An ultrahigh sensitive trace gas sensing system was presented with dual cantilever-based
differential photoacoustic detection. By combining the double enhancement of multipass …

A ppbv-level mid-infrared photoacoustic spectroscopy sensor was developed for mouth
alcohol tests. A compact CO 2 laser with a sealed waveguide and integrated radio frequency …

A miniaturized optical fiber photoacoustic gas sensor enhanced by dense multibutterfly
spots is reported for the first time. The principle of space light transmission of neglecting …

A fiber-optic photoacoustic CO sensor for gas insulation equipment is proposed, which relies
on F–P interferometric cantilever-based differential lock-in amplification and optical …

Infrared laser photo-acoustic spectroscopy provides very high sensitivity of a gas sample
analysis when high-power tunable laser radiation sources and resonant photo-acoustic …

A neotype fiber optic photoacoustic gas sensor with overlapping phantom spots based multi-
pass is proposed, which greatly improves the reflection times and the length of gas …

A near-infrared (NIR) sub-ppm level photoacoustic sensor for hydrogen sulfide (H_2S) using
a differential Helmholtz resonator (DHR) as the photoacoustic cell (PAC) was presented …

Infrared absorption spectroscopy (IAS) is currently a powerful tool for gas sensing. Gas
sensors based on IAS show advantages of high sensitivity, good selectivity and in-situ …

We report the development of swept cavity-enhanced photoacoustic spectroscopy using a
quartz tuning fork for ultra-sensitive and high-resolution molecular spectroscopy. By using a …

Detection of dissolved gases in oceans is critically needed for global carbon cycle
investigation. However, most in situ optical detection techniques, as far as we know, have …