Chemical sensors methane

Werle P, Kormann R. 2001. A fast chemical sensor for eddy correlation measurements of methane emissions from rice paddy fields . Appl. Opt. 40(6) 846-858. 

Figure 8 Typical fingerprint mass spectra for a peppermint oil obtained using an Agilent MS chemical sensor in three different modes (a) electron impact ionization, (b) positive chemical ionization with methane reagent gas, and (c) positive chemical ionization with ammonia reagent gas.

Methane Gas chromatography Infrared analyzer Treatment of biogas with lime Chemical sensors Alzate-Gaviria et al. (2007) Liu et al. (2004) Rozzi and Remigi (2004) Nordberg et al. (2000)... 

In this manner, a nearly universal and very nonselective detector is created that is a compromise between widespread response and high selectivity. For example, the photoionization detector (PID) can detect part-per-billion levels of benzene but cannot detect methane. Conversely, the flame ionization detector (FID) can detect part-per-billion levels of methane but does not detect chlorinated compounds like CCl very effectively. By combining the filament and electrochemical sensor, all of these chemicals can be detected but only at part-per-million levels and above. Because most chemical vapors have toxic exposure limits above 1 ppm (a few such as hydrazines have limits below 1 ppm), this sensitivity is adequate for the initial applications. Several cases of electrochemical sensors being used at the sub-part-per-million level have been reported (3, 16). The filament and electrochemical sensor form the basic gas sensor required for detecting a wide variety of chemicals in air, but with little or no selectivity. The next step is to use an array of such sensors in a variety of ways (modes) to obtain the information required to perform the qualitative analysis of an unknown airborne chemical. 

Cosofret, et al. Passive infrared imaging sensor for standoff detection of methane leaks. Chemical and Biological Standoff Detection II, Proceedings of SPIE, vol. 5584, 93-99 (2004)... 

Lu, Y. J., Li, J., Han, J., Ng, H. T., Binder, C., Partridge, C. and Meyyappan, M. (2004) Room temperature methane detection using palladium loaded single-walled carbon nanotube sensors . Chemical Physics Letters, 391(4-6), 344-348. 

Madou MJ, Morrison SR (1989) Chemical sensing with solid state devices. Academic Press, San Diego, CA, London Mandayo GG, Castano E, Gracia FJ, Qrera A, Cornet A, Morante JR (2003) Strategies to enhance the carbon monoxide sensitivity of tin oxide thin films. Sens Actuators B Chem 95 90-96 Massok P, Loesch M, Bertrand D (1995) Comparison for the between two Figaro sensors (TGS 813 and TGS 842) for the detection of methane, in terms of selectivity and long-term stability. Sens Actuators B Chem 24-25 525-528 Matsuura Y, Takahata K (1991) Stabilization of SnO sintered gas sensors. Sens Actuators B Chem 5 205-209 Meixner H, Lampe U (1996) Metal oxide sensors. Sens Actuators B Chem 33 198-202... 

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