Laser & Optoelectronics Progress, Volume. 57, Issue 3, 031202(2020)
Intensity Consistency Control Method for Multi-Wavelength Micro-Interferometry
This study presents a method for controlling the intensity consistency of multi-wavelength micro-interferometry. A white LED with tunable intensity is used as the multi-wavelength source. A detector is placed in the micro-interferometry optical path to detect intensity of light emitted from different filters, and the signal is fed back to an STM32 microcontroller in real time. Light intensities from different optical filters are quickly adjusted to be consistent using PID (proportion integration differentiation) control method and multi-wavelength interferograms with consistent gray distribution are obtained. The experimental results show that the presented method can quickly adjust the illumination intensity at different wavelengths, accurately stabilize at the set value, and reduce interferogram contrast error from 18% to 2%.
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Zhongsheng Zhai, Jiaojie Huang, Hang Zhao, Jinsong Li, Qinghua Lü, Xuanze Wang. Intensity Consistency Control Method for Multi-Wavelength Micro-Interferometry[J]. Laser & Optoelectronics Progress, 2020, 57(3): 031202
Category: Instrumentation, Measurement and Metrology
Received: Jun. 13, 2019
Accepted: Jul. 27, 2019
Published Online: Feb. 17, 2020
The Author Email: Zhai Zhongsheng (supersakula@163.com)