Speaker
Description
In the process of adjusting and setting up optical telescopes and short-wave radio antennas, when checking the straightness of the axes of large-sized hollow cylindrical products, as well as in large-scale mechanical engineering and aircraft engineering, it is necessary to measure broken lines in arbitrary planes. For this purpose, a light rangefinder and a reflector are installed, as in conventional measurements, at the beginning and end of the lines, and at the points of its break, rotary deflecting mirrors are installed. On broken lines, the operation of the compensatory light rangefinder is disrupted. In this regard, it is proposed to use amplitude-modulated light, the phase detection of which is carried out by the reference optical channel. Moreover, phase detection is carried out independently of the processes occurring in the cathode chamber of the photoelectron multiplier.
It has been shown that when the voltage on the light modulator crystal is sharply reduced, and the light modulation characteristic becomes linear, the position of the minima of the observed signal becomes sharply narrowed, which makes it possible to build high-precision light rangefinders for measuring broken lines.