RU2247394C2 - Rotation speed pickup - Google Patents

Abstract

FIELD: automotive industry.

SUBSTANCE: pickup comprises housing, sensitive member which rotates around its axis, driving shaft, counter of the number of revolutions, analyzer, and fixing, directing and receiving lenses which connect the source and receiver of optical radiation through fiber optical cable. The sensitive member is made of optical plate with natural polarization mounted in the tube which rotates in bearings. The tube is connected with the driving shaft through a transmitting mechanism whose axis of rotation passes through the intersection of optical axes of the plate. The directing and receiving lenses are set in the guiding pipes.

EFFECT: enhanced accuracy of measurements.

3 dwg

Description

The speed sensor is designed for use in various industries, in particular in the automotive industry.

A device for measuring rotation speed is known. The device comprises a frequency sensor, an output DC voltage driver and a support element, moreover, according to the invention, a bipolar pulse former is connected to the input with the first output of the frequency sensor and a synchronous analog switch is connected to the output of the bipolar pulse former through the first input and the output of the adder, and the second input to the reference element, the third input to the control to the second output of the frequency sensor, and the output to the first input of the a generator of output DC voltage, the second input of which is connected to the second input of the adder and to the output of the support element, the output of which is the output of the device. The disadvantage of this device is low measurement accuracy and a narrow scope. (RF patent No. 2199752 (No. 2001100778), G 01 P 3/44, 2003.02.27).

A known speed sensor adopted for the prototype. The sensor contains an annular multipolar magnet located on the drive shaft, a magnetic induction comparator with an element sensitive to changes in the magnetic field located at the outer cylindrical surface of the multipolar magnet, and a permanent magnet located in the region of the sensitive element, which allows you to adjust the parameters of the sensor output signal by changing the magnitude induction of a constant bias magnetic field in the region of a sensitive element by moving a permanent magnet and / or its rotation around its axis. The disadvantage of this device is low measurement accuracy and a narrow scope. (RF patent No. 2190856, G 01 P 3/487, 2002.10.10).

The technical result of the invention is to increase the accuracy of measurements, as well as expanding the scope of applications of devices of this type.

The technical result is achieved in that the rotation speed sensor, comprising a housing, a sensing element rotating around its axis, a drive shaft, and a speed counter, according to the invention, is equipped with an analyzer, a focusing, a guide and a receiving lens, connecting the source and receiver of optical radiation with an optical fiber cable, moreover, the sensitive element is made in the form of an optical plate with a natural polarization mounted in a pipe rotating in bearings, connected to the transmission shaft of the transmission gear nism, the axis of rotation of which passes through the intersection of the optical axes of the plate, and the guide and receiving lenses are installed in the guide tubes and are located on the axis of rotation in the foci of each other.

The use of the proposed device in comparison with the prototype can improve the accuracy of measurements, as well as expand the scope of applications of devices of this type.

The rotation speed sensor is illustrated by drawings, in which Fig. 1 shows a longitudinal section of the device, section A-A, figure 2 shows section B-B, figure 3 shows section B-B.

The drawings show:

1 - housing;

2 - optical plate with natural polarization;

3 - pipe, the axis of rotation of which passes through the intersection of the optical axes of the plate with natural polarization;

4 - receiving lens;

5 - a directing tube of a receiving lens;

6 - a directing lens;

7 - a guide tube of a guide lens;

8 - bearing 1;

9 - bearing 2;

10 - gear;

11 - a drive shaft;

12 - feed fiber optic cable;

13 - receiving fiber optic cable;

14 - focusing lens;

15 - a source of polarized light radiation (for example a laser);

16 - photodetector;

17 - analyzer;

18 - counter speed;

19 - optical axis of the plate with natural polarization.

The rotation speed sensor comprises a housing 1 into which the tube 3 is rotatably inserted in bearings 8 and 9. An optical plate 2 with natural polarization is fixed in the pipe 3, the axis of rotation of the pipe 3 passing through the intersection of the mutually perpendicular optical axes 19 of the natural polarized plate 2 . The rotation to the pipe 3 is transmitted from the drive shaft 11 by a transmission mechanism 10. In the housing 1, a fiber optic cable 12 and a receiver 13 are fixed, a guide tube 5 of the receiving lens 4 and a guide tube 7 of the guide lens 6, and the axis of the tubes 5 and 7 coincide with the axis of rotation of the pipe 3. The guide lens 6 of the optical radiation source and the receiving lens 4 of the optical radiation are located on both sides of the plate 2 with natural polarization on an axis passing through the center of intersection of the optical axes 19 of the plate 2 with natural polarization. The guide lens 6 of the optical radiation source and the receiving lens 4 of the optical radiation are arranged in the foci of each other to ensure a sufficient size of the polarization field.

The speed sensor works as follows.

The operation of the rotation sensor is based on the principle of constant optical polarization in a material with natural polarization. When the plate 2 rotates, the polarization field created by the laser beam will simultaneously rotate. In the proposed design of the device, the plate 2 is placed in a tube 3, which rotates around its axis in bearings 8 and 9. On the tube 3 there is a transmission mechanism 10 connected to the drive shaft 11. A polarized light field is created by a source of polarized light radiation (for example, a laser) 15 using a focusing lens 14 through a feed fiber optic cable 12 to a guide lens 6, the reading of the rotating polarizing field is carried out by the speed counter 18 through the analyzer 17, the photodetector 16, the receiver the first fiber-optic cable 13 and the receiving lens 4. The speed of rotation is determined by the analyzer 17 using the speed counter 18 using the speed of rotation of the optical axes 19 of the optical plate 2 with natural polarization, which is a sensitive element fixed by the photodetector 16, by the analyzer 17.

The use of a speed sensor provides the following advantages:

- improving the accuracy, efficiency and reliability of measurements;

- expanding the scope of this type of device;

- the possibility of using the inventive device when operating drives for various purposes;

- remote signal removal from the device;

- the ability to implement automated continuous monitoring;

- the ability to work in explosive atmospheres.

Claims (1)

A rotation speed sensor comprising a housing, a sensing element rotating around its axis, a drive shaft, a revolutions counter, characterized in that it is equipped with an analyzer, a focusing, a guide and a receiving lens connecting the optical radiation source and receiver with a fiber optic cable, the sensitive element being made in the form of an optical plate with natural polarization mounted in a pipe rotating in bearings, connected to a transmission mechanism with a drive shaft, the axis of rotation of which passes through Without the intersection of the optical axes of the plate, the guide and receiving lenses are installed in the guide tubes and are located on the axis of rotation in the foci of each other.

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