New method for improving angle measurement precision of laser collimation system under complex background

Xiaofeng Zhao; He Chen; Lilong Tan; Zhili Zhang; Wei Cai

doi:10.1117/12.2068580

18 September 2014 New method for improving angle measurement precision of laser collimation system under complex background

Xiaofeng Zhao, He Chen, Lilong Tan, Zhili Zhang, Wei Cai

Author Affiliations +

Proceedings Volume 9282, 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment; 92821I (2014) https://doi.org/10.1117/12.2068580
Event: 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2014), 2014, Harbin, China

Abstract

We have proposed a new method for improving angle measurement precision based on the principle of CCD laser collimation in this paper. First, through the control of the laser’s state, on or off, by the Digital Signal Processor (DSP), the collimation light and the background light can be sampled, individually. Second, with the comparison between the sampled value of the background light intensity and the threshold value which has been set in the DSP previously, the DSP can automatically control Complex Programmable Logic Device (CPLD) to adjust the light integral time of CCD to adapt to different environment background and the changeable scanning driver of CCD is realized. Last, by the digital wave filtering the impact of the background light on the collimation light can be removed. With the comprehensive application of the controlling technology of automatically changeable scanning driving, collimation light on or off, A/D conversion and adaptive filtering, the integration time of the collimation system can automatically adjust to the proper value according to the change of the environment and the impact of the background light on the collimation system can be well removed. The simulation results show that the new method can achieve the self-adaptable control with the change of the environment and can improve the measurement precision of the laser collimation system under the complex environment.

Citation Download Citation

Xiaofeng Zhao, He Chen, Lilong Tan, Zhili Zhang, and Wei Cai "New method for improving angle measurement precision of laser collimation system under complex background", Proc. SPIE 9282, 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 92821I (18 September 2014); https://doi.org/10.1117/12.2068580

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KEYWORDS

Charge-coupled devices

Collimation

Digital signal processing

Control systems

Laser systems engineering

Semiconductor lasers

Environmental sensing

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