Optical EngineeringThermal wave pyroelectric thin film hydrogen sensor with extended detection dynamic range
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A novel thermal wave based pyroelectric thin film solid state sensor shown to be capable of responding to H2 gas flows in N2 or in air under ambient temperature and pressure conditions is described. The new sensor exhibits an extremely wide detection dynamic range: 100% to 25 ppm hydrogen in nitrogen, and a 10 to 90% signal rise time of approximately 10 s, limited by the inertia of the gas delivery system. The extended dynamic range is achieved through two complementary operating mechanisms, resulting in a thermophysical and a chemical response at high and low H2 concentrations, respectively.