H2S detection by tunable diode laser absorption spectroscopy

Gas Sensors- A Review

“…Infrared gas sensors are use for detecting different gases like methane, ethane, propane, butane, benzene toluene, xylene and other alcohols like methanol, ethanol etc. H. Okajima et al [37] developed an Infrared gas sensor using LED for the measurement of methane, absorption of gas samples between 0-97 % were successfully measured, D. Garcia Romeo et al [38] developed a Non-Dispersive Infrared (NDIR) gas sensor for the measurement of CO 2 gas concentration for wireless sensor networks with low power consumption Similarly Dong Chen et al [39] designed a tunable diode laser absorption spectroscopy for the measurement of hydrogen sulfide gas. In order to produce a sensor that is miniaturized, Guangjun Zhang et al [40] developed a miniaturized CO 2 sensor based on infrared absorption.…”

Optical gas sensing of sub‐ppm SO 2 F 2 and SOF 2 from SF 6 decomposition based on photoacoustic spectroscopy

“…Recently, laser spectroscopy, such as Tunable Diode Laser Absorption Spectroscopy (TDLAS) and Photoacoustic Spectroscopy (PAS), has gradually become a hot spot in the field of optical gas sensing, and various techniques have been reported in the literature, such as special optical fibres that are potential gas chambers [12][13][14][15]. Chen et al developed an optical H 2 S sensor based on TDLAS with Wavelength Modulation Spectroscopy (WMS) and obtained the Minimum Detection Limit (MDL) of 20 ppm [16]. Chen et al used PAS to detect the H 2 S and it showed an MDL of 150 ppb within the integration time of 100 s [17].…”

“…Chen et al. developed an optical H 2 S sensor based on TDLAS with Wavelength Modulation Spectroscopy (WMS) and obtained the Minimum Detection Limit (MDL) of 20 ppm [16]. Chen et al.…”

H2S quartz-enhanced photoacoustic spectroscopy sensor employing a liquid-nitrogen-cooled THz quantum cascade laser operating in pulsed mode

“…The laser wavelength is resonant with vibrational or rotational transitions of the target molecule and the QTF can be designed on purpose in terms of size and resonance frequency to match the laser beam dimension and gas target relaxation rate, respectively [ 18 , 19 ]. The quartz tuning fork can properly work over a wide range of pressure and temperatures and can replace pyroelectric and photovoltaic/photoelectric sensors, that are mandatory for multipass cell or cavity enhanced-based techniques [ 15 , 20 , 21 ].…”