Optimization of the Photopyroelectric Hydrogen Gas Sensor: Geometry and Temperature Measurements

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Abstract
A new study towards the optimization of a new photopyroelectric hydrogen detector is performed. It has been found that the thickness of the palladium layer evaporated on the active polyvinylidene fluoride (PVDF) film plays an important role in the sensitivity of the device, but it does not influence the time response. In an effort to better understand the thermodynamics of the device during the solid-gas exchange interaction, the influence of ambient temperature has been studied. Further experiments have demonstrated device sensitivity to hydrogen even at cryogenic temperatures.