SU720406A1 - Tachometer device - Google Patents

Description

I

The invention relates to a measurement technique and can be used for remote measurements of fluctuations in the speed of rotation within the limits of one revolution.

A tachometer device is known, which contains a light source, a mirror reflector mounted on the object under study, a slotted coding disk, a photodetector, and a resistor l.

The disadvantages of the known device are its comparative complexity, caused by the difficulty of making a coding disc with cuts, and the low accuracy of measurements of velocity fluctuations within one revolution.

Closest to the proposed tachometric device containing a light source, a mirror reflector mounted on the object under study, a photodetector and a recorder 2.

The known device is distinguished by its clear construction.

The disadvantage of it is the low accuracy of measurement of the rotation parameters caused by the small steepness of the fronts of the pulses received with its help.

The purpose of the invention is to improve the accuracy of the rotation parameters.

The goal is achieved by the insertion of an optical prism between a mirror reflector and a photodetector into a known device. Moreover, the prism can be made of several glasses with different refractive indices to speed up the measurement process.

FIG. 1 shows a diagram of the tachometer device; in fig. 2 shows the course of the light beams in the working prism; in fig. 3 - design of one of the variants of the working prism.

Claims (2)

The source contains a source I collimated light monochromatic (x: some light, such as a continuous laser, installed in front of a flat reflector 2, embedded vf on the object dimension 37 3. On the path reflected from the reflector 2 rays is pa (x) of part 4 with diffraction 5, for which the price range (jjoi-receiver 6, connected successively with the pulse-shaping unit 7 and the recorder 8 of measurement values). The device works as follows. The light beam reflected from the reflector 2 enters the workpiece npHONiy 4 from the hypotenuse the face of which it is reflected and refracted by absorbing with the diaphragm 5. When the angle of incidence of the light beam coincides with a critical value, a part of the light energy propagates along the hypotenuse face of the working prism in the form of the Wave Wave, on the way of which the photodetector 6 is placed. the effect is that when it falls at a critical angle from the optically denser medium to the border with the less optically dense medium, the light energy is not only reflected, but in the form of superficial light EMA rasprostratshets along the interface. Interacting with the interface of the media, part of the energy of the surface light wave leaving: he graduated back to the optically denser medium (see Fig. 2). When measuring the period of rotation of an object, the time between the pulses of the energy of the amphibious wave from one reflector at the leading (trailing) edge of the signal is measured. The number ofepOTOB object per second is determined by the formula. where t is the time between signals in mr-: ro- seconds, the fluctuation of the rotational speed of objects within a turn is determined by the difference of the instantaneous velocities measured at different angles of rotation of the flat reflector R d of measurements of the side wave energy impulses (front-back fronts) pos1ad.O It is possible to obtain a velocity distribution and determine the maximum deviations of the velocity of a leu gpak np width — the duration of the impulse energy of the side wave is determined by the velocity of the object and the angle of divergence: the light beam ( PICs nna value). In order to accelerate the measurement of velocity fluctuations, one can use several flat reflectors fixed along the perimeter of the object being measured, and also use a working prism made of several glasses with a different refractive index (see Fig. 3). In the latter version, the working prism ({jurM1forces several side waves corresponding to the critical angle X, but it is necessary to separate or spread the light beam of the beam, 1 a11 into the working prism. Claim 1. The tactile device containing a light source a mirror reflector fixed on The object under study, a photographic chic and a recorder, characterized in that, in order to improve the accuracy of measurement of rotation parameters, an optical prism is additionally introduced in it, which is located between the mirror reflector and 2, The device according to claim 1, which is based on the fact that the prism is made of several glasses with different refractive indices. Source information taken into account during the examination 1. Germany patent No. 1673421,42 about 13/10 (Q01 P 3/36) published, 1973. 2. The patent of Germany To 1957494, cl. & O1T) 21 / O4, published. 1975 (prototype).