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 …

The global trends of urbanization and industrialization have given rise to critical
environmental and air pollution issues that often receive insufficient attention. Among the …

Radars and lidars are two primary sensor modalities complementing optical cameras in
active safety and autonomous driving applications. Radars and lidars operate at …

We report here the first implementation of chemically specific imaging in the exhaust plume
of a gas turbine typical of those used for propulsion in commercial aircraft. The method used …

Laser absorption spectroscopy (LAS) is a promising diagnostic method capable of providing
high-bandwidth, species-specific sensing, and highly quantitative measurements. This …

Chemical species tomography (CST) has been widely applied for the imaging of critical gas-
phase parameters in industrial processes. To acquire high-fidelity images, CST is typically …

This paper proposes a novel and rapid calibration-free wavelength modulation spectroscopy
algorithm based on even-order harmonics. The proposed algorithm, analytically deduced …

In this invited paper, a compact dense-pattern multipass cell-based near-infrared sensor
system was demonstrated for detection of parts-per-billion in volume (ppbv)-level methane …

We propose a second harmonic phase angle method (WMS-) based on wavelength
modulation spectroscopy for trace gas detection. WMS-exhibits the advantages of …

Inspired by the empirical mode decomposition (EMD)-enhanced gas detection work, this
paper develops a further improved signal reconstruction method (namely EWT-ASG) for the …