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Method and device for detecting shape of underwater objects based on frequency domain

An object and frequency domain technology, applied in the field of underwater detection, can solve the problems of incomplete detection of objects, detection limitations, etc., to achieve rapid detection, wide application range, and good flexibility.

Active Publication Date: 2021-06-01
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In some environments, the detection based on the active electric field may be limited. For example, the target object is partially buried by other substances that can isolate the detection, or the object is very large, and only care about the specific direction and shape of the object. At this time, the object cannot be detected. All-round complete detection, only part of the object can be scanned at a limited angle, therefore, there is a need for an underwater shape detection method that can still recognize the shape of the object even under the above conditions

Method used

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  • Method and device for detecting shape of underwater objects based on frequency domain
  • Method and device for detecting shape of underwater objects based on frequency domain
  • Method and device for detecting shape of underwater objects based on frequency domain

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1: Single-direction multi-channel detection of an aluminum cube.

[0046] Such as image 3 As shown, use the motion control device to drive the electrode to detect the object. From the starting point, the electrode sweeps over the object. After each scan, the X-axis moves laterally until the end of the movement. In this detection, the lateral movement step is 7mm, and in five positions Probing. Similarly, use the combination of multi-frequency signal and single-frequency signal to find the turning frequency, the conductivity of the water body is 17.5mS / m, and the temperature is 10 degrees Celsius.

[0047] Such as Figure 4 As shown in Table 1, (a) is the time-frequency distribution diagram under multi-frequency; (b)~(f) the time-frequency distribution curves under 10Hz, 20Hz, 30Hz, 40Hz, and 50Hz respectively list the 20HZ pulse signal response The time-frequency distribution spectrogram below and the time-frequency distribution curves at frequencies of 1...

Embodiment 2

[0055] Embodiment 2: Single-direction multi-channel detection of aluminum hexagonal prism.

[0056] Rotate the hexagonal prism at a certain angle, such as Figure 8 As shown, there are two turning points in this direction, and there are three turning frequencies, such as Figure 9 , 10 , 11 shown.

[0057] Figure 9 (a)(b) is the time-frequency distribution diagram under multi-frequency; (c)~(i) is the time-frequency curve under 20Hz, 50Hz, 100Hz, 150Hz, 200Hz, 250Hz, 300Hz;

[0058] Figure 10 (a)(b) is the time-frequency distribution diagram under multi-frequency; (c)~(i) is the time-frequency curve under 100Hz, 150Hz, 180Hz, 200Hz, 210Hz, 230Hz, 250Hz, 300Hz;

[0059] Figure 11 (a)(b) is the time-frequency distribution diagram under multi-frequency; (c)~(i) is the time-frequency curve under 150Hz, 180Hz, 190Hz, 200Hz, 230Hz, 250Hz, 270Hz, 350Hz.

[0060] exist Figure 9 In (a) and (b), because the value of the corner frequency is large, two combined spectrum diagra...

Embodiment 3

[0064] Example 3: Single-direction multi-channel detection of aluminum cylinders.

[0065] Use an aluminum cylinder for detection, and perform 5 detections in the same way, such as Figure 13 As shown, they are marked 1, 2, 3, 4, 5 in order from left to right, and the experimental data are all different.

[0066] data such as Figure 14-18 And as shown in Table 4:

[0067] Figure 14 (a) is the time-frequency distribution under multi-frequency; (b)~(f) are the time-frequency curves under 10Hz, 20Hz, 30Hz, 40Hz, 50Hz;

[0068] Figure 15 (a) is the time-frequency distribution under multi-frequency; (b)~(f) are the time-frequency curves under 10Hz, 20Hz, 30Hz, 40Hz, 50Hz;

[0069] Figure 16 (a) is the time-frequency distribution at multiple frequencies; (b)~(d) are the time-frequency curves at 10Hz, 20Hz, and 30Hz;

[0070] Figure 17 (a) is the time-frequency distribution at multiple frequencies; (b)~(d) are the time-frequency curves at 5Hz, 10Hz, and 20Hz;

[0071] ...

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Abstract

The invention discloses a method and device for detecting the shape of an underwater object based on the frequency domain, comprising the following steps: establishing a detection electric field, collecting electric field signals, calculating the corner frequency of the position, moving a transmitting electrode to obtain a plurality of position corner frequencies and acquiring The shape of the target orientation. The invention detects the object multiple times from different positions in the same direction through the underwater active electric field, processes the collected electric field information to obtain the turning frequency at different positions in the same direction of the object, and then processes and judges the shape of the object in a single direction . This method can overcome the influence of many complex factors such as dark and turbid underwater environment, and has simple operation, rapid detection, good flexibility, wide application range, low requirements on hardware equipment, and is suitable for liquid environments with conductive characteristics. In particular, it has a good effect when only part of the object can be detected or only the shape in a specific direction is concerned.

Description

technical field [0001] The invention relates to the field of underwater detection, in particular to a method for detecting the shape of an underwater object based on the frequency domain. Background technique [0002] Underwater detection is a technology still in development. The underwater environment is ever-changing, and different detection technologies are often used for different targets. Commonly used underwater detection methods include sonar detection and blue-green laser underwater detection, which can be used to locate objects, measure the speed of objects, find mineral resources, etc., but there are still relatively few detection methods specifically for the shape of underwater objects. The shape detection of underwater objects has a very wide range of applications, such as determining sunken ships and accurate surveying of underwater environments. [0003] The active electric field detection technology comes from the bionic of weak electric fish. Weak electric...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/08G01B7/28
CPCG01B7/28G01V3/088
Inventor 彭杰钢苏新铎
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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