SU1120241A1 - Rotational speed photoelectric transducer - Google Patents

Abstract

PHOTOELECTRIC speed sensor comprising a housing, an obturator in the form of an opaque disk with apertures aakreppennogo on the shaft of the test engine, drive motor, diaphragm, and two opto pairs, one of which is optically aligned through the diaphragm, and the other through a hole in an opaque disk, wherein T §M that, in order to increase the accuracy and reliability of the sensor, the diaphragm is designed as an additional obturator mounted on the drive motor shaft, while the sensor is equipped with a light guide, one end which is mounted on the additional obturator opposite the hole in the opaque disc of the first obturator, and the other on the axis of rotation of the additional obturator, while the photodetector of the first optocoupler pair is located on the optical axis of the optical fiber, and its radiation (ring made.

Description

one

The invention relates to measurement technology and automation and can be used for. converting rotational frequencies of various drives into an electrical signal.

A photoelectric rotational speed sensor is known comprising a housing, an obturator in the form of an opaque disc with holes, fixed on the motor shaft, a drive motor, a diaphragm and two optocouplers, one of which is optically matched through the diaphragm, and the other through an opening in the opaque disc II,

Optocouplers. In a known sensor mounted on the rocker drive motor and require the presence of current collectors to remove information from the photodetectors, which reduces the accuracy and reliability of the device.

The purpose of the invention is to improve the accuracy and reliability of the photoelectric rotational speed sensor.

The objective is achieved by the fact that in a photoelectric rotational frequency sensor comprising a housing, an obturator in the form of an opaque disk with holes fixed on the shaft of the engine under study, a driving motor, a diaphragm and two optocouplers, one of which is optically matched through the diaphragm and the other through the hole in the opaque disk, the diaphragm is made in the form of an additional obturator mounted on the drive motor shaft, while the sensor is equipped with a light guide, one end of which is fixed to the additional The obturator is directly opposite the hole in the opaque disc of the first obturator, and the other on the axis of rotation of the additional obturator, while the photodetector of the first optocoupler pair is located along the optical axis of the optical fiber, and its emitter is annular.

Figure 1 shows the device, a general view; figure 2 - timing diagrams.

The device (Fig. 1) consists of an input shaft 1 connected to a Kontrolled object, on which an obtorto 2 with aperture 3 is strengthened. On the body 4 of the device, the emitter 5 and the photodetector 6 of the main optocoupler are fixed;

through the hole 7 in the additional obturator 8. The emitter 9 of the additional optocoupler pair in the form of an electrolayer 5 of the low-voltage panel optically connected through the opening 3 in the obturator 2 and the light guide 10, which is brought out at the end of the shaft 11 of the additional obturator against the photodetector 12, 10, is mounted in the case 4. secured in the housing 4. The additional obturator 8 is kinematically connected with the additional motor 13.

The device works as follows 15 times.

When the input shaft 1 and the drive motor shaft 11 rotates in the same direction with the rotational frequencies CO and WflCUo (O,) 20, respectively, the light flux from the emitter 5 once per turn of the additional obturator 8 through the aperture 7 irradiates the photodetector 6. The luminous flux of the emitter 9 through the aperture 3 in the main obturator 2 through the optical fiber 10 is supplied to the photodetector 12,

The first and second pulses are formed two turns of the additional obturator 8 by the photodetector 6, respectively, at times t THEIR;} and are shown in FIG. 2. The first and second pulses of the photodetector 12 are formed at times tj and: c

Figure 2 shows the formed time intervals Ta, which constitute the functions of the rotational speeds of the input shaft (the object being monitored).

The frequency of rotation of the input shaft is proportional to the time interval T 5 and is determined by the expression

- (vvlb ;,).

The resulting time intervals T and Tg are filled with the reference frequency pulses, the pulses are subtracted, and the information about the rotational frequency of the object being monitored can be output in a digital code or using a digital-to-analog converter to an analog signal. 1 In the proposed device, the elimination of optocouplers from a rotating object will reduce the information losses and interferences generated during switching and thus increase the accuracy of measurements and the reliability of its operation.

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Claims (1)

A PHOTOELECTRIC ROTATION SENSOR, comprising a housing, an obturator in the form of an opaque disk with holes fixed to the shaft of the engine under investigation, a drive motor, a diaphragm and two optocoupler pairs, one of which is optically aligned through the diaphragm and the other through an opening in an opaque disk, different m, which, in order to improve the accuracy and reliability of the sensor, the diaphragm is made in the form of an additional shutter mounted on the shaft of the drive motor, while the sensor is equipped with a light guide, one end of which mounted on an additional obturator opposite the hole in the opaque disk of the first obturator, and the other on the axis of rotation of the additional obturator, while the photodetector of the first optocoupler pair is located on the optical axis of the fiber, and its emitter is circular.