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Research on Simulating Cobalt-Rich Crust in the Ocean by High Frequency Acoustic Waves
Author(s): 
Pages: 23-27
Year: Issue:  1
Journal: Ocean Technology

Keyword:  manned submersiblecobalt-rich crustsin-situ detectionhigh-frequency sound wavesecho strength;
Abstract: Aiming at the problem of in-situ detection of cobalt-rich crusts by using ultrasonic wave in the deep sea exploration of the "Jiaolong" manned submersible. In this paper, cobalt-rich crusts and various types of bedrock in different areas are simulated in the laboratory, and high-frequency ultrasonic signals transmitted by a2.25 MHz ultrasonic probe are used to measure cobalt-rich crusts collected using geological trawls. Firstly,researchers carried out measurement of the sound velocity and the echo intensity of cobalt-rich crusts from different sea mounts. Then, cobalt-rich crust samples with bedrock were tested to obtain the reflection wave form and the echo intensities of all types of bedrock, whose types are classified by the intensity of the echoes. The experimental results show that the echogenic intensities are different for altered basalts, carbonate sediments,calcareous oceanic sediments and mud blocks’ reflection wave form and the echo intensities. High-frequency acoustic waves can effectively distinguish the types of bedrock under the cobalt-rich crust. It’s possible for manned submersibles to finish the aim of in-situ thickness detection.
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