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
CN1373362AInactive Publication Date: 2002-10-09SOUTH CHINA NORMAL UNIVERSITY
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Patent Information

Authority / Receiving Office
CN Ā· China
Patent Type
Applications(China)
Current Assignee / Owner
SOUTH CHINA NORMAL UNIVERSITY
Publication Date
2002-10-09
Estimated Expiration
Not applicable Ā· inactive patent

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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.
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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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