A device and method for measuring underwater sediment deposition characteristics based on distributed acoustic wave sensing technology

The technology of an acoustic wave sensing and measuring device is applied in the field of measuring devices for underwater sediment deposition characteristics based on distributed acoustic wave sensing technology, which can solve the problems of fiber grating damage and high measurement cost, and achieve high sensitivity, simple operation, The effect of interference from external electromagnetic fields

CN112904409BActive Publication Date: 2022-05-03NANJING UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2022-05-03

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Abstract

The invention discloses a device and method for measuring underwater sediment deposition characteristics based on distributed acoustic wave sensing technology. In the measuring device of the method, the sensing element is composed of a benchmark and a strain sensing optical fiber; the strain sensing optical fiber is fixed on the benchmark The optical fiber leads are connected to the strain sensing optical fiber; the pulse vibrator is fixed on the top of the sensing element; one end of the distributed acoustic wave sensing demodulator is connected to the computer through a signal transmission line, and the other end is connected to the sensing element through an optical fiber lead; Insert the sensing element vertically into a certain underwater position to be measured, and then use the signal transmitter to send a signal to the pulse vibrator on the shore. The pulse vibrator will generate pulse vibration immediately after receiving the signal, and analyze the strain and frequency characteristics of the sensing element when it vibrates , the position of the underwater sediment-moisture interface can be judged by the strain characteristics of the sensing element, and the type of the underwater sediment can be judged by the frequency characteristics of the sensing element.
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Description

technical field

[0001] The invention relates to the field of measurement of underwater sediment deposition characteristics, in particular to a device and method for measuring underwater sediment deposition characteristics based on distributed acoustic wave sensing technology Background technique

[0002] Underwater sediment mainly refers to the solid matter that enters the water body in various ways and finally deposits at the bottom of the water body under the action of gravity. In different locations, there are obvious differences in the types of underwater sediments and the location of the interface with the water body. The study of sedimentary characteristics of underwater sediments plays an important role in the study of river hydrology and environmental evolution. Due to the natural barrier of the water body, the type of underwater sediment and the location of the interface with the water body cannot be known through visual observation. There are several existing met...

Examples

Embodiment 1

[0046] A device for measuring underwater sediment deposition characteristics based on distributed acoustic wave sensing technology, including a sensing element 1, a distributed acoustic wave sensing demodulator 2, a computer 3, a signal transmitter 4, a pulse vibrator 5 and an optical fiber lead 6 One end of the distributed acoustic wave sensing demodulator 2 is connected with the computer 3 through the signal transmission line 7, and the other end is connected with the strain sensing optical fiber 1-2 in the sensing element 1 through the optical fiber lead wire 6; the sensing element 1 includes a benchmark 1 -1 and strain sensing optical fiber 1-2; the benchmark 1-1 is a slender rod with a circular cross section, a straight groove is engraved on the surface of the benchmark 1-1, and the direction of the groove is in line with the axial direction of the benchmark 1-1 Parallel, the cross section of the groove is triangular, the depth of the groove is 2-4mm, and the strain sensin...

Embodiment 2

[0067] A device for measuring underwater sediment deposition characteristics based on distributed acoustic wave sensing technology, including a sensing element 1, a distributed acoustic wave sensing demodulator 2, a computer 3, a signal transmitter 4, a pulse vibrator 5 and an optical fiber lead 6 One end of the distributed acoustic wave sensing demodulator 2 is connected to the computer 3 through the signal transmission line 7, and the other end is connected to the sensing element 1 through the optical fiber lead wire 6; the sensing element 1 includes a benchmark 1-1 and a strain sensing optical fiber 1- 2. The benchmark 1-1 is a slender rod with a circular cross section. As a preferred embodiment of the present invention, the benchmark is made of an aluminum alloy rod with a length of 1.5m and a radius of 2cm. The surface of the benchmark 1-1 is engraved There is a straight groove, the direction of the groove is parallel to the axis direction of the benchmark 1-1, the cross s...