RamaCam: autonomous in-situ monitoring system of marine particles by combining holography and Raman spectroscopy

Takahashi, Tomoko; Liu, Zonghua; Thevar, Thangavel; Burns, Nicholas; Sangekar, Mehul; Lindsay, Dhugal; Watson, John; Thornton, Blair. 2023 RamaCam: autonomous in-situ monitoring system of marine particles by combining holography and Raman spectroscopy. In: International Symposium on Underwater Technology, Tokyo, Japan, 6-9 March 2023. IEEE Underwater Technology (UT), IEEE, 1-5.

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Abstract/Summary

Suspended particles in the ocean play an important role in global nutrient cycles. In this paper, a novel technique for the non-contact fast identification of marine particles is reported. An integrated method of digital holography and Raman spectroscopy aiming at in-situ continuous monitoring of marine particles, particularly in the deep sea where the density of particles is extremely low, is proposed. A particle located in a 20 cm water channel was illuminated using a collimated continuous wave laser beam which is used to take both a hologram and Raman spectrum to identify the shape, size and composition of the suspended material. Using a compact system, we have demonstrated the morphological and chemical analysis of plastic particles in a large volume of water. Furthermore, we have developed the in-situ device and tested it in the deep sea at a water depth of 900 m for the first time. The technique will contribute to the understanding of global-scale marine particle distributions.

Item Type:	Publication - Conference Item (Paper)
Digital Object Identifier (DOI):	10.1109/UT49729.2023.10103388
Date made live:	06 Jul 2023 08:13 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/535326

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