The concentration of trace gases in the atmospheric environment is extremely low, but it has
a great impact on the living environment of organisms. Photoacoustic spectroscopy has …

Carbon dioxide (CO 2) is a colorless and odorless gas. The imbalanced CO 2
concentrations can have detrimental effects, therefore numerous CO 2 gas sensors have …

A trace-gas sensor, based on quartz-enhanced photoacoustic spectroscopy (QEPAS),
consisting of two acoustically coupled micro-resonators (mR) with an off-axis 20 kHz quartz …

Nitrogen dioxide (NO2) is a poisonous trace gas that requires monitoring in urban areas.
Accurate measurement in sub-ppm concentrations represents a wide application field for …

We demonstrate the usefulness of a nanosecond-pulsed single-mode mid-infrared (MIR)
optical parametric oscillator (OPO) for photoacoustic (PA) spectroscopic measurements. The …

We demonstrate an online (in-situ) sensor for continuous detection of oil contamination in
compressed air systems complying with the ISO-8573 standard. The sensor is based on the …

This work proposes the feasibility of an ultraviolet (UV) photoacoustic (PA) gas sensing
system based on an innovative resonant PA cell structure. The system design exploits the …

Chemically reactive short‐lived atmospheric species play a crucial role in tropospheric
processes that affect regional air quality and global climate change. Contrary to long‐lived …

An all-optical detection method for the detection of acoustic pressure waves is
demonstrated. The detection system is based on a stripped (bare) single-mode fiber. The …

A photoacoustic (PA) sensor based on higher-order acoustic modes is demonstrated. The
PA sensor is designed to enhance the gas detection performance and simultaneously …