Evaluation of near-infrared laser Raman spectroscopy underwater research

Jinjia Guo; Bin Zhang; Jianglai Wu; Ronger Zheng

doi:10.1117/12.836270

28 August 2009 Evaluation of near-infrared laser Raman spectroscopy underwater research

Jinjia Guo, Bin Zhang, Jianglai Wu, Ronger Zheng

Proceedings Volume 7382, International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging; 738219 (2009) https://doi.org/10.1117/12.836270
Event: International Symposium on Photoelectronic Detection and Imaging 2009, 2009, Beijing, China

Abstract

The in-situ chemical detection in deep sea is very important for mineral resources exploitation. Laser Raman Spectroscopy as a powerful tool for chemical analysis has been used in deep sea detection recently. It was found that the fluorescence always exists as the background on Raman spectra detecting in ocean. It is apparent that the fluorescence background could be decrease effectively using near infrared wavelength as excitation source. While near infrared laser has few application underwater due to the absorption of water in this wavelength range. In this paper, a 785nm Raman spectrometer was used to evaluate the near infrared laser Raman spectroscopy for underwater application. It was found that the Raman shift of SO₄ ^2- at 981cm^-1 can be easily detected from Qingdao near shore sea water samples without sever fluorescence background. With mixed solution of SO₄ ^2- and HCO₃ -, the detection limit achieved for SO₄ ^2- at 981cm^-1 and HCO₃ - at 1017cm^-1 was obtained by 785nm compact Raman spectrometer to be 0.00625mol/l and 0.025mol/l with 10s integration time respectively. The obtained results proved the feasibility of near infrared laser Raman underwater detection.

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Jinjia Guo, Bin Zhang, Jianglai Wu, and Ronger Zheng "Evaluation of near-infrared laser Raman spectroscopy underwater research", Proc. SPIE 7382, International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging, 738219 (28 August 2009); https://doi.org/10.1117/12.836270

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KEYWORDS

Raman spectroscopy

Spectroscopy

Laser spectroscopy

Near infrared

Luminescence

Infrared spectroscopy

Ocean optics

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