| 摘 要： | By using a strong light-absorbing surface layer and front-surfaceillumination with a low power He-Ne laser(6mW),photoacousticmeasurements of the thermal effusivities of materials have been made,based on the photoacoustic theory,derived in this paper,of condensedmatter with a strong light-absorbing surface layer.This method can elimi-nate the stray light,give full play to the power of the light irradiation,and improve the signal to noise ratio.The experiment results are in goodagreement with the theoretical values.
|
