Results 41 to 50 of about 825 (180)
Anomalous Humidity Dependence in Photoacoustic Spectroscopy of CO Explained by Kinetic Cooling
Applied Sciences, 2020 Water affects the amplitude of photoacoustic signals from many gas phase molecules. In quartz-enhanced photoacoustic (QEPAS) measurements of CO excited at the fundamental vibrational resonance of CO, the photoacoustic signal decreases with increasing ...
Jakob Hayden +2 more
doaj +1 more source
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
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
Sensors, 2023 In this invited paper, a highly sensitive methane (CH4) trace gas sensor based on quartz-enhanced photoacoustic spectroscopy (QEPAS) technique using a high-power diode laser and a miniaturized 3D-printed acoustic detection unit (ADU) is demonstrated for ...
Yanjun Chen +3 more
doaj +1 more source
, 2022 S.2236-2237An IR-LED at 3.4 mum and an off-beam QEPAS cell as detector are utilized for absorption spectroscopy.
Schade, W., Böttger, S., Willer, U.
core +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
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