FIG 1 (IMAGE)
Caption
Fig. 1 The simulation of stress distribution in QEPAS: (a) standard QTF, (b) four-prong QTF.
As the standard QTF was primarily designed for time reference rather than spectral applications, three characteristics of the standard QTF limit its effectiveness in QEPAS and LITES sensors. Firstly, the high resonant frequency (f0) of 32.768 kHz adversely influences the effective generation of photoacoustic signal while detecting molecules with a slow Vibration-Translation relaxation. Secondly, the high f0 also results in a relatively short energy accumulation time of the sensor, leading to a reduced amplitude of the system signal. Thirdly, the narrow prong gap spacing of the standard QTF leads to significant optical noise.
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