Comparison of Photoacoustic Behaviors between Helmholtz Cell and its Remodified One

Abstract:

This paper presents method and performance of the Helmholtz photoacoustic resonant cell and its remodified one which both were designed and tested respectively based on the measurement of the CO₂ contribution of the photoacoustic signal in experiments. The average optical power at the laser operating point was 800mW for the10.653um laser (CO₂ detection). On-line and real time measurement CO₂/N₂ mixtures (CO₂ 300ppm) were then performed. The Helmholtz photoacoustic resonant cell and its remodified one test of the carbodioxide conducted at their respective resonant frequency demonstrated signals about 43mV and 67mV, signal-to-noise (S/N) values about 47dB and 51dB respectively. According to test results, the remodified one also has a better quality factor. All this demonstrate the remodified Helmholtz cell can preferably improve excitation of acoustical signal.

• Periodical: Advanced Materials Research (Volume 804)
• Pages: 251-255
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.804.251
• Online since: September 2013
• Authors: Jun Juan Zhao, Xian Hui Li, Wei Zhang, Zhan Zhao
• Keywords: Gas Detection, Helmholtz, Photoacoustic, Spectroscopy

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