A laser ultrasonic photoacoustic conversion device and its preparation method

Abstract

The invention relates to a laser ultrasonic opto-acoustic conversion device. The device comprises a sound focusing crystal structure 1 used for laser ultrasonic focusing, wherein one side of the sound focusing crystal structure 1 is spin-coated with a composite opto-acoustic conversion layer 2, the composite opto-acoustic conversion layer 2 is used for laser ultrasonic enhancement and laser ultrasonic focusing; the composite opto-acoustic conversion layer 2 absorbs laser beams emitted by a laser, firstly converts the laser beams into acoustic energy, then focuses the acoustic energy and transmits generated ultrasonic signals to the sound focusing crystal structure 1, and the sound focusing crystal structure 1 is used for further focusing. Meanwhile, the invention further provides a manufacturing method of the device. The laser ultrasonic opto-acoustic conversion device serving as a new sound source has the advantages of high frequency of laser ultrasonic and high directivity of focusing ultrasonic, can realize nondestructive flaw detection of devices and has the advantages of non-contact, high flaw detection distinguishability and the like, the detection efficiency is improved, the detection time is saved, and the flaw detection depth is greatly improved while compared with that of conventional laser ultrasonic detection.

Description

technical field [0001] The invention relates to the cross technical fields of optical engineering, materials and acoustics, in particular to a laser ultrasonic photoacoustic conversion device and a preparation method thereof. Background technique [0002] Laser ultrasonic technology can be used for high-precision defect detection, among which laser ultrasonic nondestructive testing is one of the most studied aspects. The laser generates ultrasound through the thermoelastic effect on the surface of the sample, and the sound wave generated by the excitation is detected when it interacts with the defect when it propagates in the sample, and the position information of the defect is determined by signal processing the received acoustic signal. Due to the concentration of energy, focused ultrasound can achieve better directivity in non-destructive testing, and at the same time can achieve a higher detection depth. [0003] High Intensity Focused Ultrasound (HIFU) refers to a tre...

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Problems solved by technology

[0003] High Intensity Focused Ultrasound (HIFU) refers to a treatment technique that can focus ultrasonic waves on target tissues, causing them to generate heat and ablate them without affecting surrounding healthy tissues. This technology is promising for the treatment of cancer. The tissue area of ​​the tissue instantly generates a very high temperature to kill cancer cells without damaging the surrounding cells. This method has the characteristics of non-contact and non-invasive, so it has been widely studied, and most of the high-intensity focused ultrasound studied now is through pressure. Realized by the electric transducer array, the piezoelectric transducer is not only complex in structure, but also expensive. It needs a coupling agent matching layer between the acoustic focusing lens, which will pollute the object to be detected.

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