SU932226A1 - Device for measuring small angular displacements of coherent radiation source - Google Patents

Description

one

The invention relates to instrumentation technology and can be used when measuring y-waves using wave radiation, mainly in automated systems for monitoring and controlling complex objects, as well as when carrying out fine-tuning and adjustment work with precision accuracy.

A device is known based on a discrete indication of the angle of rotation of a mirror by fixing a multiply reflected light beam at the output of a mirror multiplier and containing a light source, a mirror multiplier and a photodetector. However, such a device does not respond to the direction of the measured angular displacement.

Closest to the proposed technical entity is a device for measuring small angular displacements of a source of coherent radiation, which contains an optically coupled film waveguide with an integrated-optical communication element, a fiber mosaic receiver, and a phototransducer. The input of the fiber mosaic receiver is connected to the first (one) output end of the film waveguide, and the output is connected to a photoconverter. As an integral.optical element of communication, a prism element of communication is used.

A disadvantage of this device is the complexity of the design, which requires the precise adjustment of the air gap between the prism coupling element and the film waveguide during production and operation, since the modes excited in the waveguide depend on the gap size. In addition, the device has not enough high accuracy

20, since vibrations, accelerations and shock loads greatly affect the operation of the device. The device has a limited measuring range, since the range of angular displacements of the beam of the coherent radiation source is subject to additional restrictions associated with the reflection and refraction of the beam on the surface of the prism coupling element.

The purpose of the invention is to expand the range and increase the measurement accuracy.

Claims (2)

The goal is achieved due to the fact that the device is equipped with a second fiber mosaic receiver, the input of which is connected to the second output end of the film wave-water, the output is connected to the phototransducer and the integrated-optical communication element is made of a grating. FIG. 1 shows a block diagram of a device for measuring small angular displacements of a coherent radiation source; FIG. 2 - the course of the light beam when the mode is excited in a film waveguide. The device contains a film waveguide 1 with a grating integrated optical element 2, fiber mosaic receivers 3 and C and photo converter 5; Inputs of fiber mosaic receivers 3 and connected to the output ends of film wave-water 1, and outputs with a photoconverter: 5 Film waveguide 1 . is applied to the substrate 6. The grating integrated optical communication element 2 is made in the form of a dielectric layer 7 with a corrugated grid 8 applied to the film waveguide 1. The fiber mosaic receivers 3 and 4 are made in the form of optics components with regular fiber laying. Photoconverter 5 is an array of photodetectors based on charge-coupled devices. The device works as follows. A beam 9 of light from a coherent radiation source (not shown) is incident on the grating integrated-optical communication element 2. Upon hitting the corrugated grating 8, the light beam 9 excites in the film waveguide 1 a waveguide mode 10, the order of which depends on the angle of incidence of the beam on the grating integrated optical communication element 2. The waveguide mode 10 of this order corresponds to a certain distribution of the light field at one of the output ends of the film waveguide 1, depending on the direction of incidence of the beam of light 9. This picture of the light field is transmitted by the fiber mosaic receiver 3 or k to the photoconverter 5. Thus, an optical signal is received in the photoconverter 5, indicating a mode 10 in the waveguide film. a certain order, which corresponds to a certain angle of incidence of the beam of light 9, and hence a certain position of the source of coherence radiation. When the source of coherent radiation is rotated, the angle of incidence of the light beam on the grating integrated optical element 2, the order of the waveguide mode in the film waveguide 1, the distribution pattern of the light field at one of the output ends of the waveguide 1, and the photoconverter reading 5 change. by waveguide modes, one can judge the magnitude of the angular displacements. no source of coherent radiation. Expansion of the range and improvement of measurement accuracy is achieved by the fact that the grating integrated-optical communication element has a symmetrical design and the measurement range is divided into half as short intervals. Apparatus of the Invention A device for measuring small angular displacements of a coherent radiation source, comprising an optically coupled film waveguide with an integrated optical communication element, a fiber mosaic receiver and a phototransducer, the input of a fiber mosaic receiver is connected to the first output end of the film waveguide, and the output is connected to a photoconverter, characterized in that, in order to expand the range and increase the measurement accuracy, it is equipped with a second fiber mosaic receiver, whose input is connected en with the second output end of the mini 59322266 waveguide output - with photoconversion-1. USSR author's certificate gel, and the integrated optical element No. 208991, cl. G 01 B 11/26, 1968, the communication ment is made lattice, 2. USSR author's certificate Information sources, according to application number 2713525 / 25-28, taken into account in the examination of s: Cl, G 01 B 11/26, 1980 (prototype). mnJrnJlJTJlJnj X / x / / / / / / X //// X / fa 2 FIG. one  /