Quantum cascade lasers (QCL) are the first room temperature semiconductor laser source
for the mid-IR spectral region, triggering substantial development for the advancement of …

A rapid photoacoustic (PA) exhaust gas analyzer is presented for simultaneous
measurements of nitrogen dioxide (NO2) and sulfur dioxide (SO2). A laser diode (LD) …

Semiconductor materials with wide bandgaps are extensively employed for gas detection
due to their advantages of low cost, high sensitivity, fast speed, excellent stability, and …

A cantilever enhanced fiber-optic photoacoustic microprobe with the cavity volume of only
119 μL is designed to detect SO 2, which has the obvious advantages of passive sensing …

Quantum cascade laser (QCL) frequency combs are a promising candidate for chemical
sensing and biomedical diagnostics,,–. They are electrically pumped and compact, making …

A sensitive photoacoustic sensor system for the detection of ppb-level sulfur dioxide (SO2)
was developed by the use of a continuous-wave room-temperature, high-power quantum …

Radial-cavity quartz-enhanced photoacoustic spectroscopy (RC-QEPAS) was proposed for
trace gas analysis. A radial cavity with (0, 0, 1) resonance mode was coupled with the quartz …

A compact gas sensor system based on quartz-enhanced photoacoustic spectroscopy
(QEPAS) employing a continuous wave (CW) distributed feedback quantum cascade laser …

An optical cavity can be utilized as an excellent transducer for highly sensitive gas detection
with the application of photothermal spectroscopy, featuring the beneficial property of an …

A compact ppb-level SO_2 photoacoustic sensor was developed for the application of SF_6
decomposition detection in electric power systems. The selection of the SO_2 target …