High-quality optical fibers can be produced now at a low cost and large quantity, and this
has further promoted the development of fiber-optic (chemical) sensors. After over 30 years …

Photoacoustic spectroscopy (PAS), which relies on the detection of absorption-induced
acoustic waves, is widely used for gas sensing. This paper summarizes and discusses most …

An integrated near-infrared fiber-optic photoacoustic sensing demodulator was established
for ultra-high sensitivity gas detection. The demodulator has capacities of interference …

Optical spectroscopy has a broad scientific basis in chemistry, physics, and material science,
with diverse applications in medicine, pharmaceuticals, agriculture, and environmental …

Fiber-optic photoacoustic (PA) sensing has important applications in trace gas detection.
The fiber-optic Fabry-Perot acoustic sensor implemented applying a cantilever is a novel …

An ultra-high sensitivity open-cavity Fabry–Perot interferometer (FPI) gas refractive index
(RI) sensor based on the photonic crystal fiber (PCF) and Vernier effect is proposed and …

An ultra-wideband fiber optic acoustic sensor based on graphene diaphragm with a
thickness of 10nm has been proposed and experimentally demonstrated. The two reflectors …

This paper presents an optimized T-type resonant photoacoustic (PA) cell for methane (CH
4) gas detection. The noise transmission coefficients and PA field distributions of the T-type …

This paper reports a mini-resonant photoacoustic sensor for high-sensitivity trace gas
sensing. The sensor primarily contains a sphere-cylinder coupled acoustic resonator, a …

In this paper, a novel single fiber-type double cavity enhanced photoacoustic spectroscopy
(SFDCE-PAS) sensor has been proposed and demonstrated for trace methane (CH 4) …