SU1587631A1 - Optico-electronic shaft angle-of-turn-to-code converter - Google Patents

Abstract

The invention relates to automation and computing and can be used to communicate sources of analog information with a digital computing device. In order to increase the accuracy and expand the range of conversion into an optoelectronic converter of the angle of rotation of the shaft into a code containing a multifaceted prism reflector associated with the shaft, a lens, a reflecting prism, an optical compensator with stops, first and second light sources with capacitors, photo receiver, error signal shaping unit, drive, reading unit and power supply unit, additional reflector, pentaprism, third and fourth light sources with condensers, beam splitter, two limit switches bodies, analog-to-digital converter, two comparator, two elements And, a trigger and a dual switch. The displacement of the light source rays relative to the aperture of the photodetector during the rotation of the multifaceted prism is compensated by the movement of the optical compensator with the help of a drive-controlled signal shaping unit. An analog-to-digital converter converts the output signal of the readout block, proportional to the movement of the optical compensator, into a direct or additional code depending on the number of light sources being powered. 1 il.

Description

The invention relates to automation and computing and can be used to communicate sources of analog information with a digital computing device.

The purpose of the invention is to increase the accuracy and expand the range of conversion.

The drawing shows a block diagram of the converter. .

The converter contains a reflector in the form of a multifaceted prism 1, shaft 2, lens 3, reflecting prism 4, photodetector 5, optical compensator 6, additional reflector 7, pentaprism 8, first 9, second 10, third 11 and fourth 12 light sources with condensers 13- 16, a beam splitter 17, an error signal generation unit 18, a drive

9 :, readout unit 20, endclosures, detectors 21 and 22, stops 23 and 24, analog-digital converter 25, compressors 26 and 27, elements And 28 and 29, trigger 30, dual switch 31, power supply unit 32 .

The error signal shaping unit 18 comprises a differential amplifier 33 and a phase-sensitive rectifier 34.

I The converter operates in the following manner.

With a single output signal from the tr igger 30, the power supply unit 32 via the dual supply switch 31 with phase-phase voltages is first

ei

and the second 10 light sources. Shine

The oi of sources 9 and 10 pass through the sensors 13 and 14, reflecting the prism Mi 4, the beam splitter 17, the optical compensator 6, the lens 3, the additional reflector 7, and is reflected from the multifaceted prism 1, the reflected light 25 from the multifaceted prong 1-1 1 of the sources 9 and 10 passes on photodetector 5 through additional reflector 7, objects 3, optical compensator, 6 and beam splitter 17. In view of the angular position of shaft 2, a light spot from 1 is placed on the surface of photodetector 5. Block 18 of the output signals of the photodetector 5 generates a signal mismatch Vani proportional to the displacement of the light spot relative to the diaphragm 5. Actuator frtopri- emnika 19 peremepshet optical compensator 6 formed in wedge yide to yield zero rassoglasove 1 and 0 signal. The movement of the optical compensator 6 is converted into an electrical signal by a unit 20f in which the potentiometer can be used. If the optical compensator 6 reaches the limit switch 5, for example 21, and the stop 23 and further shaft 2 turns in the same direction, the error signal will increase and the comparator 26 will work, taking into account the presence of a signal at the output of the terminal switch at the output of the element And 28. Trigger 30, working in counting mode for each-. the house to the entrance, the power supply unit 32 is transferred via a dual switch 31 to power sources 11 and 12 of light instead of sources 9 and iO of light. If, after the operation of the limit switch 21, the shaft 2 stops or a: you rotate in the opposite direction, the error signal will not exceed the threshold of the comparator 26 and the switching of the light sources will not occur. After switching, sources from sources 11 and 12 pass through condensers 15 and 16, reflecting prism 4, beam splitter 17, optical compensator 6, lens 3, pentaprism 8, reflecting from another facet of multifaceted prism 1 and through 15 pentaprism 8, lens 3, optical the compensator 6 and the beam splitter 17 is fed to the photodetector. Due to the double reflection of light in the pentaprism 8 with one direction of rotation of the shaft 2, the light spot is displaced on the photo receiver 5 in different directions when powering the sources 9, O and 11.12 of light. When this occurs, the movement of the optical compensator 6 from one stop to the other and back. The analog-to-digital converter 25 converts the output information of block 20 into a direct or additional code depending on the output signal of the trigger 30.

Thus, the use of a multifaceted prism expands the range of measurements of the positions of shaft 2 and increases the accuracy of the conversion by reducing the divergence of the rays reflected from the multifaceted prism.

Claims (1)

Invention Formula An optical-electronic converter for the angle of rotation of the shaft into a code containing a reflector rigidly connected with a rotating shaft, the first and second light sources with condensers e optically connected respectively to the first and second faces of the reflecting prism, the drive, kinematically connected A lens connected optically with an optical compensator with stops, optically coupled with an optical compensator, whose photodetector has its output connected to one input of the error signal generator, another input of which is connected to one th output power and the output unit 5, connected to the input drive and wherein (which raspgireni 5 in order to measure the range and accuracy povsh1eki five, the transducer, the third and fourth light sources with condensers, a beam splitter, an additional reflector, pentaprism, two limit switches. , two comparators, two AND elements, a trigger, a dual switch and an analog-to-digital converter, the reflector connected to the rotating shaft is made in the form of a multifaceted prism, the third and fourth sources of the optical light are connected optically with the first and second edges of the reflecting prism , the first and second faces of the reflecting prism, optically connected with the first and second light sources, are optically coupled through a beam splitter, an optical compensator, a lens and an additional reflector with some faces of a multi-faceted prisms, first and second faces of a reflective prism, optically coupled to the third and fourth light sources, are optically coupled through a beam splitter, optical compensation876 1 .6 torus, lens and pentaprism with other faces of a multifaceted prism; a beam splitter is optically coupled to a photodetector; the output of the error signal shaping unit is connected to the inputs of the first and second comparators whose outputs are connected to the first inputs of the first, respectively 0 and the second element And, the second entry. which are connected respectively to the outputs of the one and the other rigidly connected with the respective stops of the limit switches, the outputs of the electric 5} And are connected to the trigger inputs, the output of which is connected to the control input of the dual switch and the control input of the analog-digital converter, the information input of which connected to the output of the readout unit, the outputs of the power supply unit are connected to the information switches of the dual switch, the outputs of which are connected respectively 25 with light source inputs.