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

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

doi:10.1117/12.3018634

30 April 2024 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, Sixth Conference on Frontiers in Optical Imaging and Technology: Novel Technologies in Optical Systems; 1315316 (2024) https://doi.org/10.1117/12.3018634
Event: Sixth Conference on Frontiers in Optical Imaging Technology and Applications (FOI2023), 2023, Nanjing, JS, China

Abstract

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.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Gang Qi, Zhensong Cao, Yuan Meng, Yinbo Huang, and Xingji Lu "Atomic absorption spectroscopy detection system based on wavelength modulation and wavelet denoising", Proc. SPIE 13153, Sixth Conference on Frontiers in Optical Imaging and Technology: Novel Technologies in Optical Systems, 1315316 (30 April 2024); https://doi.org/10.1117/12.3018634

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