Dr. Xingji Lu Profile

Dr. Xingji Lu

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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.

Proceedings Article | 30 April 2024 Paper

Atomic absorption spectroscopy detection system based on wavelength modulation and wavelet denoising

Gang Qi, Zhensong Cao, Yuan Meng, Yinbo Huang, Xingji Lu

Proceedings Volume 13153, 1315316 (2024) https://doi.org/10.1117/12.3018634

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Metal isotope abundance detection is significant in earth science, environmental monitoring and industrial applications. A new technique for the detection of metal isotopes was developed by wavelength modulation spectroscopy technology in this work. The measurements were made for the rubidium transition at 795 nm using four kinds of rubidium compound samples (RbCl, Rb₂CO₃, Rb₂SO₄, and RbI). Based on the redox reaction, the solid rubidium compound was mixed with the reducing agent. The micro-channel array structure of the atomic generator can produce highly collimated atomic vapor. The ability of high-order harmonics (2nd, 4th, and 6th) to suppress system noise was compared, and the result showed that the fourth-harmonic signal not only enhanced signal-to-noise ratio but also ensured effective spectral resolution. Compared with direct absorption, the signal-to-noise ratio of the 4th harmonic was enhanced by approximately 3.3 times. In addition, wavelet denoising further suppressed the baseline standard deviation of the system by about a factor of 1.

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