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Acoustic microresonators were added to the recently developed multi-QTF based QEPAS spectrophone to enhance the signal amplitude. Two kinds of “on-beam” configurations were experimentally investigated in detail. The developed multi-QTF based “on-beam” spectrophone had a signal enhancement of 1.6 times compared with the traditional single QTF based “on-beam” spectrophone, with the approximate noise level. A normalized noise equivalent absorption coefficient ( 1 σ ) of 1.24 × 10 −9 W·cm −1 ·Hz −1/2 was obtained for water vapor detection at atmospheric pressure.
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Zheng et al. (2015) studied this question.
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