Foreign body detecting method using thermoacoustic imaging and device thereof

A technology for detecting foreign matter and thermoacoustic imaging, which is applied in applications, acoustic wave diagnosis, infrasonic wave diagnosis, etc., can solve the problems of expensive equipment, poor mobility, and complicated operation, and achieve rapid nondestructive testing, strong penetration ability, and high contrast. Effect

Inactive Publication Date: 2007-08-08
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the detection methods of foreign matter at home and abroad are to use X-ray direct fluoroscopy to image the foreign matter to be tested, or to use ultrasonic waves to image the foreign matter to be tested. The disadvantages of these methods and th

Method used

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  • Foreign body detecting method using thermoacoustic imaging and device thereof
  • Foreign body detecting method using thermoacoustic imaging and device thereof
  • Foreign body detecting method using thermoacoustic imaging and device thereof

Examples

Experimental program
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Embodiment 1

[0033] Embodiment 1 Device of the present invention

[0034] Fig. 1 is a structural diagram of a preferred device of the present invention, which is composed of a microwave generating component, a rotating scanning component, an acoustic signal collecting component, a computer, a sample fixing component, and an acoustic coupling component. The microwave generating component is composed of a microwave generator 1-1 connected to a waveguide port 1-2; the rotating scanning component is controlled by a computer 4 through a digital I / 0 card and a relay 2-3 to control the rotating sample stepper motor 2-1 and the three-dimensional scanning platform 2-2, the three-dimensional scanning platform 2-2 moves with the acoustic detector 3-1; the acoustic signal acquisition component is received by the acoustic detector 3-1, and then amplified by the signal amplifier 3-2 and collected by the high-speed acquisition card 3-3 Transmission to the computer 4, the controller 3-4 (programmable logi...

Embodiment 2

[0036] Embodiment 2 Preferred method of the present invention

[0037] (1) Fix the object to be measured on the sample stage, and use pulsed microwaves with a wavelength of 1mm to 1m to impinge on the object to be measured to excite the object to be measured to generate a thermoacoustic signal;

[0038] (2) Under the control of the LabVIEW acquisition program, the stepper motor drives the multi-element linear array detector or the object to be measured to rotate to collect the thermoacoustic signal, and simultaneously collect the thermoacoustic signal data;

[0039] (3) Using MATLAB software to preprocess the collected signal and reconstruct the back-projected image through the computer, and then obtain the image of the object to be measured through the back-projection algorithm.

Embodiment 3

[0040] Embodiment 3 Application of the method and device of the present invention to detect the K-shaped black rubber foreign matter in the agar

[0041] Utilize the apparatus of embodiment 1 to detect rubber foreign matter in agar according to the steps of embodiment 2. Among them, the wavelength of the microwave generator output pulsed microwave is 25cm, the pulse width and repetition frequency are selected as 0.5us and 5.086Hz respectively, the angle of sample rotation is 180°, the rotation step length of the stepping motor is 36°, and there are 5 signal acquisition positions . Obtain the image as shown in Figure 3, as can be seen from the image, it can well correspond with the sample photo (Fig. 2) on characteristics such as relative position, shape, size, illustrate that the method and device of the present invention form the test object. The image is consistent with the position, shape, and size of the object to be measured, and can accurately detect foreign objects.

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PUM

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Abstract

The invention relates to a method for using thermal sound image to detect foreign material and relative device. Said device is formed by a microwave generator, a rotational scanning element, a sound signal collector, a computer, a sample fixer, and a sound coupler, while the microwave generator, sound signal collector, and the computer are electrically connected; the rotationally scanning element is electrically connected with the computer; the sample fixer is in the sound coupler; and the sample fixer is connected with the rotational scanning element. The invention has high positioning accuracy, high resolution and the application for supplying clear image to the foreign material detecting technique, with low cost.

Description

technical field [0001] The invention relates to the technical field of testing, measurement and imaging, in particular to a method and device for detecting foreign matter by using thermoacoustic imaging. Background technique [0002] At present, the detection methods of foreign matter at home and abroad are to use X-ray direct fluoroscopy to image the foreign matter to be tested, or to use ultrasonic waves to image the foreign matter to be tested. The disadvantages of these methods and the devices for realizing these methods are poor mobility, complicated operation, time-consuming and labor-intensive, Moreover, film work is required, and the resolution is relatively poor; in addition, the device price for realizing these methods is also relatively expensive. Contents of the invention [0003] In order to solve the above problems in the prior art, the present invention provides a method for detecting foreign objects using thermoacoustic imaging, which includes the following...

Claims

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Application Information

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IPC IPC(8): A61B5/06A61B10/00A61B8/00
Inventor 邢达曾吕明
Owner SOUTH CHINA NORMAL UNIVERSITY
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