Research on coherent dual-frequency lidar detection technology for hypersonic target

Liu Xiaoming; Zhao Changming; Zhang Zilong

doi:10.3788/IRLA201948.1105005

In order to study the application of dual-frequency lidar in the detection of hypersonic target, the absorption and attenuation characteristics of laser in plasma were analyzed theoretically. Based on the measured data of RAM-C experiment, the plasma electron density of blunt body model in different hypersonic flight scenarios was obtained by simulation calculation, which verified the accuracy of the calculation. The temperature distribution on the stationary line of blunt body was calculated from 8 000 K to 16 000 K, and combined with theoretical analysis we can obtain laser attenuation in plasma sheath on electron density, temperature and laser frequency, which showed that the absorption of laser by plasma sheath was very small. By comparing the echo signal to noise ratio of dual-frequency laser and single frequency laser in turbulent transmission, the anti-turbulence characteristics of dual frequency laser were obtained. Thus shows that the dual-frequency lidar is an effective way to detect the hypersonic target.

Research on coherent dual-frequency lidar detection technology for hypersonic target

1. School of Optics& Photonics,Beijing Institute of Technology,Beijing 100081,China;

2. Key Laboratory of Photonic Information Technology,Ministry of Industry and Information Technology,Beijing 100081,China

Received Date: 2019-07-11

Rev Recd Date: 2019-08-21

Publish Date: 2019-11-25

Key words:

Abstract: In order to study the application of dual-frequency lidar in the detection of hypersonic target, the absorption and attenuation characteristics of laser in plasma were analyzed theoretically. Based on the measured data of RAM-C experiment, the plasma electron density of blunt body model in different hypersonic flight scenarios was obtained by simulation calculation, which verified the accuracy of the calculation. The temperature distribution on the stationary line of blunt body was calculated from 8 000 K to 16 000 K, and combined with theoretical analysis we can obtain laser attenuation in plasma sheath on electron density, temperature and laser frequency, which showed that the absorption of laser by plasma sheath was very small. By comparing the echo signal to noise ratio of dual-frequency laser and single frequency laser in turbulent transmission, the anti-turbulence characteristics of dual frequency laser were obtained. Thus shows that the dual-frequency lidar is an effective way to detect the hypersonic target.

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Reference (14)

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Research on coherent dual-frequency lidar detection technology for hypersonic target

doi: 10.3788/IRLA201948.1105005

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