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Method and apparatus for measuring photoacoustic signal in biological tissue by ultrasonic beams

A biological tissue, acoustic signal technology, applied in the field of measurement, can solve the problems of poor signal-to-noise ratio, undetectable signal, weak photoacoustic signal, etc., to achieve the effects of easy assembly, improved signal-to-noise ratio, and convenient operation

Inactive Publication Date: 2002-10-09
SOUTH CHINA NORMAL UNIVERSITY
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Problems solved by technology

This results in a very weak photoacoustic signal and requires a highly sensitive detector
Due to the limited response threshold of the detector, it is likely that no signal can be detected, or the signal-to-noise ratio is poor

Method used

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  • Method and apparatus for measuring photoacoustic signal in biological tissue by ultrasonic beams
  • Method and apparatus for measuring photoacoustic signal in biological tissue by ultrasonic beams
  • Method and apparatus for measuring photoacoustic signal in biological tissue by ultrasonic beams

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Embodiment Construction

[0028] like figure 1 As shown, the device of the present invention is mainly composed of a laser 1, an ultrasonic generation component 2, an acoustic signal measurement component 3, a signal amplifier 4, a data acquisition card 5, a real-time Fourier transform module 6, and a computer 7; wherein the ultrasonic generation component 2 is composed of a function generator. 2-1. The power amplifier 2-2, the ultrasonic transducer 2-3 and the ultrasonic lens 2-4 are connected in sequence; the ultrasonic lens 2-4 is fixed with the ultrasonic transducer 2-3 by a screw cover, and other connections are made in sequence The ultrasonic generating component 2 is acoustically connected with the acoustic signal measuring component 3; the acoustic signal measuring component 3, the preamp 4, the signal amplifier 5, the data acquisition card 6, and the computer 7 are electrically connected in sequence. Other components are: sample 8 , light transmission window 9 , ultrasonic beam 10 , sample cel...

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Abstract

A method for measuring photoacoustic signals in biological tissue includes emitting laser pulses into biological tissue to generate photoacoustic field, emitting a focused ultrasonic beam into the photoacoustic field to superpose on photocoustic signal and generate its beat signals, receiving and measuring them, separating signal spectrum, and extracting photoacoustic signals. Its apparatus is composed of laser device, ultrasonic generator, sound signal measurer, signal amplifier, data acquisition card, and computer. It can diagnose the lesion of biological tissue with radiactive damage.

Description

technical field [0001] The present invention relates to measurement technology, and more particularly to a method for measuring photoacoustic signals of biological tissue with a probe ultrasonic beam. [0002] The invention also relates to a device for use in the method for measuring photoacoustic signals of biological tissue with a probe ultrasonic beam. Background technique [0003] In recent years, more and more attention has been paid to the research and application of photoacoustic effect. When an object is irradiated with light, its internal temperature will change due to its absorption of light, thereby causing changes in the mechanical parameters of its local area; when a pulsed light source or a modulated light source is used, the fluctuation of local temperature in the object will cause Its volume expands and contracts, so it can radiate sound waves outward. This phenomenon is called the photoacoustic field effect (referred to as the photoacoustic effect). The p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B8/00G01N29/00G01N29/04
Inventor 邢达姚勇
Owner SOUTH CHINA NORMAL UNIVERSITY
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