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A hydrogen sensor is reported in which a small piezoelectric-sound-resonance-cavity (PSRC) is used as the sensing element. Detection utilizes sound resonance and acoustic property differences between H2 and air as a sensing mechanism. Changes in H2 concentration result in a shift of the sound-resonance state of the PSRC. Preliminary experiments have demonstrated a sensitivity limit of 8 ppm, a fast response time ∼1.5 second, and detection capabilities over a broad concentration range 10−5
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Dong et al. (2003) studied this question.
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