Low‐finesse fiber‐optic Fabry–Perot (F‐P) interferometric sensor has the advantages of high
sensitivity, anti‐electromagnetic interference, and compact size, and is one of the most …

All-optical light-induced thermoacoustic spectroscopy (AO-LITS) is reported for the first time
for highly sensitive and selective gas sensing, in which a commercial standard quartz tuning …

A phase interrogation method for a fiber-optic acoustic sensor based on a short-cavity
extrinsic Fabry-Perot interferometer (EFPI) is proposed with two wavelengths. A …

A common-path dual-wavelength phase demodulation technique for extrinsic Fabry–Perot
interferometric (EFPI) sensors is proposed on the basis of a broadly tunable modulated …

A phase-shifted demodulation technique with a 3× 3 coupler and ellipse fitting algorithm
(EFA) for the interrogation of interferometric sensors is proposed. To reduce the error of the …

Highlights•An out-of-plane vibration mode based QTF was used for off-axis Quartz
Enhanced Photoacoustic Spectroscopy (QEPAS).•The dual-wavelength FPI demodulation …

A single-wavelength passive phase-shifted demodulation technique for the interrogation of a
diaphragm-based fiber sensor is proposed. It is based on the configuration of the external …

An improved ellipse-fitting algorithm phase demodulation (EFAPD) technique is proposed to
reduce the influence of light source intensity noise on a system. In the original EFAPD, the …

A dual Fabry-Perot (FP) interferometric fiber-optic acoustic sensor based on sandwich-
structure composite diaphragm is proposed, where fixed phase difference is generated by …

In this Letter, we report a four-wavelength quadrature phase demodulation technique for
extrinsic Fabry–Perot interferometric (EFPI) sensors and dynamic signals. Four …