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本文在导出了具有强吸光表面层的凝聚态介质光声信号表达式的基础上,利用强吸光表面层、小功率He-Ne激光(6mW)前表面辐照,测量了一些物质的热流率(Thermal Effusivity)。该方法有效地消除了散射光,充分利用光源功率,提高了光声信号信噪比。实验结果很好地与文献值相吻合。
In this paper, based on the derivation of the photoacoustic signal expression of the condensing medium with a strong light-absorbing surface layer, the heat flux of some materials is measured by using the strongly absorbing surface layer and the low-power He-Ne laser (6mW) front surface irradiation Thermal Effusivity. The method effectively eliminates the scattered light, makes full use of the light source power, and improves the signal-noise ratio of the photoacoustic signal. The experimental results are in good agreement with the literature values.