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Development of a deep-sea laser-induced breakdown spectrometer for in situ multi-element chemical analysis

Development of a deep-sea laser-induced breakdown spectrometer for in situ multi-element chemical analysis
Development of a deep-sea laser-induced breakdown spectrometer for in situ multi-element chemical analysis
Spectroscopy is emerging as a technique that can expand the envelope of modern oceanographic sensors. The selectivity of spectroscopic techniques enables a single instrument to measure multiple components of the marine environment and can form the basis for versatile tools to perform in situ geochemical analysis. We have developed a deep-sea laser-induced breakdown spectrometer (ChemiCam) and successfully deployed the instrument from a remotely operated vehicle (ROV) to perform in situ multi-element analysis of both seawater and mineral deposits at depths of over 1000 m. The instrument consists of a long-nanosecond duration pulse-laser, a spectrometer and a high-speed camera. Power supply, instrument control and signal telemetry are provided through a ROV tether. The instrument has two modes of operation. In the first mode, the laser is focused directly into seawater and spectroscopic measurements of seawater composition are performed. In the second mode, a fiber-optic cable assembly is used to make spectroscopic measurements of mineral deposits. In this mode the laser is fired through a 4 m long fiber-optic cable and is focused onto the target’s surface using an optical head and a linear stage that can be held by a ROV manipulator. In this paper, we describe the instrument and the methods developed to process its measurements. Exemplary measurements of both seawater and mineral deposits made during deployments of the device at an active hydrothermal vent field in the Okinawa trough are presented. Through integration with platforms such as underwater vehicles, drilling systems and subsea observatories, it is hoped that this technology can contribute to more efficient scientific surveys of the deep-sea environment.
0967-0637
20-36
Thornton, Blair
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Takahashi, Tomoko
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Sato, Takumi
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Sakka, Tetsuo
fd41ffee-1abd-46cb-99dc-94bb96aecc38
Tamura, Ayaka
3f8146ef-01c2-43b6-9f4c-3f4650c3c144
Matsumoto, Ayumu
189e9690-f8b7-449a-8ca6-ee3e88c99d64
Nozaki, Tatsuo
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Ohki, Toshihiko
e8962f22-9e79-46b8-8b97-8a99c3dc47d4
Ohki, Koichi
0591f5f7-dcf3-45b0-a6ee-9b026b7b82a6
Thornton, Blair
8293beb5-c083-47e3-b5f0-d9c3cee14be9
Takahashi, Tomoko
3f3f98c5-993c-4e11-b5ec-0fa4dbdbced9
Sato, Takumi
839ad99c-91f6-4f88-9d5d-d39022eb990b
Sakka, Tetsuo
fd41ffee-1abd-46cb-99dc-94bb96aecc38
Tamura, Ayaka
3f8146ef-01c2-43b6-9f4c-3f4650c3c144
Matsumoto, Ayumu
189e9690-f8b7-449a-8ca6-ee3e88c99d64
Nozaki, Tatsuo
72088ad3-6a8e-44b5-8192-968b3530a545
Ohki, Toshihiko
e8962f22-9e79-46b8-8b97-8a99c3dc47d4
Ohki, Koichi
0591f5f7-dcf3-45b0-a6ee-9b026b7b82a6

Thornton, Blair, Takahashi, Tomoko, Sato, Takumi, Sakka, Tetsuo, Tamura, Ayaka, Matsumoto, Ayumu, Nozaki, Tatsuo, Ohki, Toshihiko and Ohki, Koichi (2015) Development of a deep-sea laser-induced breakdown spectrometer for in situ multi-element chemical analysis. Deep Sea Research Part I: Oceanographic Research Papers, 95, 20-36. (doi:10.1016/j.dsr.2014.10.006).

Record type: Article

Abstract

Spectroscopy is emerging as a technique that can expand the envelope of modern oceanographic sensors. The selectivity of spectroscopic techniques enables a single instrument to measure multiple components of the marine environment and can form the basis for versatile tools to perform in situ geochemical analysis. We have developed a deep-sea laser-induced breakdown spectrometer (ChemiCam) and successfully deployed the instrument from a remotely operated vehicle (ROV) to perform in situ multi-element analysis of both seawater and mineral deposits at depths of over 1000 m. The instrument consists of a long-nanosecond duration pulse-laser, a spectrometer and a high-speed camera. Power supply, instrument control and signal telemetry are provided through a ROV tether. The instrument has two modes of operation. In the first mode, the laser is focused directly into seawater and spectroscopic measurements of seawater composition are performed. In the second mode, a fiber-optic cable assembly is used to make spectroscopic measurements of mineral deposits. In this mode the laser is fired through a 4 m long fiber-optic cable and is focused onto the target’s surface using an optical head and a linear stage that can be held by a ROV manipulator. In this paper, we describe the instrument and the methods developed to process its measurements. Exemplary measurements of both seawater and mineral deposits made during deployments of the device at an active hydrothermal vent field in the Okinawa trough are presented. Through integration with platforms such as underwater vehicles, drilling systems and subsea observatories, it is hoped that this technology can contribute to more efficient scientific surveys of the deep-sea environment.

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Accepted/In Press date: 18 October 2014
e-pub ahead of print date: 29 October 2014
Published date: January 2015
Organisations: Fluid Structure Interactions Group

Identifiers

Local EPrints ID: 400010
URI: http://eprints.soton.ac.uk/id/eprint/400010
ISSN: 0967-0637
PURE UUID: f784ea65-e043-407e-b5aa-cbcfa2518cd8

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Date deposited: 06 Sep 2016 15:51
Last modified: 26 Apr 2022 22:17

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Contributors

Author: Blair Thornton
Author: Tomoko Takahashi
Author: Takumi Sato
Author: Tetsuo Sakka
Author: Ayaka Tamura
Author: Ayumu Matsumoto
Author: Tatsuo Nozaki
Author: Toshihiko Ohki
Author: Koichi Ohki

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