Acta Optica Sinica, Volume. 40, Issue 7, 0701001(2020)
Experiment on Optical Path Difference of Supersonic Semi-Free Jet
Herein, the optical path difference (OPD) distribution of supersonic semi-free jet under different total pressure conditions was investigated in a vacuum chamber to address the problem of reduction of image quality attributed to the non-uniform distribution of jet refractive index field. The angle between the main optical axis of the three optical paths and the flow direction was 81°, 90°, and 99°. Experimental results show that larger total pressure corresponds to larger OPD of the jet. Under the same total pressures, the OPD of the 81° optical path is larger than the 99° and 90° optical paths. An empirical polynomial of the OPD along the flow direction was deduced, and the applicability of two theoretical models in the jet flow field was also analyzed.
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Xinhai Zhao, Shihe Yi, Haolin Ding, Feng Zhang, Long Jin. Experiment on Optical Path Difference of Supersonic Semi-Free Jet[J]. Acta Optica Sinica, 2020, 40(7): 0701001
Category: Atmospheric Optics and Oceanic Optics
Received: Oct. 17, 2019
Accepted: Dec. 23, 2019
Published Online: Apr. 15, 2020
The Author Email: Zhao Xinhai (mailto:18773129527@163.com)