本文選題：激光超聲 + 楊氏模量��； 參考：《實驗力學(xué)》2016年03期

【摘要】：由于采用干涉儀的激光超聲技術(shù)造價較高,對環(huán)境噪聲極為敏感,很難在工業(yè)中得到廣泛應(yīng)用,為此開發(fā)了基于壓電傳感器的激光超聲場檢測儀(LUFT)。該系統(tǒng)采用激光激發(fā)、壓電傳感接收的方式,既保留了激光高分辨率的優(yōu)勢,又兼具了系統(tǒng)造價低、使用方便的特點(diǎn)。本文中,利用該檢測儀對標(biāo)準(zhǔn)鋼試樣及不同厚度的鋁試樣進(jìn)行了測量,獲得其表面波和縱波波速,并根據(jù)固體力學(xué)理論得到鋁的泊松比和楊氏模量。計算結(jié)果與文獻(xiàn)參考值誤差較小,說明該方法的可行性,也說明了該激光超聲場檢測儀的可靠性。
[Abstract]:Because of the high cost of laser ultrasonic technology using interferometer and its sensitivity to environmental noise, it is difficult to be widely used in industry. Therefore, a laser ultrasonic field detector (LUFT) based on piezoelectric sensor is developed. The system adopts laser excitation and piezoelectric sensor receiving, which not only retains the advantage of high resolution of laser, but also has the characteristics of low cost and convenient use. In this paper, the surface and longitudinal wave velocities of standard steel and aluminum samples with different thickness are measured by using this instrument, and the Poisson's ratio and Young's modulus of aluminum are obtained according to the theory of solid mechanics. The error between the calculated results and the reference values is small, which indicates the feasibility of the method and the reliability of the laser ultrasonic field detector.
【作者單位】： 同濟(jì)大學(xué)航空航天與力學(xué)學(xué)院;
【分類號】：TH878.2

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本文編號：2073582