Results 51 to 60 of about 909 (177)
H2S near-IR QEPAS detection in complex gas matrices
, 2023 Hydrogen sulfide (H2S) is a harmful gas whose emissions are associated to natural gas leaks. Laser-based spectroscopy techniques have been demonstrated to be well suited for real time gas monitoring, providing high sensitivity and selectivity.
Sampaolo A. +6 more
core +1 more source
Quartz Enhanced Photoacoustic Detection Based on an Elliptical Laser Beam
Applied Sciences, 2020 A quartz enhanced photoacoustic spectroscopy (QEPAS) sensor system based on an elliptical laser beam for trace gas detection was demonstrated. A Powell lens was exploited to shape the circular laser beam into an elliptical laser beam for the full ...
Zhijin Shang +3 more
doaj +1 more source
Frontiers in Physics, 2022 A convenient method of light intensity correction for quartz-enhanced photoacoustic spectroscopy (QEPAS) using photothermal baseline is demonstrated. The laser beam passes through the prongs of the quartz tuning fork (QTF) and then focused on the root of
Xiang Chen +8 more
doaj +1 more source
Quartz-Enhanced Photoacoustic Spectroscopy: A Review
Sensors, 2014 A detailed review on the development of quartz-enhanced photoacoustic sensors (QEPAS) for the sensitive and selective quantification of molecular trace gas species with resolved spectroscopic features is reported.
Pietro Patimisco +3 more
doaj +1 more source
Applied Sciences, 2020 In this paper the performances of two spectrophones for quartz-enhanced photoacoustic spectroscopy (QEPAS)-based ethane gas sensing were tested and compared.
Fabrizio Sgobba +9 more
doaj +1 more source
Low noise, open-source QEPAS system with instrumentation amplifier [PDF]
Scientific Reports, 2019 Abstract Quartz enhanced photoacoustic spectroscopy (QEPAS) is a rapidly developing, ultrasensitive method for trace gas sensing. Adequate electronic amplifier, well matched to the quartz characteristics is crucial for overall system performance. Here we present an open source circuit for QEPAS signal amplification.
Mateusz Winkowski, Tadeusz Stacewicz
openaire +3 more sources
Photoacoustics, 2022 Resonant optical power buildup inside a high finesse cavity is exploited to boost the sensitivity in quartz-enhanced photoacoustic spectroscopy (QEPAS) for CO, N2O and H2O detection, operating at a wavelength of 4.59 µm.
Jakob Hayden +4 more
doaj +1 more source
Sensors, 2019 This paper reports on a portable selective chemical sensor for hazardous vapors at trace levels, which combines a two-stage purge and trap vapor pre-concentration system, a Micro-Electro-Mechanical-System (MEMS) based fast gas-chromatographic (FAST-GC ...
Stefano Zampolli +6 more
doaj +1 more source
Acoustic Detection Module Design of a Quartz-Enhanced Photoacoustic Sensor
Sensors, 2019 This review aims to discuss the latest advancements of an acoustic detection module (ADM) based on quartz-enhanced photoacoustic spectroscopy (QEPAS). Starting from guidelines for the design of an ADM, the ADM design philosophy is described.
Tingting Wei +3 more
doaj +1 more source
Hydrogen Halide Gas Sensors: Active Materials, Operation Principles, and Emerging Technologies
Interdisciplinary Materials, Volume 5, Issue 1, Page 85-123, January 2026.This review considers hydrogen halide (HX) gas sensors across functional materials and principles: acoustic, chemical, optical and nanophotonic. The strong acidity and reactivity of HX gases are discussed as constraints for stability and selectivity of these devices.
Xiuzhen Liu +12 more
wiley +1 more source