SU1527490A1 - Optical sensor for device for measuring linear displacements - Google Patents

Abstract

This invention relates to instrumentation technology. The aim of the invention is to increase accuracy and sensitivity by increasing the output signal when the object is displaced. For this, the transceiver unit is made in the form of three optical fibers, the central one of which is optically coupled to the radiation source, and the extreme ones are located symmetrically to the optical axis of the central light guide and optically coupled to the photodetectors, and optically coupled to the reflector, made in the form of a regular U-fiber optic. shaped shaped symmetrically with respect to the axis of the central fiber. This embodiment of the sensor elements provides a doubling of the number of exposed ends of the fibers at a single displacement of the object on which the reflector is fixed. 2 Il.

Description

And (the acquisition refers to the control rt. () H technique and can be used-: ii) HHHn when measuring the movements and vibrations of the summer. To th machines and mechanisms.

The aim of the invention is to improve the accuracy and sensitivity by increasing the output signal at offset.

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Ma Fig 1 shows the optical sensor in the initial position; in fig. 2 - the path of the rays in the optical.m sensor at offset

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Optically, the sensor consists of a fiber optic transmitting node, made (lh) in the form of three regular optical fibers I 3, the ends of which are arranged in a ruler, the central light guide I is intended for optical communication with the radiation source, the outer optical fibers 2 and 3 are arranged symmetrically with respect to the optical axis of the central light guide 1 and are intended for optical communication with a photodetector and an optically coupled reflector. made in the form of a regular 4-shaped optical fiber, the ends of which are laid into a / reaper, whose width is less than the width of the line of the ends of the optical fibers I-3, is oriented so that the line of its ends is parallel to the line of the ends of the optical fibers 1 - 3 receiving and transmitting nodes, and placed symmetrically with respect to the axis of the central optical fiber 1, reference numeral 5 denotes a radiation source optically coupled to the input end of the central optical fiber 1, and positions 6 and 7 designate photodetectors optically coupled to the output ends of the optical fibers 2 and 3, respectively.

The optical sensor works as follows.

The light from the radiation source 5 is transmitted to the optical fiber 1 to its output end, where it is divided into two beams, incident on the left and right ends of the optical fiber 4. These beams, passing through the optical fiber 4 towards each other, exit through this optical fiber. In the equilibrium position, when the ends of the light guide 4 are located symmetrically relative to the axis of the light guide 1 (Fig. 1), with

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the condition of the total internal reflection in the elementary fibers of the light guide 4, both light beams completely fall on the end of the light guide I, through which they are diverted. At the input ends of the light guides 2 and 3, the light does not fall, therefore, the light fluxes at their output |) i and 12 are equal to zero. This is recorded by the photodetectors 6 and 7. When the V-shaped light guide 4 is shifted to the left of the position of the same V-shaped light guide 4 to the right of the equilibrium position by the value of x, the device functions in the same way.

Claims (1)

Invention Formula An optical sensor to a device for measuring linear displacements, containing optically coupled optical waveguide by an amount X (Fig. 2), a light Yu transmitting unit and a reflector intended for a beam. a light beam falling on the left end for attachment to the object, tilted 4, is smaller than the light beam, given by the fact that, in order to increase at the right end of this fiber, as well as sensitivity and sensitivity, the receiver-re-distribution spreads along it the numbering node is made in the form of three re-elementary fibers of the light guide 4, and the optical fibers, the ends of which are laid closer to its axis of symmetry. The optical fibers, therefore, pass through the optical fiber 4. This PU is assigned to the optical communication with the source reaches the input end of the optical fiber 3, with the name of the radiation, the outermost of which is a symbol of which 1. (). .4 the light beam, metric about the optical axis, is centered on the right end of the light guide 4, the light wave guide and are intended for spreads over a greater number of optical communication elements with photodetectors, from the tare fibers of this fiber, and the reflector is made in the form of a regular, V-shaped symmetrical tovod closer to its axis, the ends of which The V-shaped light guide 4 to the right of the equilibrium position on the value x the device functions in the same way. Invention Formula rii therefore, it has reached the nuv of the left end of the light guide 4, it illuminates the ends of the fibers laid out in a ruler whose width is smaller than the width of the ruler of the ends of the optical fibers of drive 2 with coordinates not larger than e 2x. „From the dark-transmitting node, is oriented so. Thus, moving the fiber 4, the line of its ends parallel to the line of the ends of the optical fibers of the receiving and transmitting node, and being symmetrically shifted to the left of the equilibrium position, causes a double increase in the number of illuminated fiber ends of the fiber 2, which is recorded by the photodetector 6. When offset but the axis of the central fiber of the transmitting node. placed in a ruler, the width of which is less than the width of the ruler of the ends of the optical fibers with the axis of the central fiber of the receiving-transmitting unit. Ф, - Ф, 1гх) 1