Review of Recent Advances in QEPAS-Based Trace Gas Sensing
Applied Sciences, 2018 Quartz-enhanced photoacoustic spectroscopy (QEPAS) is an improvement of the conventional microphone-based photoacoustic spectroscopy. In the QEPAS technique, a commercially available millimeter-sized piezoelectric element quartz tuning fork (QTF) is used
Yufei Ma
doaj +1 more source
Vibrational Fingerprinting of Gas Mixtures Using COCO-QEPAS. [PDF]
Sensors (Basel)Detection and simultaneous monitoring of multiple trace gases is vital in scientific and industrial processes. Here, we use coherent control in quartz-enhanced photoacoustic spectroscopy (COCO-QEPAS) with an in situ learning method for rapid ...
Angstenberger S +4 more
europepmc +2 more sources
Continuous wave optical parametric oscillator for quartz-enhanced photoacoustic trace gas sensing [PDF]
, 2007 A continuous wave optical parametric oscillator, generating up to 300 mW idler output in the 3–4 μm wavelength region, and pumped by a fiber-amplified DBR diode laser is used for trace gas detection by means of quartz-enhanced photoacoustic spectroscopy (
A. Henderson +33 more
core +6 more sources
Waterborne parasites in Uganda: A survey in Queen Elizabeth Protected Area
Public Health Challenges, Volume 2, Issue 4, December 2023., 2023 As water has a multitude of functions, encompassing culinary, hygienic and recreational applications, studies looking at potentially pathogenic waterborne pathogens are crucial in order to prevent disease spread to rural populations and tourists. This study aimed at detecting protozoan trophozoites/cysts, and helminth eggs in environmental and piped ...
Celsus Sente +6 more
wiley +1 more source
Sensors, 2020 A dual-gas sensor based on the combination of a quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor and an electronic hygrometer was realized for the simultaneous detection of methane (CH4) and water vapor (H2O) in air. The QEPAS sensor employed an
Arianna Elefante +8 more
doaj +1 more source
Passive Electrical Damping of a Quartz Tuning Fork as a Path to Fast Resonance Tracking in QEPAS
Sensors, 2021 In Quartz-Enhanced PhotoAcoustic Spectroscopy (QEPAS) gas sensors, the acoustic wave is detected by the piezoelectric Quartz Tuning Fork (QTF). Due to its high-quality factor, the QTF can detect very low-pressure variations, but its resonance can also be
Roman Rousseau +4 more
doaj +1 more source
Compact sound-speed sensor for quartz enhanced photoacoustic spectroscopy based applications [PDF]
, 2015 A compact sound-speed sensor based on a phase difference method was developed. The sensor employs a U-shaped stainless steel tube with two holes located on its front and back ends, which serves as a sound wave guide.
Dong, Lei, Liu, Kun, Tittel, Frank K.
core +1 more source
Mid-infrared Gas Sensing Using Graphene Plasmons Tuned by Reversible Chemical Doping [PDF]
, 2020 Highly confined plasmon modes in nanostructured graphene can be used to detect tiny quantities of biological and gas molecules. In biosensing, a specific biomarker can be concentrated close to graphene, where the optical field is enhanced, by using an ad-
Alani, Rose +4 more
core +3 more sources
QEPAS based ppb-level detection of CO and N2O using a high power CW DFB-QCL [PDF]
, 2013 An ultra-sensitive and selective quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor platform was demonstrated for detection of carbon monoxide (CO) and nitrous oxide (N2O). This sensor used a stateof- the art 4.61 μm high power, continuous wave
Bauer +32 more
core +1 more source
Compact all-fiber quartz-enhanced photoacoustic spectroscopy sensor with a 30.72 kHz quartz tuning fork and spatially resolved trace gas detection [PDF]
, 2016 An ultra compact all-fiber quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor using quartz tuning fork (QTF) with a low resonance frequency of 30.72 kHz was demonstrated.
He, Ying +5 more
core +1 more source