Abstract
Laser-generated surface acoustic wave (SAW) is widely used in damage detection, elastic constant evaluation, film thickness determination and so on. Among them, the amplitude attenuation and frequency components of SAW are important index parameters in data analysis. In this paper, the diffuse attenuations of SAW generated by laser line source in non-contact and contact detection methods are analyzed respectively, and the calculation formulas are given. Contact SAW detector is widely used because of its high sensitivity and high stability, but it will produce frequency error. In this paper, the relationship between the detection line length of the contact detector and the signal amplitude, signal noise ratio (SNR) and frequency error is analyzed. It is found that for a certain detection line length, the higher the SAW center frequency, the greater the frequency error.
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