'Baseline-offset' scheme for a methane remote sensor based on wavelength modulation spectroscopy. (27th June 2016)

• Record Type: Journal Article
• Authors: Ding, Wuwen; Sun, Liqun; Yi, Luying; Zhang, Enyao
• Is Part Of: Measurement science & technology. Volume 27:Number 8(2016:Aug.)
• Publication Date: 2016-06-27
• Subjects: remote sensing and sensors -- backscattering -- spectroscopy -- diode lasers -- laser sensors; Physical measurements -- Periodicals; Scientific apparatus and instruments -- Periodicals; Equipment and Supplies -- Periodicals; Science -- instrumentation -- Periodicals; Technology -- instrumentation -- Periodicals; Mesures physiques -- Périodiques; Physical measurements; Scientific apparatus and instruments; Periodicals; 502.87
• DOI: 10.1088/0957-0233/27/8/085202
• Languages: English
• ISSNs: 0957-0233

Abstract

Abstract: A new scheme for methane remote sensing is presented. Unlike a standard published remote sensor based on wavelength modulation spectroscopy (WMS), a reference cell is inserted into the measuring optical path. This scheme inherits the merits of WMS and can achieve high signal-to-noise ratio especially in a low concentration environment. Experimental results show that the presented remote sensor can detect ambient methane with a detection limit of 5 ppm m (parts per million · meter) at a distance of 10 m and 16 ppm m for 20 m. A methane leak test shows the sensor can detect a methane leak of 15 ml min −1 within a range up to 37 m.