SU676862A1 - Optronic displacement measuring device - Google Patents

Description

The device works as follows.

Optical system 1 forms an interference pattern from which one interference fringe (dark or light) is cut out with a slit diaphragm 2. The matrix discrete phototransducer 3 is rotated relative to this band by means of a rotary device 4 and an angle a, which is chosen based on the condition of the first element of each column following the last element of the previous column. In the general case, the value of the angle a can be determined from the ratio

a - {d

and arctg

+,

p-b + (p-1)

where a, b - the geometrical dimensions of the individual element; n - the number of elements in the column;

d is the distance between the elements in the line; c is the distance between the elements in

column; F is the angle of inclination of the bands in the interface, .., ... the picture of the picture, relative: -,, PO of the vertical axis. When an object is displaced, a movement occurs. fringes of the interference pattern. -i When the boundary of the two bands falls onto the surface of an individual element of a phototransfer, it enters a new state — from “1 to” O or from “O to” 1, depending on the order of the stripes. Of all the elements of the matrix PV 3, only one is in a transient state. Since the boundary of the strips passes through it, all the previous elements are in the opposite state to the next ("O or" O and "1).

The interrogation of the elements of the matrix PV transducer is performed using a switch 5, which determines the element in the transition state, and transmits the counting pulse from it to the counting circuit 7. The control unit 6 serves to control the operation of the switch 5 and ensures the connection of that of the elements of the matrix photovoltaic converter for which the condition of finding

all previous and subsequent elements for it in opposite states. The reversible counting of the bands occurs due to the fact that the switch interrogates three elements of the matrix photovoltage transducer — the working one, which is in the transient state, the previous one for it and the next one. Depending on which element after the worker goes into

transition state, the control unit issues a command for the counting circuit and the reversible counter for summing or subtracting the counting pulses. So the placement of the matrix

A discrete phototransducer at an angle a to the interference pattern and the introduction of a switch and a control unit into the device allows to increase the measurement accuracy by eliminating the influence of the width of the element and the distance between the elements on the resolution of the device.

Claims (2)

Invention Formula An optoelectronic device for measuring linear displacements containing successively located interference optical system, a slit diaphragm, a discrete photovoltage transducer, a counting circuit and a reversible counter connected to its output, characterized in that, in order to increase the sensitivity, it is equipped with a turning device, a switch and a unit control, the output of the discrete photovoltaic converter is connected to the first input of the switch, the second input of which is connected to the first output of the control unit, and you move - to the first input of the account, the second the input of which is connected to the second output of the control unit, the discrete photovoltage transducer is made in the form of a matrix mounted on a rotating device and located at an angle to the interference pattern. Sources of information taken into account in the examination of I. USSR author's certificate No. 194330, cl. G 01B 9/02, 1965. 2. Presnukhin L.P. Photoelectric information converters, M., Mashinostroenie, 1974, p. 180-183. CZD