Detection of multiple chemicals based on external cavity quantum cascade laser spectroscopy

Sun, Jiao; Ding, Jia; Liu, Ningwu; Yang, Ge

doi:10.1016/j.saa.2017.10.059

Cited by 23 publications

(17 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In order to realize standoff gas detection, a number of laser-based techniques are available, such as TDLAS [34,35,137,138], PAS [139], differential absorption lidar (DIAL) [140], CLaDS [141], and more recently active coherent laser spectrometers (ACLaS) [36]. The basic architectures of these techniques are shown in Figure 2.…”

Section: Open Path Detection Without Retroreflectorsmentioning

confidence: 99%

Mid-Infrared Tunable Laser-Based Broadband Fingerprint Absorption Spectroscopy for Trace Gas Sensing: A Review

Zhang

et al. 2019

Applied Sciences

130

View full text Add to dashboard Cite

The vast majority of gaseous chemical substances exhibit fundamental rovibrational absorption bands in the mid-infrared spectral region (2.5–25 μm), and the absorption of light by these fundamental bands provides a nearly universal means for their detection. A main feature of optical techniques is the non-intrusive in situ detection of trace gases. We reviewed primarily mid-infrared tunable laser-based broadband absorption spectroscopy for trace gas detection, focusing on 2008–2018. The scope of this paper is to discuss recent developments of system configuration, tunable lasers, detectors, broadband spectroscopic techniques, and their applications for sensitive, selective, and quantitative trace gas detection.

show abstract

Section: Open Path Detection Without Retroreflectorsmentioning

confidence: 99%

Mid-Infrared Tunable Laser-Based Broadband Fingerprint Absorption Spectroscopy for Trace Gas Sensing: A Review

Zhang

et al. 2019

Applied Sciences

130

View full text Add to dashboard Cite

show abstract

“…This is caused by the mechanical parts that are required to select the emitted wavelength and mode hops are a common issue. They are mainly used for measuring solids [32,33], liquids [34,35] or polyatomic gasses and vapors with broad absorption bands [36,37]. During the last decades, QCLs with distributed feedback (DFB) gratings [38] have proven as reliable light sources for gas phase spectroscopy.…”

Section: Design Considerations For the Multi-gas Sensormentioning

confidence: 99%

A Quantum Cascade Laser-Based Multi-Gas Sensor for Ambient Air Monitoring

Genner

Martín-Mateos

Moser

et al. 2020

Sensors

View full text Add to dashboard Cite

A quantum cascade laser-based sensor for ambient air monitoring is presented and five gases, affecting the air quality, can be quantified. The light sources are selected to measure CO, NO, NO2, N2O and SO2. The footprint of the measurement setup is designed to fit in two standard 19” rack (48 cm × 65 cm) with 4 height units (18 cm) whereas one is holding the optical components and the other one contains the electronics and data processing unit. The concentrations of the individual analytes are measured using 2f-Wavelength Modulation Spectroscopy (2f-WMS) and a commercially available multipass gas cell defines the optical path. In addition, CO can also be measured with a dispersion-based technique, which allows one to cover a wider concentration range than 2f-WMS. The performance of this prototype has been evaluated in the lab and detection limits in the range of 1ppbv have been achieved. Finally, the applicability of this prototype for ambient air monitoring is shown in a five-week measurement campaign in cooperation with the Municipal Department for Environmental Protection (MA 22) of Vienna, Austria.

show abstract

“…17 Because of the advantages of this method, after Alexander Graham Bell, this method was developed by various scientists such as Kreuaer 18 ; Viengerov 19 (in order to detect by IR source with high noise); Schafer et al 20 (in order to increase the quality factor of PA cells); Kerr and Atwood 21 (in order to measure the absorption spectrum of water vapor); Bernegger and Sigrist 22 (performed PA spectroscopy of gases and vapors for trace gas analysis); Besson et al 23,24 (provided PA spectroscopy setup by diode laser in order to detect CH 4 and HCl); Gondal and Yamani 25 (for ozone detection); Lima et al 26 (for high-sensitivity detection of 16 ppb ethylene and 42 ppb ammonia); Kumar et al 27,28 (to trace hazardous chemicals by Quantum cascade lasers (QCLs)); Mohebbifar et al 29 and Dibaee et al 30 (in order to obtain high-sensitive spectroscopy of SO 2 , NO 2 , and SF 6 ); Yufei Ma 31 and Yufei Ma et al 32 (for ppb-level detection of ammonia based on QEPAS); and so forth. [33][34][35][36] The PA spectroscopy is based on the absorption of light by the gas. The gas molecules that are exposed to electromagnetic wave are excited to a higher rotational, vibrational, or electronic quantum state.…”

Section: Theory Of Pa Spectroscopymentioning

confidence: 99%

High‐sensitivity detection and quantification of CHCl₃ vapors in various gas environments based on the photoacoustic spectroscopy

Mohebbifar

2019

Micro & Optical Tech Letters

View full text Add to dashboard Cite

In this study, the quality factor and cell constant vs acoustic resonator sizes in the first radial and longitudinal modes were calculated using our homemade simulation. Based on these simulations a photoacoustic (PA) spectroscopy system was designed, optimized, and finally fabricated as a high‐sensitivity gas sensor. The subsequent experiments have been done to online monitoring of the trichloromethane (CHCl3) vapors trace. The sensitivity of system for detection of CHCl3 vapors was measured 488 ppb. Corresponding PA signal for different concentrations of CHCl3 vapors is determined in the presence of N2, synthetic air, He, and Ar in various gas environments. It is shown that the effect of buffer gas and the relevant pressures are substantiated to achieve the minimum detectable concentration. In other words, using heavier gases at the same experimental conditions lead to detection of the lower concentrations. When the buffer gas of system was He, the lowest PA signal was recorded. This faint signal of He is due to vibrational‐translational processes of He, thermodynamic and acoustic properties of system such as cell constant, quality factor, speed of sound, thermal diffusion, thermal boundary layer, and viscous boundary layer for He. These properties for various buffer gases were calculated and discussed.

show abstract

Detection of multiple chemicals based on external cavity quantum cascade laser spectroscopy

Cited by 23 publications

References 30 publications

Mid-Infrared Tunable Laser-Based Broadband Fingerprint Absorption Spectroscopy for Trace Gas Sensing: A Review

Mid-Infrared Tunable Laser-Based Broadband Fingerprint Absorption Spectroscopy for Trace Gas Sensing: A Review

A Quantum Cascade Laser-Based Multi-Gas Sensor for Ambient Air Monitoring

High‐sensitivity detection and quantification of CHCl₃ vapors in various gas environments based on the photoacoustic spectroscopy

Contact Info

Product

Resources

About

Detection of multiple chemicals based on external cavity quantum cascade laser spectroscopy

Cited by 23 publications

References 30 publications

Mid-Infrared Tunable Laser-Based Broadband Fingerprint Absorption Spectroscopy for Trace Gas Sensing: A Review

Mid-Infrared Tunable Laser-Based Broadband Fingerprint Absorption Spectroscopy for Trace Gas Sensing: A Review

A Quantum Cascade Laser-Based Multi-Gas Sensor for Ambient Air Monitoring

High‐sensitivity detection and quantification of CHCl3 vapors in various gas environments based on the photoacoustic spectroscopy

Contact Info

Product

Resources

About

High‐sensitivity detection and quantification of CHCl₃ vapors in various gas environments based on the photoacoustic spectroscopy