SU402807A1 - DEVICE FOR MEASURING THE UNEVENESS OF ROTATION SPEED - Google Patents

Description

one

The invention relates to the field of measurement and control of motion parameters.

Devices for measuring rotational velocity unevenness are known, comprising a signal pickup sensor in the form of an inclined disk mounted on the shaft under study with a reflective end surface and a reading device.

The purpose of the invention is to increase the measurement accuracy within one revolution.

This is achieved by the fact that, in the proposed device, the pickup sensor is equipped with a photoelectric interferometer with a light source and optical converters, while a radial slit is made in the inclined disk for fixing the origin.

The drawing shows a schematic diagram of the described device.

On a rotating shaft 1 of the object under study, a disk 2 has a sharp angle of inclination, having a reflective surface A and a radial slot B. Before the disk 2 there is a photoelectric interferometer consisting of a monochromatic light source 3, a slit 4, a light filter 5, lenses 6 and 7, a translucent plate 8, a plane-parallel plate 9, a slit diaphragm 10 and a photocell 11. A device for fixing the reference point is installed in front of the radial slot B, for example, an additional illuminator 12 and a photocell 13. After the day is connected via amplifier 14 to the start-stop cascade 15. The reference frequency generator 16 is through the start-stop cascade 15 and the counter 17 is connected to the phase discriminator 18, to which a photocell 11 is connected via a pulse amplifier 19. Next, the phase discriminator 18 is through demodulator 20 connected to the reading device 21.

The device works as follows.

The telecentric monochromatic beam of light formed from the source 3 by means of the slit 4, the light filter 5 and the lens 6, reflected from the plate 8, hits the surface B of the plane-parallel plate 9 and the surface A of the disk 2. The light beam passing perpendicularly to the surface The reflection from it is also perpendicular. A ray of light falling on surface A,

reflected from it under the zglom. Since the rays converge at a point on the plane of the slit diaphragm 10, the interference field is observed in the plane B. In the plane of the slit diaphragm 10 there is an image of the interference field. The dark zones in the interference field are observed at / rj / r--, where l -

light wavelength; k 1,2, 3 ... When the drive shaft 1 comes up with disk 2, the magnitude changes

fi. From this, the illumination in the interference field changes, to which the photocell I responds, emitting a corresponding signal from the interference measuring element. When slot B of disk 2 passes by the device for fixing the origin, a pulse is generated in the photocell circuit 13, which controls the start-stop cascade 15. The generator 16 outputs the signals of the reference frequency, which flow through the start-stop cascade to the counter 17, and the gates from the last go to the phase discriminator 18. Along with the supply of gates from the counter to the discriminator signals are received from the interference measuring element. With the help of the zero phase of the signal-measuring link, the discriminator divides the reference frequency gates into two half-strobe. With an uneven rotation of the shaft 1, the phase of the signal of the measuring link changes relative to the phase of the reference gates, as a result of which the discriminator output half-strokes are modulated, the output

the signals from which are fed to the demodulator 20, and the variable component of the voltage removed from the demodulator by the reading device 21, characterizes the unevenness of rotation within one revolution.

Subject invention

An apparatus for measuring uneven rotational speed, comprising a signal pickup sensor in the form of an inclined disk mounted on the shaft under study with a reflective end surface and a reading device,

characterized in that, in order to improve the measurement accuracy within one revolution, the removal sensor is equipped with a photoelectric interferometer with a light source and optical converters, with a radial slit in the inclined disk for fixing the origin.