PHOTOELECTRIC METHOD OF MEASURING LINEAR DISPLACEMENTS OF SMALL-SIZE OBJECTS IN SENSORS WITH MULTI-ELEMENT RADIATION RECEIVERS AND DEVICE REALISING SAID METHOD Russian patent published in 2014 - IPC G01B11/00 G01B11/14 

FIELD: physics.

SUBSTANCE: method involves focusing an image of the object with a lens in the plane of the receiver, scanning the image back-and-forth along a line of elements of the receiver, predetermining the number N of the irradiated element of the receiver, disconnecting outputs of the rest of the elements, performing periodic uniform back-and-forth scanning of the image of the object with the irradiated element with an amplitude equal to the width of the element b, generating reference pulses in the middle of each scanning half-period, measuring time intervals Δt₁ and Δt₂ between signal fronts and reference pulses in each scanning half-period, and measuring the difference thereof Δt=Δt₂-Δt₁. Linear displacement x of the image of the object is determined using the formula x=Nb+bΔt/T, where T is the scanning half-period. The device has a lens, a multi-element radiation receiver in form of a line, an electronic module for signal processing when scanning the image of the object within the width of one element of the receiver and a linear motor for facilitating back-and-forth movement of the holder of the receiver within the width of its element.

EFFECT: high accuracy of measuring linear displacements.

4 cl, 2 dwg