Water temperature sound chromatography method and device suitable for area where river flows into sea,
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An acoustic tomography, area technology, applied in measurement devices, thermometers that give differences, thermometers with physical/chemical changes, etc., can solve the problems of large sound propagation time measurement errors, difficult implementation, and low spatial resolution. , to achieve the effect of small environmental impact, small error, and breakthrough of technical bottlenecks
Active Publication Date: 2020-11-24
MINNAN NORMAL UNIV +1
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Problems solved by technology
These measurement methods can only monitor a small range of water temperature and cannot reflect the average temperature of a large area of water
In addition, in sea areas with complex environments, navigation monitoring is affected by fisheries and shipping
Especially in extreme weather such as heavy rainfall, flood peaks, and typhoons, it is difficult to implement the above method
[0003] The existing acoustic tomography uses sound waves to penetrate the entire water body to obtain the average water temperature in the area. However, the existing medium and low frequency acoustic tomography techniques can be applied to medium and large scales ranging from tens to thousands of kilometers. In areas where small-scale rivers flow into the sea, there are shortcomings such as large sound propagation time measurement errors and low spatial resolution, and it is difficult to obtain fine spatial distribution of water temperature, which cannot meet the needs of high time and spatial resolution monitoring of rivers entering the sea
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Embodiment 1
[0041] S1. the first ultrasonic extension is fixedly arranged in the area to be detected, the second ultrasonic extension that moves with the described carrier is set on the carrier, and the first ultrasonic extension and the second ultrasonic extension can all receive or transmit ultrasonic signals;
[0042] S2. The carrier moves the first path distance with the boundary of the area to be detected as a trajectory, and at the same time, the first ultrasonic extension starts to transmit the ultrasonic signal x(n), and the second ultrasonic extension starts to receive the ultrasonic signal y. (n), after the first time, the first time is 3-8s, at the same time, the second ultrasonic extension starts to transmit the ultrasonic signal x(n), and the first ultrasonic extension starts to receive the ultrasonic signal y(n). );
[0043] In this embodiment, the first time is 5s, and in other embodiments, the first time may also be 3s or 8s;
[0044] In this embodiment, the first ultraso...
Embodiment 2
[0067] A device for implementing the method of claim 1, comprising:
[0068] The first ultrasonic extension is fixedly arranged in the area to be detected;
[0069] The carrier is used to move at the boundary of the area to be detected;
[0070] The second ultrasonic extension is arranged on the carrier and moves with the carrier;
[0071] a control module, for controlling the movement of the carrier, and controlling the first ultrasonic extension and the second ultrasonic extension to transmit or receive ultrasonic signals;
[0072] The calculation module is used for the calculation of each step.
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Abstract
The invention relates to a water temperature sound chromatography method suitable for an area where a river flows into the sea, and the method comprises the following steps: S1, fixedly arranging a first ultrasonic extension set in a to-be-detected area, arranging a second ultrasonic extension set moving along with a carrier on the carrier, and enabling the first ultrasonic extension set and the second ultrasonic extension set to receive or transmit an ultrasonic signal; S2, the carrier moves for a first path distance by taking the boundary of the to-be-detected area as a track, and acoustic reciprocity transmission is adopted; S3, calculating the transmission time T of the ultrasonic signal in water; S4, repeating the steps S2-S3 for multiple times until the carrier walks over the boundary; S5, calculating the average sound velocity variation delta cj of the ultrasonic waves from the first ultrasonic extension set to the second ultrasonic extension set and from the second ultrasonic extension set to the first ultrasonic extension set each time; and S6, inverting the spatial distribution x of the water temperature through the relationship between the average sound velocity variation and the temperature.
Description
technical field [0001] The invention relates to the field of water temperature monitoring, in particular to a water temperature acoustic tomography method and a device thereof, which are suitable for rivers flowing into the sea. Background technique [0002] The area where the river flows into the sea is the most concentrated area of human marine development activities, and the distribution of water temperature is complex. To grasp the evolution of the ecosystem in the area where the river flows into the sea, temperature monitoring is particularly critical. It is also a technical bottleneck in the field of offshore marine monitoring. Therefore, it is extremely important to develop on-line monitoring technology for the temperature of rivers entering the sea to keep up with the international research frontier and the major national needs. At present, the temperature monitoring of shallow sea and estuary waters mainly adopts fixed-point or voyage measurement, such as temper...
Claims
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