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A method for measuring the thickness of cobalt-rich crusts based on multi-beam receiving technology

A technology of cobalt-rich crusts and measurement methods, which is applied in the field of geological exploration, can solve problems such as measurement errors, and achieve the effects of high efficiency, large measurement area, and high thickness measurement accuracy

Active Publication Date: 2022-07-29
NAT DEEP SEA CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the signal incident grazing angle is simply approximated as 90° (incident grazing angle: the angle between the signal incident direction and the horizontal direction), it will inevitably lead to certain measurement errors

Method used

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  • A method for measuring the thickness of cobalt-rich crusts based on multi-beam receiving technology
  • A method for measuring the thickness of cobalt-rich crusts based on multi-beam receiving technology
  • A method for measuring the thickness of cobalt-rich crusts based on multi-beam receiving technology

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Effect test

Embodiment 1

[0017] The method of the present invention uses the multi-beam receiving technology, and the transmitting line array and the receiving line array adopt a T-shaped arrangement, such as figure 1 As shown, the transmitting line array is parallel to the survey line direction (the heading of the submersible carrier on which the crust thickness measurement equipment is installed), and the receiving line array is perpendicular to the survey line direction. The data processing flow is as figure 2 As shown, firstly transmit the narrow-band high-frequency PCW signal (here, the number of narrow-band high-frequency signal transmissions is defined as odd-numbered frames), and using the receiving beamforming technology can obtain multiple receiving strips, and then obtain multiple receiving strips perpendicular to the direction of the survey line. The seafloor echo signal of the measurement point and the backscattered signal of the seawater and seabed interface are strong. The bottom detec...

Embodiment 2

[0020] In this embodiment, laboratory measurement and verification are carried out on the plate-mounted imitation crust sample, and the imitation sample has a thickness of 100 mm and an area of ​​500*500 mm. First, place the transmitting transducer at a height of 1100mm directly above the imitation sample. The transmitter beam is in a 90° state with the imitation sample. The pulse width of the transmitted signal is 0.1ms, the center frequency is 100kHz, and it is continuously transmitted for 100 times, and the echo signal is received. Then, the thickness of the imitation sample is calculated by this method, and the calculation results are statistically analyzed. The average value of the calculated thickness of the imitation sample is 98.8mm, and the variance is 1.4*10 -17. Adjust the angle of the imitation sample so that it is 80° with the beam emitted by the transducer, simulate the undulation and tilt of the seabed, transmit the same signal, and transmit 100 times continuou...

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Abstract

The invention relates to a method for measuring the thickness of cobalt-rich crusts based on multi-beam receiving technology, which belongs to the technical field of geological exploration. The array is parallel to the direction of the survey line, the receiving line array is perpendicular to the direction of the survey line, and the direction of the survey line is the heading of the submersible carrier installed by the crust thickness measurement equipment; the multi-beam measurement technology is used to preliminarily measure the The crust thickness value; then obtain the micro-topographic relief of the seabed according to the multi-beam receiving technology, estimate the incident angle of the signal in each beam, and further correct the crust thickness measured in each beam. Inertial Bayesian filtering method tracks crust thickness variation, thereby improving measurement accuracy.

Description

technical field [0001] The invention belongs to the technical field of geological exploration, and in particular relates to a method for measuring the thickness of a cobalt-rich crust based on a multi-beam receiving technology. Background technique [0002] Cobalt-rich crusts are rich in metals such as cobalt, nickel, platinum, and rare earths. The oxidized deposits of cobalt-rich crusts are found in the global ocean, and are concentrated on the slopes and tops of seamounts, ridges and platforms. There are about 50,000 seamounts in the Pacific Ocean, which are rich in cobalt-rich crusts. Despite the abundance of cobalt-rich crusts on the ocean floor, few seamounts have been carefully surveyed and sampled. At present, the rough assessment of cobalt-rich crust resources mainly uses acoustic equipment such as shallow stratigraphic profiler, multi-beam sounding sonar, and side-scan sonar to obtain seabed echo signals. crust. Sophisticated assessment methods are to use photogr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B15/02G01S15/02G01S7/539
CPCG01B15/02G01S15/02G01S7/539
Inventor 杨志国刘保华孙永福宗乐于凯本于盛齐史先鹏
Owner NAT DEEP SEA CENT
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