Current surveying method by means of acoustic Doppler current meter

A Doppler current and current meter technology, applied in fluid velocity measurement, full-field flow measurement, measurement device, etc., can solve problems such as inflexible working methods

Inactive Publication Date: 2016-08-10
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing current methods using acoustic Doppler current meters generally only have one working mode: direct reading or self-contained, and the working mode is not flexible enough

Method used

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  • Current surveying method by means of acoustic Doppler current meter
  • Current surveying method by means of acoustic Doppler current meter
  • Current surveying method by means of acoustic Doppler current meter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] An acoustic Doppler current meter, which includes a transducer 1, a system control module 8, a measurement processing module, a pressure sensor 12, an attitude sensor 8, a temperature sensor 15, a power conversion module 6, an alkaline battery pack 9 and a housing The casing includes an upper end cover 2, a cylinder body 3, a lower end cover 11, and a circuit board support 13. The upper end cover and the cylinder body, and the lower end cover and the cylinder body are both axially sealed and longitudinally sealed. At the same time, Two sealing methods are adopted, which have better sealing performance; the upper end cover 2, the cylinder body 3 and the lower end cover 11 are all made of 316 stainless steel, and the circuit board bracket 13 is made of metal aluminum material, which can reduce the weight of the current meter; A metal shielding plate 5 is provided.

[0031] There are 4 transducers embedded in the upper end cover, a sound window 14 for transducers on the su...

Embodiment 2

[0037] A method for measuring current by using an acoustic Doppler current meter, using the principle of acoustic Doppler frequency shift to measure the current flow rate, and specifically, by measuring the change in the interval between the emission band pulse signal and the echo pulse to obtain the relative relationship between the seawater medium and the current meter. Movement speed. The current measurement data is the relative movement speed of the seawater medium and the current meter. The specific measurement method is as follows: τ is the time interval change between the emission and echo pulses. The layout of the attitude sensor needs to be arranged in combination with the current meter coordinate system. The attitude sensor is northwest. The celestial coordinate system, its north direction coincides with the X-axis of the current meter, the number of the transducers is 4, and the 4 transducers emit a pair of broadband pulse signals in four directions, the time of the ...

Embodiment 3

[0048] Current meter workflow:

[0049] After the system is powered on, it first performs a self-check of the equipment. The collected pressure, attitude, and temperature data are updated at a frequency of 4Hz. After 1 minute, the self-check result is output. If it fails, wait for the operation. Valid data is output after minutes. After completing a measurement cycle, enter the low-power sleep state, wait for the arrival of the next measurement point, and repeat the above process.

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Abstract

The invention relates to the technical field of oceanographic observation and especially relates to a current surveying method by means of an acoustic Doppler current meter. The method comprises following steps: the current meter calculates the beam bottom depth and the beam bottom speed according to four beam echo signals obtained by a transducer in combination with the current meter set parameter information, gestures, temperature, pressure information and sound velocity information; generates a three-dimensional vector speed and then performs coordinate transformation; smoothes and filters current surveying data and finally outputs current surveying results. According to the method, acoustic Doppler frequency shift principles are adopted for measuring current velocity; ocean dynamic environment parameters and current data can be observed for a long time by deploying acoustic Doppler current meters in submerged buoy systems to obtain ocean dynamic environment parameters such as temperature, pressure, current velocity and flow direction in the deploying sea areas; the acoustic Doppler current meter has a direct reading work mode and a self-contained work mode, and has high current surveying accuracy and flexible operation.

Description

technical field [0001] The invention relates to the technical field of ocean observation, in particular to a method for measuring current by using acoustic Doppler current. Background technique [0002] Ocean current is an important parameter data for the study of the marine dynamic environment, and plays an important role in the development of marine resources, environmental information security, and scientific research. The existing instruments based on acoustic current measurement are divided into acoustic current meter and Doppler profiler. According to different measurement principles, the acoustic current meter is divided into a time difference type acoustic current meter, a focusing type acoustic current meter, and a Doppler type acoustic current meter. The advantages of high measurement accuracy and ability to measure low-speed ocean currents. The current meter can only make long-term continuous observation of the ocean current at a certain point in the ocean. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P5/24G01P5/00
CPCG01P5/244G01P5/001
Inventor 周丽芹葛安亮宋大雷王向东
Owner OCEAN UNIV OF CHINA
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