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Creators/Authors contains: "Sampaolo, Angelo"

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  1. ; ; ; ; ; ; ; ; ; (, Applied Sciences)
    In this paper the performances of two spectrophones for quartz-enhanced photoacoustic spectroscopy (QEPAS)-based ethane gas sensing were tested and compared. Each spectrophone contains a quartz tuning fork (QTF) acoustically coupled with a pair of micro-resonator tubes and having a fundamental mode resonance frequency of 32.7 kHz (standard QTF) and 12.4 kHz (custom QTF), respectively. The spectrophones were implemented into a QEPAS acoustic detection module (ADM) together with a preamplifier having a gain bandwidth optimized for the respective QTF resonance frequency. Each ADM was tested for ethane QEPAS sensing, employing a custom pigtailed laser diode emitting at ~1684 nm as the exciting light source. By flowing 1% ethane at atmospheric pressure, a signal-to-noise ratio of 453.2 was measured by implementing the 12.4 kHz QTF-based ADM, ~3.3 times greater than the value obtained using a standard QTF. The minimum ethane concentration detectable using a 100 ms lock-in integration time achieving the 12.4 kHz custom QTF was 22 ppm. 
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  2. ; ; ; ; ; ; ; ; (, Sensors and Actuators B: Chemical)
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  3. ; ; ; ; ; ; ; ; ; ; et al (, Photoacoustics)
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  4. ; ; ; ; ; ; ; ; ; ; et al (, Analytical Chemistry)
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  5. ; ; ; ; ; ; ; ; ; ; et al (, Optics Express)
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