Monitoring Leaking Gases by Op-Ftir Remote Sensing

Abstract

Measurement of leaking gases using Open Path Fourier Transform Infrared (OP-FTIR) spectroscopy was carried out in this study to acquire Path Integrated Concentration (PIC) data. Three hazardous Volatile Organic Compounds (VOCs) namely methylene chloride, chloroform and acetone were analyzed. For the two-component leaking source, the PIC data were easily obtained through ordinary calculation and compared to those obtained from Artificial Neural Network (ANN). When the leaking source was composed of three VOCs whose characteristic peaks interfere with each other, it was necessary to do spectral correction for multicomponent analysis with ANN. The Absorbance-Wavenumber-Time 3D spectra of the leaking sources and concentration variations with the leaking time were plotted. The results showed that OP-FTIR is a good quantitative analytical method for indoor or field air pollution. Further more, the remote sensing OP-FTIR system could be utilized to continuously monitor many more toxic gases and work as an alert system for the real time monitoring of hazardous gases beyond normal working conditions of various kinds of areas, such as living or industrial areas.

Development of on-line FTIR spectroscopy for siloxane detection in biogas to enhance carbon contactor management

“…Lechner et al (2001) also reported positive interference when developing a method to discriminate compounds which absorb in similar spectral regions, finding difficulty differentiating between different alcohols, acetates and methyl-alkanes in air from the production hall of a recycling centre. Such analyses ostensibly require more complex analytical methods to incorporate spectral correction that allows for interference (Li et al, 2002). Consequently, the infrared spectra in this study were reanalysed using a PLS method as this is considered to be more effective for complex mixtures (Stuart, 2004).…”

Chinese vinegar classification via volatiles using long-optical-path infrared spectroscopy and chemometrics

“…Infrared spectroscopy is an effective tool for analyzing unknown gases and has been widely used in qualitative and quantitative measurements of automobile exhaust (Sebih et al, 2010;White et al, 2011;Yamamoto et al, 2011), harmful gas leaks (Harig et al, 2005(Harig et al, , 2007Li et al, 2002) and greenhouse gas emissions (Gardiner et al, 2008;Geibel et al, 2010;TsanChang et al, 2000), among other applications. Compared with GC-MS and many other laboratory analytical methods, infrared spectroscopy is more flexible and can realize non-destructive, real-time and continuous tests as well as remote-sensing measurements (Bacsik et al, 2006;Marshall et al, 1994;Ross & Todd, 2002).…”

Effect of synthesis methods on the acetone sensing behaviour of fluorescent carbon dots

“…Chromatographic methods were often used to detect acetone in conventional analytic techniques [5]. Other reported techniques include FTIR spectroscopy [6] and ion mobility spectrometry [7], which typically needed complicated apparatus, with the sample being pre-treated for a long time, and the response was fairly sluggish. The recent development of fluorescent sensors, whose basis was often on metal-organic frameworks (MOF) or coordination polymers (CPS), also aimed to detect acetone.…”