SU1254581A1 - Shift-to-digital converter - Google Patents

Abstract

The invention relates to the field of automatics and is intended to transform movements into a digital code. To increase the functional reliability of the converter, a fiber and an optical demultiplexer were introduced into it, and the coding element was made on multiresonant interference light filters designed to separate the luminous flux into a series of streams with a specific wavelength. The coding of the light flux is carried out by a code track, which consists of sections of the interference light filter, arranged in accordance with the code scale pattern. The light fluxes through the fiber are transmitted to the input of the optical demultiplexer, which performs the separation in space of the light fluxes of various lengths voltl. These streams arrive at the inputs of the photodetector unit. It generates electrical signals whose magnitude is proportional to the magnitude of the corresponding luminous flux. In the output signal generation unit, these signals are converted into a code convenient for the user. 1. ep f-ly, 3 silt, 1 tab. i o ate js

Description

The invention relates to automation and is intended to convert mechanical movements into a digital code.

The purpose of the invention is to increase the reliability of the converter.

FIG. 1 shows a block diagram of a converter; Fig 2 - the implementation of the coding element; in fig. 3 shows an optical de-multiplexer, a photodetector unit and an output signal generating unit;

The converter contains an illuminator, a coding element 2 with a code scale of 3, a slit diaphragm D, a light guide 5, an optical demultiplexer 6, a block 7 of photodetectors, a block 8 of generating output signals. The code scale 3 of the coded element 2 contains a transparent base 9, a multiresonant interference filter containing layers of sections in the form of films 10, 11, 12 and a code track 13. The optical demultiplexer 6 contains a base 14 and a film 15, interference filters 16 and a prism junction 17. The photodetector unit 7 contains the photodetectors 18, and the output signal generation unit 8, the comparators 19.

The Converter operates as follows.

The luminous flux from illuminator 1 is supplied to the code scale 3 of coding element 2, which is connected to the shaft.

The code scale 3 is a light-transparent base 9, onto which a multi-resonance narrow-band interference filter is applied, consisting of transparent films 10 with a thickness of ,, film 11 with a thickness of jfj, film 12 ronissH of t. The thickness of the films 10-12 is selected from the conditions:

,

J. 4p

 . f w h .. And t-it.

 2 2n

where 1 - waves of the main resonance of the material.

The reflection coefficient of the films 10

12 is determined by the number of layers with high and low refractive indices and the values of these indicators. Luminous flux from the illuminator

t, passed the code scale 3, acquires a discrete spectral composition of monochromatic components with wavelengths L ,, C, L, ,,. Cn, where n is the number of transducer bits, Implementation of color coding of movement is carried out by code track 13, which divides the light flux into streams with different wavelengths. So, for example /

yer, for a three-digit code, the corresponding code (for the code of the coding element 2, the sections of the code track 13 should have layers with fencing strips ,, ,, j. In this case

the correspondence between the output 1shm kodsm converter and the location of the individual sections of the code track

13 submits to the table.

+ +

+ +

 + + +

 +

1 O 1 1 1 O 1 1 1

The radiation passing through a certain part of the coding element 2 is a series of narrow spectral emission bands, the position of which is determined by the combination of the components deposited on this part of the coding element 2 and enters through the slit aperture 4 (the slit aperture 4 can play the role of the slit aperture 4 the light guide 5) to the input of the optical demultiplexer 6, which performs the function of separation in space of radiation with different wavelengths.

The optical demultiplexer 6 is a waveguide made of dielectric base 14 into which radiation is introduced from the output end of the light guide 5. On one side a thin film 15 of optically transparent material is applied to the waveguide. The foil 15 is glued using transparent glue with interference filters 16. Each filter 16 is designed to transmit a light flux of one wavelength A ,, t) (t or i, .. To the free surface of the filters 16, tapes 17 are glued, which direct their light fluxes waves to the input of the corresponding photodetector 18 of block 7.

As photodetectors 18, photosensitive elements can be used, the spectral characteristics of which are wider than the spectral range,.

From the output of the photodetectors 18, the signals arrive at the inputs of the block 8

Table continuation

20

25

0

five

0

S

generating output signals, which makes it necessary to generate the necessary code for the user. In the simplest case, this block can be performed on the comparator 19.

Claims (2)

1. A transducer for moving into a code containing successively located on the optical axis an illuminator, a coding element and a slit diaphragm, a block of photodetectors, the outputs of which are connected to the inputs of the output signal formation unit, characterized in that, in order to improve the reliability of the converter, an LED and an optical demultiplexer, and the coding element is made of optically transparent bases, a mono-resonant interference filter and a code track consisting of According to the code scale pattern, the light guide and the optical demultiplexer sequentially located on the optical axis are installed between the slit diaphragm and the photodetector unit. 2. The converter according to claim 1, characterized in that the optical demultiplexer contains a dielectric base, with a film applied on it of an optically transparent material, on which is placed the H interference filters with the corresponding 1 2 prism of the branch lines. Juljulj l ka9y P JULJLJL. - l Jsl Juljl "TJUUl --Y d . L | Lda one .. .., nd tfdvtsoyu nd «« oyudg Editor M.Petrova Compiled by Y. Kotov Tehred V. Kadar m 97tf. " Corrector B. Sirohkan Zakae 4729/58 Circulation 816. Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab, 4/5 Production and polygraphic enterprise, Uzhgorod, Projecto st., 4