Multi-Quartz Enhanced Photoacoustic Spectroscopy with Different Acoustic Microresonator Configurations

الملخص EN

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.