Figure | A summary of various approaches for improving QEPAS technology. (IMAGE)

Light Publishing Center, Changchun Institute of Optics, Fine Mechanics And Physics, CAS

Figure | A summary of various approaches for improving QEPAS technology.

Caption

Figure | A summary of various approaches for improving QEPAS technology.  Currently, there are several approaches to enhance the performance of QEPAS systems: 1) using high-power laser to actuate more gas molecules achieve absorption; 2) applying novel excitation source with strong absorption coefficient to strengthen the absorption; 3) utilizing a custom QTF to increase detected signal; 4) employing acoustic resonator to amplify acoustic wave or adopting multi-pass structure to generate multiple acoustic wave source. The various configurations of state-of-the-art QEPAS systems are summarized in the figure.

Credit

Yufei Ma et al.

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