High-precision grating positioning device and method of spectrum analyzer

Abstract

The invention discloses a high-precision grating positioning device and method of a spectrum analyzer. The positioning device comprises a motor driving circuit, a DC brushless motor, a diffraction grating, a photoelectric encoder and a feedback control circuit in serial connection successively, the output end of the photoelectric encoder is connected to the input end of an interpolation circuit, a CPU main control circuit is connected with the feedback control circuit, and a rotor of the DC brushless motor is directly fixed to a rotating shaft of the diffraction grating. The device and method have the advantages that the DC brushless motor is selected to replace a stepping motor, direct driving is realized, the position of a grating angle can be directly read, and the device is also rapid, firm, small, free of return difference and not sensitive to wearing or environment change.

Description

technical field [0001] The invention relates to the technical field of grating positioning for spectrum analyzers, in particular to a high-precision grating positioning device and method for spectrum analyzers. Background technique [0002] At present, due to the advantages of large transmission capacity, high transmission rate, anti-electromagnetic interference, and strong confidentiality, optical fiber communication technology has been rapidly developed and widely used in various fields such as military, industry, agriculture, medical treatment, and scientific research. The grating rotating spectrum analyzer is the most common optical frequency domain measurement instrument in the optical fiber communication system, and its wavelength tuning is controlled by the angular position of the diffraction grating of the spectroscopic unit. The incident light beam is collimated by the collimating parabolic mirror and irradiated on the diffraction grating, and different lights diver...

AI Technical Summary

Problems solved by technology

But it has the following disadvantages: First, the speed becomes slow. If the reduction ratio is M, the speed and acceleration of the grating are only 1 / M of the motor speed and acceleration. Rotating the grating at any speed requires the motor and gear train to be accelerated to At very high speeds, changing the direction of rotation of the grating requires the motor and gear train to decelerate and accelerate them in the opposite direction to high speed

The second is that the return difference is obvious. There are many technologies used to reduce the return difference of the system. In principle, these methods allow the gear trains to engage in sequence to ensure that they remain in contact with the tooth surfaces on the same side regardless of the direction of rotation. These technologies are useful Helps, but does not completely eliminate backlash, for high-resolution systems, some backlash angles are still noticeable

Third, it is sensitive to errors caused by wear or changes in environmental conditions

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