SU1223031A1 - Fiber-optical sensor for measuring object displacement - Google Patents

Abstract

The invention relates to a measurement technique and can be used to measure displacements. The measurement range is expanded by rotating kinematically coupled gears. The light beam from the source, which passed the first light guide, is directed to a mirror fastened to the object under control; having reflected from the mirror, the beam hits the line of the second light guide. When the mirror moves along the normal to it, the reflected light beam from it successively illuminates the ends of the second light guide and through them the various elements of the light-receiving device, where the optical signal is converted into an electric signal, and the unit performs the necessary processing. The spatial position of the luminous flux on the light-receiving device carries information about the movement of the object under control. 2 Il.

Description

The invention relates to a measurement technique and can be used to measure the movement of an object in machine building and instrument making.

The purpose of the invention is to expand the measurement range.

Figure 1 presents the scheme of the proposed sensor; Fig. 2 is a scheme for measuring displacements;

The sensor contains a source of monochromatic radiation, a light guide 2, a reflecting element 3, for example, a mirror intended for fastening with a controlled object, a second light guide A, a light receiver 5, a recording unit 6, differently sized gear wheels 7 and 8, kinematically interconnected as well as the first 9 and second 10 fibers, the ends of which are optically coupled to each other.

The light guides are bonded with gears.

The sensor works as follows

The light beam from the source 1, which passed through the first light guide 2, is directed to the mirror 3 attached to the object being monitored. Reflected from mirror 3, the light beam hits the ruler of the second light guide 4. When mirror 3 moves along the normal to it, the reflected light beam from it successively illuminates the ends of the second light guide 4 and through them various elements of the light source 5, where the optical signal is converted into an electrical one that registers block 6 carries out the necessary processing.

The spatial position of the light spot on the light receiver 5 carries information about the movement of the object being monitored.

If it is necessary to change the measuring range of the movement, the sensor can be reconfigured with the help of

311

The gates are kinematically connected toothed wheels 7 and 8, with which the first 2 and second 4 optical fibers are respectively fastened.

The rotation of gears 7 and 8 leads to a change in the angle f between the normals to the ends 9 and 10 of the optical fibers in the range of about 180 °.

The displacement measurement range is defined as the difference

PJ and minimum C distances from the following relationship:

R.-R. J :,

where R n r-p, L

 1 g maximum distance

f, from the middle of the first (second) fiber to the mirror 4, the minimum distance from / middle of the first (second)

fiber to mirror 4j × - the angle between the normal to the ends of the first 9 and second 10 fibers i

L is the width of the ruler of the second fiber.

The ability to adjust the angle f between the optically coupled first and second fibers allows the measurement range to be expanded.

Claims (1)

30 claims A fiber-optic sensor measuring the movement of an object, containing a radiation source, a sequentially installed first fiber, a mirror designed to be attached to the test object, a second light guide, a light receiver and a recording unit, which is equipped with two equally sized gear wheels, kinematically connected to each other, and each of them is attached to one of the optical fibers, respectively. yaL LUH / UXX /// XXX // X / X / / four/ x / xxx / yx / xx / x / yVX / icy-xx /