yurkovetska Compiled by T.Aisin Tehred I. Popovich Proofreader L. Pat ai Order 2111/29 Circulation 670 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 Figg