Opto-Electronic Engineering
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Vol. 46, No. 10, 2019
Cover Story:Chen Wei, Wu Yue, Luo Jie, et al. Theoretical research of point-measurement laser absorption spectroscopy[J]. Opto-Electronic Engineering, 2019, 46(10): 180575

When the vehicle’s speed is higher than the sound velocity, the air before will be compressed and a shock wave appears. In hypersonic situation, the Mach number exceeds 5, the gas temperature behind the shock wave is very high and the gas vibration, dissociation, ionization, chemical reaction are exited.
A team led by Dr. Chen Wei from the Hypervelocity Aerodynamics Institute of China Aerodynamics Research and Development Center (CARDC), who devote to the optical spectrum research of hypersonic flow, innovatively developed the saturated absorption spectroscopy under studying the foreign advanced techniques. In their method, sub-millimeter spatial resolution could be achieved by the named point measurement laser absorption spectroscopy (PMLAS) with crossing a frequency synchronized saturation beam to the probe beam, which has good application prospect in diagnosis of the non-uniform, unsteady and un-equilibrium high-temperature gas flow.
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Liu Huaiguang, Kong Jianyi, Yang Jintang, et al. An edge fitting method for the online measurement of lithium battery coating[J]. Opto-Electronic Engineering, 2019, 46(10): 180563. 
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Chen Wei, Wu Yue, Luo Jie, et al. Theoretical research of point-measurement laser absorption spectroscopy[J]. Opto-Electronic Engineering, 2019, 46(10): 180575. 
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Ye Song, Bai Yunfei, Li Zhiwei, et al. Design of visibility detection system for tunnel based on transmission method[J]. Opto-Electronic Engineering, 2019, 46(10): 180607. 
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Tang Biao, Jin Wei, Li Gang, et al. The cloud retrieval of combining sparse representation with subspace projection[J]. Opto-Electronic Engineering, 2019, 46(10): 180627. 
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