SU1259486A1 - Shift-to-digital converter - Google Patents

Abstract

The motion to code converter is in the field of automation and computing. The aim of the invention is to improve the accuracy of the converter. The goal is achieved by the fact that in the converter containing the illuminator, the code element, the PHOTO receivers and the EXCLUSIVE, ICH, AND, key and inverter elements are entered, a prism, a foclin, a light guide and an optical demultiplexer, the elements introduced allow to realize the spatial-frequency coding of the movement , which eliminates the need for accurate positioning of the photodetectors against the code tracks and reduces, by means of frequency multiplexing, the number of lines of communication between the opto-mechanical and electronic units to a minimum. The code element modulated by the marks of the linear spectrum, which are formed with the help of a prism, enters the corresponding photodetectors through the foclin, the optical fiber and the optical demultiplexer. From their outputs, the signals are sent to the decoder, where they are processed and converted into code. To correct the error formed by the inaccuracy of the production of the scale of the code element, signals from the output of the I element are used. If a logical 1 signal is generated at its output, the inverter inverts the signal from the corresponding photodetector, if the logical signal is O, then passes it without inverting. This eliminates the manufacturing error of the code element. 3 il.

Description

The invention relates to the field of automation and computer technology and can be used in systems for converting non-bias into code.

The aim of the invention is to improve the accuracy of the converter.

FIG. 1 shows a structure-to-converter circuit; Fig.2 is a diagram of an optical demultiplexer; in fig. 3 is a diagram of the spatial-frequency interpolation of the code track of the lower bit of the code element.

The converter contains an illuminator, a prism 2, code element 3 JC tags, the period and width of which are, respectively, a, ° LIN 4, light guide 5, optical demultiplexer 6, photodetectors 7, decoder 8, elements ULEDIMATE OR 9, element I 0, inverter P , key 12, Optical demultiplexer 6 contains a waveguide 13, deposited on the base 14, taps 15, interference filters 16, outputting radiation with wavelength A,,, ,,, respectively.

The Converter operates as follows.

The luminous flux from illuminator 1 (Fig. 1) is directed by a narrow beam to the entrance face of the prism 2, on the output face of which a linear emission spectrum is formed, the lines of which are parallel to the marks of code element 3 The emission spectrum is determined by the material from which the filament of the incandescent lamp used as illuminator 1. When moving the code element 3 rigidly connected with the object of measurement, the opaque markings of the lines of the spectrum of the radiation passing through the code ment 3 at the entrance end fok lin 4.

The spectral composition of the radiation is a function of the movement of code element 3 relative to the output face of the prism 2. The light flux concentrated by the focline 4 is transported by the optical fiber 5 to the optical de multiplexer 6, the number of outputs N of the optical demultiplexer 6 is determined by the step and the interpolation period of the code element poison. 3: N

 § 2ia

Wavelength - c; (where i 1, N) and the transmission bandwidth 1 (Fig. 3) of the interference filters 16 (Fig. 2) are determined by the parameters of the emission spectrum in the selected working area b

 X, X,

 1 (FIG.

1 and 3) output graph

0

thirty

35

neither prism 2 and the selected interpolation & a,

From the outputs of the optical demultiplexer 6, optical signals are fed to photo detectors 7, having a uniform frequency response in the range 1 - D N of the corresponding emission spectrum within the working area, into the output face of the prism 2. At the outputs of photodetectors 7, electrical signals are generated as a single position code, which Even 20, they are fed to the inputs of the decoder 8. To correct the error of marking of code element 3, signals from the extreme pairs of photodetectors 7 are sent to the EXCLUSIVE OR elements 9. Exit signal nal from AND gate 10 is applied to the input 12 of the key.

When a signal appears at the input of the key 12 (it is possible only for false code words), it will pass the inverted signal from the photodetector 7 to the output, convert the false words into the corresponding code combinations, which will reduce the error to a value not exceeding the unit of the lower bit. When the signal O on the control input of the key 12, the signal from the photodetector 7 passes through it without

change

40

Claims (1)

Invention Formula The displacement transducer into the content code is an illuminator, a code element with tracks of not evenly applied marks, three groups of photodetectors, with the outputs of the photoelectric equipment of the first group connected to the inputs of the first element of the IDLER, and the corresponding inputs of the decoder, the outputs of the photoreceivers of the second rpyrrnfii are connected to the inputs of the second element EXCLUSIVE OR, the output of one photoreceiver of the second group is connected to the corresponding input of the decoder, the outputs of the photoreceivers of the third group are connected to the corresponding inputs of the decoder, the outputs of the first and second elements SPEAKER OR are connected to the inputs of the AND element whose output is connected to the first input of the key, the output of another photoreceiver of the second group is connected via an inverter to the second input of the key and directly to the third the key input, the output of which is connected to the corresponding input of the decoder, the output of which is the output of the converter, characterized in that, in order to increase the accuracy of the converter, into it prism, fox, light guide and optical demultiplexer are provided, the prism is located between the illuminator and the code element, its input face is optically connected to the illuminator, and the output face is optically connected to the input end of the foclin, the output end of which is optically connected to the input end of the fiber, the output end of which is 9pactically connected to the input of the optical demultiplexer The outputs of which are: JpoYo are optically connected to the inputs of the corresponding photodetectors of the first, second and third groups. : COS) ( 1 J5  14 ./ tL // K / Shine. Z x jOcMoSai  HUf FIG. 2 S (A) . L . j - s. St 7, La Compiled by Y. Kotov Editor L. Gratilo Tekhred L. Serdyukova, Proofreader I. Muska Order 5139/58 Circulation 816 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 FIG. 3