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The development of an acoustic probe to measure the thickness of ferro-manganese crusts

The development of an acoustic probe to measure the thickness of ferro-manganese crusts
The development of an acoustic probe to measure the thickness of ferro-manganese crusts

This paper describes the development of an acoustic probe designed to perform in-situ measurements of ferro-manganese crust thickness at depths of up to 3000m. It is planned that this device will operate at low altitudes off the seafloor, mounted onboard an underwater vehicle, and continuously map the crust thickness of regions extending over several kilometres. A prototype probe has been developed together with an algorithm that automatically detects the reflections from the top and bottom surfaces of a layer of crust and measures its thickness. The performance of the system is demonstrated through a series of laboratory experiments carried out using crust samples obtained during the NT09-02 Leg2 of the R/V Natsushima. First, the ability of the system to measure crust thickness at various ranges to the target is assessed. Next, the effects of pressure are investigated in an experiment where the thicknesses of several crust samples are measured at pressures between 0.1 and 30MPa. Finally, the sub-bottom profiles of a number of crust samples, with and without substrates attached are measured.

1-9
Thornton, Blair
8293beb5-c083-47e3-b5f0-d9c3cee14be9
Asada, Akira
76e2e5fe-718d-4cdc-a708-4bf1112d8b0a
Ura, Tamaki
689db479-1520-4f32-bb7a-ed34b26b921f
Ohira, Katsumi
b1363824-d49d-4f84-9bfc-d8213b65b751
Kirimura, Daigo
edf8fc88-a2c1-4256-91d5-ce3007ac499d
Thornton, Blair
8293beb5-c083-47e3-b5f0-d9c3cee14be9
Asada, Akira
76e2e5fe-718d-4cdc-a708-4bf1112d8b0a
Ura, Tamaki
689db479-1520-4f32-bb7a-ed34b26b921f
Ohira, Katsumi
b1363824-d49d-4f84-9bfc-d8213b65b751
Kirimura, Daigo
edf8fc88-a2c1-4256-91d5-ce3007ac499d

Thornton, Blair, Asada, Akira, Ura, Tamaki, Ohira, Katsumi and Kirimura, Daigo (2010) The development of an acoustic probe to measure the thickness of ferro-manganese crusts. In OCEANS'10 IEEE Sydney, OCEANSSYD 2010. pp. 1-9 . (doi:10.1109/OCEANSSYD.2010.5603885).

Record type: Conference or Workshop Item (Paper)

Abstract

This paper describes the development of an acoustic probe designed to perform in-situ measurements of ferro-manganese crust thickness at depths of up to 3000m. It is planned that this device will operate at low altitudes off the seafloor, mounted onboard an underwater vehicle, and continuously map the crust thickness of regions extending over several kilometres. A prototype probe has been developed together with an algorithm that automatically detects the reflections from the top and bottom surfaces of a layer of crust and measures its thickness. The performance of the system is demonstrated through a series of laboratory experiments carried out using crust samples obtained during the NT09-02 Leg2 of the R/V Natsushima. First, the ability of the system to measure crust thickness at various ranges to the target is assessed. Next, the effects of pressure are investigated in an experiment where the thicknesses of several crust samples are measured at pressures between 0.1 and 30MPa. Finally, the sub-bottom profiles of a number of crust samples, with and without substrates attached are measured.

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More information

e-pub ahead of print date: 24 May 2010
Published date: 14 October 2010
Venue - Dates: OCEANS'10 IEEE Sydney, OCEANSSYD 2010, Australia, 2010-05-23 - 2010-05-26

Identifiers

Local EPrints ID: 434069
URI: http://eprints.soton.ac.uk/id/eprint/434069
PURE UUID: a39dfdbe-2360-4b8f-b7db-d49201b6ee55

Catalogue record

Date deposited: 11 Sep 2019 16:30
Last modified: 07 Oct 2020 00:45

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