SU991154A2 - Device for measuring object displacement - Google Patents

Description

(54) DEVICE FOR MEASURING OBJECT DISPLACEMENTS

The invention relates to instrumentation engineering and can be used in the field of acoustic measurements to convert high frequency acoustic oscillations into an electrical signal.

On the main auth, sv. No. 913055 discloses a device for measuring the movements of an object, comprising successively installed coherent radiation sources, a planar two-beam interferometer, a recording unit and a flat sensitive element with an electrically conductive surface fl 1.;

A disadvantage of the known device is the small dynamic range of the measured displacements due to the nonlinearity of the static transformation characteristic of the device.

The purpose of the invention is to expand the dynamic range of the measured displacements.

To achieve the goal, the device is provided with a plate of conductive material, one end of which is hinged to the sensing element. tom and the other end with the surface

planar interferometer through a sliding hinge.

FIG. 1 shows a diagram of the device; in fig. 2 - the same, top view.

The device contains, after a sequential installation, a coherent radiation source 1, a planar dual-beam interferometer 2 consisting of a radiation input unit 3, a planar waveguide 4, a beam splitter 5, reflectors b and 7, a mixer 8, an absorber 9 and a radiation outlet 10, registration block 11 , a flat sensing element 12 with an electrically conductive surface 5, oriented parallel to the plane of the interferometer, and a plate 13 of conductive material, one end of which is hinged to the sensing element 12 and the other end with the surface of the planar interferometer 2 through a sliding hinge (not shown).

The device works as follows.

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Claims (1)

Optical radiation from the radiation source 1 is inputted into the planar waveguide 4 by the radiation input unit 3, two beams are separated by a beam splitter, combined on the mixer 8. With the help of the output unit 10, the combined beam is output from the planar of the waveguide 4 and is fed to the registration unit 11 . The absorber 9 prevents the occurrence of a PA; reflections. In the initial position between the reference and signal beams, there is a certain phase difference determined by the difference from the optical paths. The presence of a plate 13 of conductive material located at a predetermined angle ot to the surface of the planar interferometer 2 in the region of passage of one of the rays of interferometer 2 changes the value of 11th of the surface wave propagation in the waveguide 4. When the sensitive element 12 is displaced, the angle сС T, which leads to a change in the constant propagation of the surface wave and, accordingly, the difference of Pha & interferometer 2, this results in the curing of the characteristics of the device's design, which allows an increase in the dynamic range of the measurements of displacements due to the expansion of the linear portion of the characteristic. Instead of the absorber 9, you can use an additional registration unit (not shown). Thus, the insertion of a conductive material plate arranged in this manner allows the dynamic range of the measured displacements to be expanded. The invention of the device for measuring the movement of an object by author. St. 913055, characterized in that, in order to broaden the dynamic range of the measured sweeps, it is provided with a plate made of conductive material, one end of which is hinged to the sensing element and the other end to the surface of the planar interferometer through a sliding hinge. taken into account during the examination 1. USSR author's certificate 913055, cl. G 01 B 9/02, 1980 (prototype). ± f