Abstract
The dimensionality of the photopyroelectric signal and the importance of radiation heat transfer mechanisms in a thermal-wave cavity (TWC) are closely investigated in the current study. Radiation components were added to the purely conduction model by linearizing the radiation heat transfer at the brass film-air boundary. A 3-D theoretical approach based on the Hankel integral was developed and implemented. Experimental results indicate that a 3-D model is necessary to describe the PPE signal, especially at low frequencies. Radiation is found to be the major contributor of the photopyroelectric (PPE) signal when high frequencies and large cavity lengths are used.
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