Method for highly accurately measuring absolute angle

Abstract

The invention discloses a method for highly accurately measuring an absolute angle, which facilitates the volume miniaturization and circuit simplification of measuring equipment to ensure that the measuring equipment is convenient to carry and can improve anti-interference performance and reliability. In the method, a green light source and a charge coupled device (CCD) linear array image sensor are correspondingly arranged on two sides of a single-code channel code disc; the code disc is provided with a position-fixed circular code channel; and codes for identifying angles are sequentially arranged along a circumference in the code channel. The method comprises the following steps of: acquiring image signals by using the CCD linear array image sensor, and performing decoding and image computation on the image signals respectively; obtaining the integer part of an angle value through decoding, and performing image computation by using a symmetric function fitting algorithm to obtain the decimal part of the angle value; and displaying the data. By the method, code channel codes 10 are more convenient to identify and cannot be repeated on the basis of a green light CCD highly subdivided digital single-code channel absolute coding disc 1; and received photoelectric signals have high quality and reliability, and an error code is difficult to generate.

Description

technical field [0001] The invention relates to an angle measurement method, in particular to a second-level high-precision absolute angle measurement method. Background technique [0002] Angle measurement is of great significance to human social life and the development of science and technology. Angle measurement technology has been applied in ancient astronomical observations. This ancient angle measurement technology is to measure angles by engraving angles on metal plates or glass plates. With the development of the development, both the precision and accuracy of angle measurement have been greatly improved. At present, people often use incremental grating digital angle measurement for angle measurement. This measurement method has the advantages of accurate precision and high degree of automation, but it The zero position must be set after each power-up, and only relative angles can be measured. There is also a multi-code channel absolute code disc for angle measurem...

AI Technical Summary

Problems solved by technology

[0002] Angle measurement is of great significance to human social life and the development of science and technology. Angle measurement technology has been applied in ancient astronomical observations. This ancient angle measurement technology is to measure angles by engraving angles on metal plates or glass plates. With the development of the development, both the precision and accuracy of angle measurement have been greatly improved. At present, people often use incremental grating digital angle measurement for angle measurement. This measurement method has the advantages of accurate precision and high degree of automation, but it The zero position must be set after each power-up, and only relative angles can be measured

There is also a multi-code track absolute code disc for angle measurement. This measurement method can perform absolute angle measurement, but it has the disadvantages of bulky, complex structure, and poor reliability.

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