Degenerate pseudo-random rotary sensor

A rotary sensor and pseudo-random technology, applied in the direction of converting sensor output, using optical devices to transmit sensing components, instruments, etc., can solve the problems of circuit reliability decline, limited promotion, and complex discrimination circuits

Inactive Publication Date: 2007-03-21
李苏
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition to the complication of the circuit due to mixed use, this method can only be 2 n , which also limits further promotion (that is, the number of divisions of the circumference can only be a multiple of 2, otherwise it will not work)
3. In the literature, the idea of ​​degeneration is also used to adjust the data structure, but all of them use hard truncation, and the data will inevitably generate repeated codes.
Depending on the location and degradation data, this discriminant circuit can be quite complex
As the number of digits increases, the number of repeated codes also increases, and the reliability of the circuit decreases, which eventually becomes an undesirable solution.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1: A degenerated pseudo-random rotation sensor is composed of two parts: an optical-mechanical structure and a circuit.

[0045] As shown in Figure 6, the optomechanical structure of this embodiment is composed of a printed board 1 with a photodetector, a code disc 2, an indicating grating 3, a condenser lens 4, a light source 5, a bearing 6, and a main shaft 7. The connection relationship is as follows: The main shaft 7 is located on the rotation axis of the code wheel 2 and is fixedly connected with the code wheel 2 . The main shaft 7 is rotatably supported by the bearing 6 . The light source 5 , the condenser lens 4 , and the indicating grating 3 form a projected light path on the front of the code wheel 2 relative to the code track. The printed board 1 with a photodetector is located on the opposite side of the code disc 2, and its photodetector is facing the projection light path. When the shaft 7 drives the code disc 2 to rotate, under the action of th...

Embodiment 2

[0059] Embodiment 2: A degenerate pseudo-random rotation sensor, which consists of two parts: an optical-mechanical structure and a circuit.

[0060] The main difference from the first embodiment is that the encoding of the pseudo-code channel adopts a seven-bit binary degenerate pseudo-random sequence. Specifically:

[0061] Seven complete binary pseudo-random sequence M=2 7 =128

[0062] 0 111 1 111 0111 1100 1111 0101 1110 0011 1011 0111 0100 1110 0101 11000011 0110 0110 1010 1101 0001 1001 0011 0001 0110 0000 1010 1001 0100 00 10 0100 0100 00 00

[0063] The amount of degradation is 28, m=100

[0064] The underlined 28-bit code in the above-mentioned seven-bit complete binary pseudo-random code sequence is discarded, and the seven-bit degenerated binary pseudo-random code sequence with a degradation amount of 28 is obtained as follows:

[0065] 1111 0101 1110 0011 1011 0111 0100 1110 0101 1100 0011 0110 0110 10101101 0001 1001 0011 0001 0110 0000 1010 1001 01...

Embodiment 3

[0068] Embodiment 3: A degenerate pseudo-random rotation sensor, which consists of two parts: an optical-mechanical structure and a circuit.

[0069] The main difference from the first embodiment is that the encoding of the pseudo-code channel adopts an eight-bit binary degenerate pseudo-random sequence. Specifically:

[0070] Eight-bit complete binary pseudo-random sequence M=2 8 =256

[0071] 0 111 1011 0111 1010 0111 1001 0111 1000 0111 0111 0110 0111 0101 01110100 0111 1111 1 011 1111 0011 1110 1011 1110 0011 1001 1011 1001 0011 10001011 1000 0011 0110 1011 0110 0011 0101 0011 0100 1011 0100 0011 00 1 0010 1011 0010 0011 0001 0011 0000 1011 0000 0010 0101 0010 0100 00100010 1010 1000 1000 0010 1000 0000

[0072] The amount of degradation is 6, m=250

[0073] The underlined 6-bit code in the above-mentioned eight-bit complete binary pseudo-random code sequence is discarded, and the eight-bit degenerated binary pseudo-random code sequence with a degradation amount of ...

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Abstract

A degenerate pseudo-random rotation sensor is provided in the invention. The code disc is made up of a clock code track and a pseudo code track which is encoded in the whole circle by the binary pseudo-random sequence. It is: (1) it expresses the whole circle is divided into m parts by the closed ring composed by the m binary code sequence, the m is the positive integer; (2) the angle position code is the series of n binary code, the n is bigger than 4; (3) the m is less than 2n; (4) the angle position code is the only and the m different angle position codes are correspondence with the m angle position in the whole circle. The invention can save the space and the time by using the topological diagram to encode the circle pseudo-randomly. The photoelectric rotation sensor can provide the digital rotary parameter of the position, the speed and the direction at the same time; also it can keep the data reliability as the absolute formula.

Description

technical field [0001] The invention relates to a photoelectric rotary sensor for digital angle measurement, also known as a photoelectric shaft angle encoder. In particular, it relates to a photoelectric rotary sensor which applies degenerate pseudo-random coding technology to single-value the angular position of the circumference of the code disc to provide position, direction and speed signals. Background technique [0002] Photoelectric rotary sensor (also known as photoelectric shaft encoder) is a digital angle measuring device integrating light, mechanics and electricity. Because of its simple structure, high resolution and high precision, it has been widely used in precision angular position measurement, numerical control and digital display systems, and has become an ideal angle sensor. [0003] A typical photoelectric shaft encoder consists of a shaft system, a grating pair, a light source and a photoelectric receiving element. When the main grating rotates togeth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/347G01D5/38G01D5/26
CPCG01D5/34784
Inventor 李苏
Owner 李苏
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