SU568299A1 - Photoelectric transducer for control of linear and angular motions of object - Google Patents

Description

The drawing shows a diagram of the proposed Converter.

The converter contains a source of light 1, a condenser 2, a prism 3 lens 9, forming an optical system, a dash measure 5 on: which 6 strokes 6 are applied with a certain pitch, a lens 7 forming a projection system with the lens 4, a mirror 8 rotating drum 9 / installed, for example, on the spindle 10 and driven in rotation by an electric motor 11 through a belt transmission 12.

On the inner surface of the drum there is an immaculate coating 13 in which the strokes of the developmental circular raster 14 are cut, as well as the strokes of the reference circular raster 15 and the clock circular raster 16,

In addition, the converter contains a source 17 of light, a capacitor 18, a raster diaphragm 19 on which reference strokes 20 and clock strokes 21 are applied, lenses 22 and 23 projecting the indicated strokes on the reference circular raster and clock circular raster, respectively, of the diaphragm 24 and 25, trapezoidal shape, set in front of the sweep and clock circular rasters, photodetectors 26-28,

The drawing also shows graphs of the measuring signal 29, the reference signal 30 and the clock signal 31, respectively,

 Works photoelectric measuring transducer as follows.

When rotating drum 9, there is a periodic change in the intensity of the light fluxes incident on the photodetectors 26-28 as a result of the optical interaction of the projections of the strokes 6 of the measure 5, as well as the projections of the reference strokes 20 and the clock strokes 21 of the raster diaphragm 19, respectively, with the strokes of the circular raster 14, the reference circular raster 16 and the clock circular raster 15 of the drum. At the outputs of the photodetectors 26-28, there are periodic electrical signals - measuring signal 29, the reference signal 30 and the clock signal 31, Moreover, the periods of the measuring TcI of the reference TO signal are equal to each other, and the period of the clock T signal is many times smaller

When moving the stroke measure 5 on the value. X, is displaced in time by ty the measuring signal 29 relative to the reference signal 30. The magnitude of the movement of the stroke measure is determined by the number N j of periods

clock signal, filling the time interval tj (and, phase J of the measuring signal relative to the clock, t, e.

X - S (Nv-b-i) -.

360 T,

where S is the step of the stroke measure, 5 The information on the direction of movement of the stroke measure 5 and, consequently, of the object being monitored, is developed in the following way. If the direction of movement of the projection of the strokes 6 coincides with the direction of rotation of the drum 9, then the reference signal 30 is ahead in time of the measuring signal 29. Conversely, if the direction of movement of the projection of the strokes 6 is opposite to the direction

rotation of the drum 9, the reference signal 30 lags behind the measuring signal 29,

Claims (1)

Invention Formula A photoelectric measuring transducer for controlling linear and angular displacements of an object, containing a light source, an optical system and a line measure, located along the beam from a light source, arranged sequentially behind the line measure, a projection optical system, an opaque rotating drum with a measuring and transducer located on it element, clock and reference circular rasters with strokes and photodetectors, characterized in that, in order to increase f ACCURACY and speed, the measuring and converting element is made in the full sweep circular raster with strokes applied along the barGySan generators in conjunction with the strokes, clock and reference circular rasters, the projection optical system is made with a variable magnification factor, and the converter is equipped with trapezoidal diaphragms, installed in front of the sweep and clock circular rasters. IV L.