Thermal Effusivity Investigations of Solid Materials by Using the Thermal-Wave-Resonator-Cavity (TWRC) Configuration. Theory and Mathematical Simulations

摘要

An alternative photopyroelectric (PPE) technique that combines the front detection configuration (FPPE) with the thermal-wave-resonator-cavity (TWRC) method is proposed. The theoretical analysis of the phase of the FPPE signal indicates that the configuration offers information about both fluid sample and backing material. The backing independent values of the normalized PPE phase give the possibility to calculate fluid's thermal diffusivity. By monitoring the thickness of a fluid with well known properties, the thermal effusivity of a solid sample (backing material) can be measured.