發(fā)布時(shí)間：2018-04-22 15:45

  本文選題：激光超聲 + 點(diǎn)光源��； 參考：《應(yīng)用光學(xué)》2017年03期

【摘要】：通過已搭建好的激光超聲檢測實(shí)驗(yàn)平臺,在保持相同激光脈沖能量和相同探測位置的條件下,重點(diǎn)研究了點(diǎn)光源與線光源產(chǎn)生的超聲信號的特點(diǎn)和區(qū)別。研究了不同探測位置點(diǎn)光源與線光源激發(fā)出的超聲信號幅值以及產(chǎn)生的超聲信號波形。實(shí)驗(yàn)發(fā)現(xiàn):在同一探測位置下,將點(diǎn)光源換成線光源后,產(chǎn)生的超聲信號幅值由1.3V提高到1.7V,提高了0.4V;在探測位置逐漸增大的情況下,點(diǎn)光源激發(fā)出超聲信號幅值的衰減幅度為75.78%,而線光源激發(fā)出的超聲信號幅值的衰減幅度為34.92%。結(jié)果表明,在功率密度相同的情況下,線光源產(chǎn)生的超聲信號要比點(diǎn)光源產(chǎn)生的超聲信號幅值提高40.86%,產(chǎn)生較強(qiáng)的表面波,提高了信噪比。
[Abstract]:On the condition of keeping the same laser pulse energy and the same detecting position, the characteristics and differences of the ultrasonic signals produced by the point light source and the line light source are studied. The amplitude and waveform of ultrasonic signal excited by point light source and linear light source at different detection positions are studied. The experimental results show that the amplitude of ultrasonic signal is increased from 1.3 V to 1.7 V at the same detection position, and when the detection position is gradually increasing, the ultrasonic signal amplitude is increased from 1.3V to 1.7V, and when the detection position is gradually increasing, the ultrasonic signal amplitude is increased from 1.3V to 1.7V. The attenuation amplitude of the ultrasonic signal excited by the point light source is 75.78, while the attenuation amplitude of the ultrasonic signal excited by the linear light source is 34.92. The results show that under the same power density, the ultrasonic signal generated by the line light source is 40.86 higher than the ultrasonic signal generated by the point light source, resulting in a strong surface wave and a higher signal-to-noise ratio (SNR).
【作者單位】： 中北大學(xué)計(jì)算機(jī)與控制工程學(xué)院;中北大學(xué)電子測試技術(shù)重點(diǎn)實(shí)驗(yàn)室;
【基金】：教育部博士點(diǎn)基金聯(lián)合資助項(xiàng)目(2013142012007)
【分類號】：TN24
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本文編號：1787868