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Random Multiple Scattering Enhanced Photoacoustic Gas Spectroscopy with Disordered Porous Ceramics
Haihong Bao1,2, Congzhe Zhang1,2, Yinping Miao1,2
1Department of Electrical Engineering , The Hong Kong Polytechnic University , Hung Hom, Kowloon , Hong Kong , China.
Abstract:
Light-gas interaction can be enhanced by using disordered porous materials because multiple random scattering increases light intensity near the surface of the material. Here we report signal enhancement of photoacoustic gas spectroscopy with disordered porous ceramics. The amplitude and frequency characteristics of photoacoustic signal due to gas absorption in disordered materials are modeled theoretically. Experiment with a porous Al2O3 sample demonstrates photoacoustic signal enhancement of ∼4 times at 5 kHz.
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