SU1693372A1 - Photoelectric displacement converter - Google Patents

Abstract

The invention relates to a measurement technique and can be used to measure displacement. The aim of the invention is to improve the measurement accuracy by eliminating the error due to the error of the groups of strokes of the indicator limb. When the measuring limb 6 is moved relative to the indicator limb 7, the & amp & and lit U / UL X4MU7 / I Y /// A Ys / L. Y // L 1 | f P -W URU / gL U / UUL 6 Qi of the intensity of the beams of the rays of the sources 1 and 2 of the radiation falling on the photodetectors 11, 10, 12 and 13, resulting in the output of the photodetectors 10-13 signals with a frequency proportional to the speed of movement, and an amplitude proportional to the intensity of the beams of the rays falling on the photoreceivers 10–13. By adjusting the variable resistance 3, the power of radiation sources 1 and 2 is adjusted, until the phase shift between the signals G and G becomes 90 °, the signal I1 is defined as the sum of the signals from the photodetectors 10 and 12, and Im is defined as the difference signals from photodetectors 11 and 13. The signals G and Im electronic unit 14 determines the amount of movement. 1 il. (L С / -9 1 Os th with so V h th

Description

The invention relates to a measurement technique and can be used to measure displacement.

The aim of the invention is to improve the measurement accuracy by eliminating the error due to the error in applying the groups of strokes of the indicator limb.

The drawing shows the functional diagram of the displacement transducer.

The photoelectric displacement transducer contains sources 1 and 2 of radiation, included in the balanced circuit using variable resistance 3 for changing the radiation power, condensers 4 and 5, measuring limb 6, made in the form of uniformly applied dashes, installed with the possibility of displacement and intended for bonding with controlled the object (shown), the indicator limb 7, made in the form of two groups 8 and 9 of uniformly applied strokes, shifted relative to each other by a quarter of the period, photodetectors 10-13, the photodetectors 10 and 11 are optically connected through a group of 8 strokes of the indicator limb 7, the measuring limb 6 and the condenser 4 to the source 1 of radiation, and the photoreceivers 12 and 13 are optically connected through a group of 9 strokes of the indicator limb 7, the measuring limb 6 and a condenser 5 with a radiation source 2, and an electronic unit 14.

The photodetectors 10 and 12 are connected in parallel and connected to one input of the electronic unit 14, and the photodetectors 11 and 13 are switched on counter and connected to the second input of the electronic unit 14.

The photoelectric converter operates as follows.

When moving the measuring lip 6 relative to the indicator limb 7, the intensity of the beams of the rays of the sources 1 and 2 of the radiation falling on the photoreceivers 10-13 is modulated. As a result, electrical signals with a frequency (l) proportional to the speed of movement and an amplitude proportional to the intensity of the beams of the rays falling on the photo-receivers 10-13 are formed at the output of the photodetectors 10-13.

From the outputs of photodetectors 10-13 remove signals

And Ai-sin o) g:

2 AT sin

Is Aa cos (a) t + (f)

l A2- cos (a) -f); where p- is the phase shift that determines the accuracy of applying a group of 8 strokes relative to a group of 9 strokes of the indicator limb 7,

Since the photoreceivers 10 and 12 are connected in parallel, the summation takes place at the input of the electronic unit 14, and the resulting signal r is determined from the expression

ten

l Ai -sinu) t + A2cos (a) I + p.

Since the photoreceivers 11 and 13 are turned on counter, a subtraction occurs at the input of the electronic unit 14, and the resulting signal I is determined from the expression

l Ar Sirtft) t + A2COS (tot + pl).

By adjusting the variable resistance 3, the power of the sources 1 and 2 of the radiation is adjusted, until the phase shift between the signals I1 and l becomes 90 °,

Next, signals I1 and i are fed to electronic unit 14, the output of which determines the amount of movement of the test object.

The proposed photoelectric displacement transducer provides

improvement of measurement accuracy due to elimination of the error caused by the error in applying groups of strokes of the indicator limb.

Claims (1)

Invention Formula A photoelectric displacement transducer containing a radiation source and a measuring limb arranged successively along the beam of the radiation source, made in the form uniformly applied strokes and intended for bonding with a controlled object, indicator limb, made in the form of two groups of uniformly applied strokes, shifted relative to each other by a quarter period, four photodetectors and an electronic unit, characterized in that, in order to improve the accuracy of measurement, it is equipped the second radiation source, the first and second the photodetectors are mounted so that they are optically connected with one group of strokes of the indicator limb, the third and fourth photodetectors are installed so that they are optically connected with the second group the strokes of the indicator dial, the first and third photodetectors are connected in parallel and connected to one input of the electronic unit, the second and fourth photodetectors are switched on and opposite5 16933726 The keys are connected to the second input of the electronic dial indicator dial with the first one and the second block, and the radiation sources are switched on by the bright photodetectors, the second source a balanced circuit with the ability to control radiation is optically coupled through measurements of the radiation power and a unique limb is installed, the second group of lines indicates that one of them is optically coupled through the 5th limb to the third and fourth measuring limb, the first group of stroke-photodetectors.