A control method for laser drive system in laser Doppler velocimetry

Yanan Li; Xiaoguang Qi; Xianglong Hao; Ran Song; Chi Wu

doi:10.1117/12.2627134

27 March 2022 A control method for laser drive system in laser Doppler velocimetry

Yanan Li, Xiaoguang Qi, Xianglong Hao, Ran Song, Chi Wu

Proceedings Volume 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications; 12169C3 (2022) https://doi.org/10.1117/12.2627134
Event: Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 2021, Kunming, China

Abstract

To meet the requirements of miniaturization, low cost and high stability of Laser Doppler seawater velocity measurement, a closed-loop feedback laser drive method was studied to achieve a voltage-controlled constant current source based on operational amplifier. The temperature of the laser was collected and controlled by thermal-electric-cooler (TEC). Proportional-Integral-Differential (PID) algorithm was used to set the temperature, so as to realize the closed-loop control of the temperature. The experimental results show that the output optical power of the system was remarkably correlated linearly with the control voltage amplitude at temperature of 25℃, the optical power fluctuation was less than 0.4mW and the wavelength fluctuation was 7pm at the same tuning voltage. The size of the system was 102mm×65mm with a high stability.

Citation Download Citation

Yanan Li, Xiaoguang Qi, Xianglong Hao, Ran Song, and Chi Wu "A control method for laser drive system in laser Doppler velocimetry", Proc. SPIE 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 12169C3 (27 March 2022); https://doi.org/10.1117/12.2627134

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