SU1323864A1 - Photodetector device - Google Patents

Abstract

The invention relates to devices for detecting radiation fluxes and can be used in apparatus for precision measurement of the position or displacement of a light beam in two coordinates. The goal is to improve the accuracy and registration of the position of the light beam along the X and Y coordinates. The goal is achieved by eliminating the mutual penetration of signals from the recording channel along one coordinate into the recording channel along another coordinate. Each recording channel consists of two photodiodes 1, 2 and 3, 4, each of which is connected to the inputs of operational amplifiers 10, 22 and 9, 21. The light flux is recorded from the output signal of amplifiers 9, 10, which are periodically shunted by keys 17, 16, the discharge capacitors 12 and 13. At the same time, the keys 5, 6, 7, 8 unload the capacitances of the photodiodes 1, 2, 3, 4. Thus, at the input of the recording device 14

Description

The invention relates to devices for detecting radiation fluxes and can be used in multi-purpose equipment for precision measurement of the position or displacement of a light beam in two coordinates.

The purpose of the invention is to improve the accuracy of recording the position of the light beam in two coordinates.

In the drawing there is an electrical circuit of a photodetector device.

The device contains photodiodes 1-4, the anodes of which are connected to the zero potential zero, switches 5, 6, P1unt photodiodes 1, 2, and a commutator 7, 8, shunt photodiodes 3, 4, operational amplifiers 9, 10, covered a feedback resistor, the cathodes of photodiodes 1, 3 are connected to the non-inverting inputs of the amplifiers. The outputs of amplifiers 9, 10 are under; they are connected to the inputs of the adder 1 1 and through the capacitors 12, 13 to the inputs of the nodes 14, 15 pei-istation, connected through switches 16, 17 with a safe zero note. The control inputs of the switches 5, 6, 7, 8, 16, 17 are connected to the output of the one-selector 18, the input connected to the output of the reference circuit 19, one input of which is connected to the output of the adder 11, the other to the source 20 of voltage. The device also contains operational amplifiers 21, 22, covered by a resistor, and inverting the inputs through resistors 23, 24 are connected to the inn zero potential, non-inverting inputs - respectively with the cathodes of photodiodes 2, 4. The outputs of the amplifiers 21, 22 through the resistors 25, 26 are connected to the inverting inputs of the wuxi; | heels 9, 10.

The device works as follows.

When the switches 5-8 are locked, the ramp signals appear at the inputs of amplifiers 9, 10, 21, 22. 1: If the resistances of resistors 23, 24 are equal to the feedback resistors of usinacators 9, 10, and those of resistors) of the feedback of amplifiers 21, 22 are equal to those of resistors 25, 26, then the isa output of the amplifiers 9, 10 appear linearly increasing sp1-nalb) 1, the current values of which are proportional to the corresponding ghost light fluxes incident on photodiodes 1, 2 and 3, 4. The transmission coefficients but to the inputs of the adder 11 are selected such that its output appears linearly increasing signal proportional to the luminous flux incident on all e photodiodes, i.e., the proportional energy of the light beam. At the time when the voltage at the output of the adder is equal to 1m to the reference voltage of source 20, the circuit IJ compares and its output signal to

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The output of the one-shot 18 through E is the pulse through which all the switches and the self-capacitance of the photodiodes are closed, and the capacitors 12, 13 are discharged. As a result of alternation of accumulation cycles (growth) and discharge of these capacities at the inputs of registration nodes 14, 15, there are sawtooth signals, the amplitude of which is determined only by the displacement of the light beam on the sensitive surfaces of photodiodes along X and Y coordinates and does not depend on magnitude of the beam energy. Nodes 14, 15 of the registration can be made in the form of a level memory circuit. Then their control inputs are connected to the output of the one-vibrator, and control, 1 inputs of the switches are connected to the output of the one-vibrator via the delay element. Registration sites can also be performed as low-pass filters, as comparison circuits. Switches 16, 17 are divided into recharges)) deaators 12, 13 up to the pulses of power, 1, and 9 chippers, 10, i.e. P0 | -resistance due to their temperature drift are eliminated.

We offer (.) E the invention allows; 1 em to eliminate frontier due to mutual v. Or channels.

Ph o m 11l i: 10 p with shadow A photon receiver device, which has two channels of recording the luminous flux in the X and Y coordinates, every 1) 1 н n: which contains two () c) diodes, one ii3 of the same name, electr () .colls (zbld .ineny, two switches of the oracle, shchunliruyuschie 1) otodiodes, oneraniynop usnlg: l spruce, covered by a resistor return) nd. to one of the inputs of which 1 (;,., k; 1Uchen free output of the first 4) () lh) for 1. : a, and u move the move, l podl.l1oche | to input l. oCniero d, l both cana-. KG s ;, the generator and through the condenser - to the plenum- () of the node, unified,: a communal station with a useful left-handedness: l. 1, control panel to) N1 inputs of the communica- tion of the 1 and 4 channels. 1 are connected 1) 1 to 5

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Claims (1)

A photodetector containing two channels for recording the light flux in X and Y coordinates, each 11.1 of which contains two photodiodes, one of the same electrodes of which are combined,. two switches, shunting photodiodes, an operational amplifier covered by resistor feedback, to one of the inputs of which the free output of the first photodiode is connected, and the output of the amplifier is connected to the input of the adder common to both channels and through the capacitor to the input of the recording unit, connected through the switch with a zero inpe11 bus; ¹ 11:, ι: ι. the control inputs of the commutator of both channels are connected to the output of a single vibrator, the input connected to the output of the comparison circuit, one input of which is connected to the output of the adder, the other with a voltage source, characterized in that, in order to improve the accuracy of recording the position of the light beam in two coordinates, in each channel of registration, a second operational amplifier is introduced, covered by resistor feedback, one of the inputs of which is connected to the target potential bus through the first resistor, and the other input with a free output in orogo photodiode and output via a second resistor coupled to a second input of the first operational amplifier and the input of the adder, wherein the oc-edyapeniye conclusions photodiodes are connected to zero potential bus.