Eighth Symposium on Novel Photoelectronic Detection Technology and Applications
Laser Doppler, closed-loop feedback, voltage controlled constant current source,
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.