Richard Lab:Review of photoacoustic sensing
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| basics | in a photoacoustic sensor a gas sample is imported to a chamber where it is trapped, and pulsed with a infra red light, at a wave legth range specific to the gas being measured. The wave length range is created by passing the IR light through a filter. The IR pulse causes the gases volume to change at every pulse, creating a pressure change pattern detected by a microphone placed in the sample chamber. The resulting sound wave varies with the concentration of the measured gas, which is interpolated through a calibration curve. In the Innova gas monitor (Innova, DK), the calibration curve is programmed into the sensor and the gas concentration is automatically output. | . |
| High sensitivity in gas analysis with photoacoustic detection. Jyrki Kauppinen, Klaus Wilcken, Ismo Kauppinen and Vesa Koskinen . Department of Physics, University of Turku, Vesilinnantie 5, FIN-20014, Turku, Finland . Microchemical Journal. Volume 76, Issues 1-2, February 2004, Pages 151-159 Available http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6W6H-4BWVSYB-D&_user=209810&_coverDate=02%2F29%2F2004&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000014439&_version=1&_urlVersion=0&_userid=209810&md5=cdfae792a0380525f4a59512fce27a99#fig1 10 March 2004. | Replacing the microphone with a new type of pressure sensor inreased the sensitivity of a photoacoustic sensor; it detected methane at lower than 1 ppb. The article also includes a good introduction on photoacoustic sensing. | Hala |
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