Dr. Jun Huang Profile

Dr. Jun Huang

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Proceedings Article | 13 December 2024 Paper

Measurement and inversion of water vapor in Dalian by high resolution non-modulated laser heterodyne radiometer

Yuan Meng, Yinbo Huang, Zhensong Cao, Xingji Lu, Huanhuan Shou, Jun Huang

Proceedings Volume 13504, 135040C (2024) https://doi.org/10.1117/12.3047913

KEYWORDS: Heterodyning, Signal detection, Quantum cascade lasers, Signal to noise ratio, Oscillators, Modulation, Spectral resolution, Equipment, Absorption spectrum, Sensors

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This paper reports on a non-modulated all-fiber LHR setup that utilizes a 1.316 μm narrow-linewidth DFB laser as the local oscillator. This device abandons the traditional method of using a chopper and a lock-in amplifier for modulation and demodulation. Instead, it employs multiple averaging techniques, reducing the complexity of the signal processing module in the LHR. This approach avoids the impact of low-pass filtering during demodulation on the instrument line shape function and measurement speed of the LHR, thereby enhancing spectral resolution and effectively improving the system's measurement speed. In May and June 2024, field measurements were conducted in the Changxing Island area of Dalian. The LHR signals of water vapor molecules in the 7597-7598 cm⁻¹ range were obtained with a spectral resolution of 0.003 cm⁻¹. The processed signals were then wavelength-calibrated and normalized, resulting in the relative transmittance spectrum of the entire atmospheric column for water vapor molecules. An optimal estimation method was used to establish a LHR retrieval algorithm. The retrieval ultimately yielded vertical profiles and column concentrations of water vapor molecules throughout the entire atmosphere. The research findings indicate that the non-modulated all-fiber approach can simplify the structure of the LHR, improve device performance, and has significant implications for the optimization and integration of LHR.

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