Absorption (acoustics)

Optics

Spectroscopy

Quantum mechanics

Absorption spectroscopy

Composite material

Wavelength

Optoelectronics

Broadband

Detector

Tunable laser

Trace gas

Organic chemistry

Tunable diode laser absorption spectroscopy

Infrared spectroscopy

Chemistry

Materials science

Physics

Infrared

Laser

Applied Sciences

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.

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