SU1348643A1 - Raster displacement converter - Google Patents

Abstract

This invention relates to a measurement technique. The purpose of the invention is to increase the resolution. The light source 1 generates parallel beams of beams directed to the movable and stationary elements 2, 3 with applied measuring and indicator grids. The signals taken from the photodetectors 4 are subtracted from the constant component in the voltage displacement block 5, at the output of which two sinusoidal signals are generated, out of phase with each other by 90 °, arriving at the inputs of the zero-organs 6, 7 and units 9, 10 of the allocation module signal. The rectangular signals generated by the zero-points 6, 7, are fed to the adder 8 modulo two, at the output of which signals with a double frequency are formed. The unipolar signals generated by the modules 9, 10 for extracting the signal module are fed to the inputs of the comparator 11, at the output of which signals with a double frequency are formed. 2 Il. (L CO 4; cx O5 4 00

Description

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The invention relates to a measurement technique and can be used in the construction of raster displacement sensors.

The purpose of the invention is to increase the resolution.

Figure 1 shows the functional diagram of the device; figure 2 - timing charts of the signals forming

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The converter contains optically coupled light source 1, a movable

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element 2 with applied measuring raster grid, stationary element 3 with two indicator raster grids, displaced from each other by a quarter of the raster grid period, applied The inputs of which are connected to the outputs of the voltage offset unit 5, the adder 8 modulo two, the inputs of which are connected to the outputs of the zero organs 6 and 7, the blocks 9 and 10 of the selection of the signal module, made in the form of two half-period rectifiers drives, the inputs of which are connected to the outputs of the voltage displacement unit 5, the comparator 11, the inputs of which are connected to the outputs of the blocks 9 and 10, of the signal module.

The Converter operates as follows.

The radiation flux in the form of parallel beams of rays, generated by the light source 1, is directed to the raster junction formed by raster gratings applied to the moving 2 and fixed 3 elements.

When moving the movable element 2 relative to the fixed element 3, the signals at the output of the photoreceivers 4 are formed that are out of phase with each other. The constant component of the signals is subtracted by the voltage displacement block 5, at the output of which alternating signals are formed, the shape of which is close to sinusoidal, shifted from one another by 90 °, arriving at the inputs of the zero-organs 6 and 7

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and the inputs of blocks 9 and 10 of the allocation module signals.

At the output of the zero-organs 6 and 7, rectangular unipolar signals are formed, arriving modulo two at the inputs of the adder 8, at the output of which signals with double frequency are formed.

The unipolar signals generated at the outputs of the blocks 9 and 10 of the selection of the signal module are fed to the inputs of the comparator 11, at the output of which rectangular signals are formed with 15 double frequency relative to the frequency of alternating signals generated at the output of the block 5

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displacement of voltages shifted in phase by 90 relative to the rectangular signals generated at the output of the adder 8 modulo two.

The use of a converter allows to increase its resolution due to the formation of two pairs of rectangular signals when the moving element of the converter is moved by an amount equal to one period of the raster grid.

Claims (1)

Invention Formula A raster displacement transducer containing optically coupled light source movable element with applied measuring raster grille, fixed element with two indicator raster grids, shifted one relative to another by a quarter of the period raster grating, photodetectors, voltage bias unit, the inputs of which are connected to photodetectors, a comparator, characterized in that, in order to increase the resolution, it is equipped with two zero-organs, whose inputs are connected to the outputs of the voltage bias unit, modulo two, the inputs of which are connected to exits null-organs, two units of the signal module selection, the inputs and outputs of which are connected respectively to the outputs of the voltage bias unit and the inputs of the comparator. US U6 U7 U8 U9.10 fig 2 Editor N.Kishtulinets Compiled by T. Aisin Tehred M. Khodanych Order 5178/39 Circulation 676 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab, 4/5 Production and printing company, Uzhgorod, st. Design, And Proofreader M. Pojo