Boundary Condition Effect On Photoacoustic Response Of Absorbing Liquid To Modulation Of Laser Intensity

ALT Proceedings Pub Date : 2012-11-01 DOI:10.12684/ALT.1.91

A. Samokhin, N. N. Il'ichev, A. Ivochkin, E. Gulyamova

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引用次数: 3

Abstract

The photoacoustic (PA) pressure response of the absorbing liquid (water, ethanol) with free and confined surface to laser pulse with modulated intensity is studied. Modulation amplitude of the PA signal demonstrates non-monotonous behavior during laser pulse action which can be explained as interference between thermo-acoustic and vaporization mechanisms of pressure generation. The phase behavior of modulated part of PA signal also gives important information on processes in the irradiated matter. Doppler photoacoustic monitoring (DPM) is used to determine surface movement during laser irradiation (wavelength – 2.94 um, pulse duration ~ 200-300 ns, fluence ~ 0.3-1.6 J/cm2). In the case of free surface this movement is possible into the upward and downward directions while for the constrained irradiated surface only one movement is supposed. This supposition is in agreement with the experiment. However the total behavior of PA response is more complicated due to probably vapor cavity formation between liquid and solid surfaces. In particular, despite the imposed constraint PA response behavior resembles the free surface case.

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边界条件对吸收液光声响应对激光强度调制的影响

研究了具有自由和约束表面的吸收液(水、乙醇)对调制强度激光脉冲的光声压力响应。在激光脉冲作用下，声压信号的调制幅值表现出非单调的行为，这可以解释为压力产生的热声机制和汽化机制之间的干扰。扩频信号调制部分的相位行为也提供了辐照物质过程的重要信息。多普勒光声监测(DPM)用于测定激光照射(波长- 2.94 um，脉冲持续时间~ 200-300 ns，影响~ 0.3-1.6 J/cm2)过程中的表面运动。在自由表面上，这种运动可以向上和向下进行，而在受约束的辐照表面上，这种运动只能进行一次。这个假设与实验是一致的。然而，由于液体和固体表面之间可能形成气腔，因此PA响应的总体行为更为复杂。特别是，尽管施加了约束，但PA的响应行为类似于自由表面情况。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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ALT Proceedings

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