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Hydrogen sensors are of increasing importance as hydrogen gas is a promising alternative as an energy carrier. Unfortunately, hazardous leaks have to be detected quickly and safely since hydrogen is highly explosive for concentrations in the air within 4 and 75%. This article reports the experimental results of a new scheme of hydrogen detection based on a nanostructured catalyst PdPt/Al2O3, a Surface Acoustic Wave (SAW) transducer in a differential configuration, and a signal conditioning circuit. The results show that the scheme of detection presents a linear response, a sensitivity of 5,41V/%(H2) and a low drift, in the range of 0.2 – 2%, with a response time estimated to 10 seconds.

GS9.2 - Hydrogen sensor based on a delay path SAW transducer and a nanostructured catalyst