Dr. Pan Li Profile

Dr. Pan Li

at Institute of Beijing Aerospace Control Device

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Publications (2)

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Proceedings Article | 12 March 2019 Paper

Analysis of mode instability in DFB fiber laser hydrophone array

Haiyan Zhang, Baichao Zheng, Pan Li, Zhen Li

Proceedings Volume 11023, 1102358 (2019) https://doi.org/10.1117/12.2522017

KEYWORDS: Acoustics

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In order to increase the multiplexing capacity and optimize the noise level and power of distribute feedback fiber laser hydrophone array, the factor of the mode instability has been studied. Mode instability characteristics of DFB fiber laser hydrophone due to multiple external reflections is modeled, and the dependent condition and suppression method of DFB fiber laser array is carefully analyzed. It can be concluded that the mainly reason for the mode instability of the DFB fiber laser hydrophone array is related to the mode splitting caused by external cavity feedback light reflected by the fiber connector, and the reduction of fiber flange connector reflectivity can effectively suppress the mode instability.

Proceedings Article | 25 October 2017 Paper

Research on propane leak detection system and device based on mid infrared laser

Meng Jiang, Xuefeng Wang, Junlong Wang, Yizhao Wang, Pan Li, Qiaoling Feng

Proceedings Volume 10464, 104641Y (2017) https://doi.org/10.1117/12.2285574

KEYWORDS: Mid-IR, Modulation, Laser spectroscopy, Calibration

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Propane is a key component of liquefied petroleum gas (LPG) and crude oil volatile. This issue summarizes the recent progress of propane detection technology. Meanwhile, base on the development trend, our latest progress is also provided. We demonstrated a mid infrared propane sensor system, which is based on wavelength modulation spectroscopy (WMS) technique with a CW interband cascade laser (ICL) emitting at 3370.4nm. The ICL laser scanned over a sharp feature in the broader spectrum of propane, and harmonic signals are obtained by lock-in amplifier for gas concentration deduction. The surrounding gas is extracted into the fine optical absorption cell through the pump to realize online detection. The absorption cell is designed in mid infrared windows range. An example experimental setup is shown. The second harmonic signals 2f and first harmonic signals1f are obtained. We present the sensor performance test data including dynamic precision and temperature stability. The propane detection sensor system and device is portable can carried on the mobile inspection vehicle platforms or intelligent robot inspection platform to realize the leakage monitoring of whole oil gas tank area.

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