Improving the Signal to Noise Ratio of QTF Preamplifiers Dedicated for QEPAS Applications
Applied Sciences, 2020 The signal-to-noise ratio (SNR) is a major factor that limits the detection sensitivity of quartz-enhanced photoacoustic spectroscopy (QEPAS) sensors. The higher the electrical signal level compared to the noise amplitude is the lower the concentration ...
Piotr Z. Wieczorek +2 more
doaj +3 more sources
Recent Advances in QEPAS and QEPTS Based Trace Gas Sensing: A Review
Frontiers in Physics, 2020 This invited review paper summarizes and discusses developments of QTF based state-of-the-art quartz-enhanced photoacoustic spectroscopy (QEPAS) and quartz-enhanced photothermal spectroscopy (QEPTS) gas sensing techniques over the past 3 years.
Yufei Ma
doaj +3 more sources
Effect of gas turbulence in quartz-enhanced photoacoustic spectroscopy: A comprehensive flow field analysis [PDF]
PhotoacousticsHere we present a computational and experimental fluid dynamics study for the characterization of the flow field within the gas chamber of a Quartz-Enhanced Photoacoustic Spectroscopy (QEPAS) sensor, at different flow rates at the inlet of the chamber ...
Andrea Zifarelli +9 more
doaj +2 more sources
Sub-ppb level HCN photoacoustic sensor employing dual-tube resonator enhanced clamp-type tuning fork and U-net neural network noise filter [PDF]
PhotoacousticsHydrogen cyanide (HCN) is a toxic industrial chemical, necessitating low-level detection capabilities for safety and environmental monitoring. This study introduces a novel approach for detecting hydrogen cyanide (HCN) using a clamp-type custom quartz ...
Lihao Wang +11 more
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A Miniaturized QEPAS Trace Gas Sensor with a 3D-Printed Acoustic Detection Module
Sensors, 2017 A 3D printing technique was introduced to a quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor and is reported for the first time. The acoustic detection module (ADM) was designed and fabricated using the 3D printing technique and the ADM volume ...
Xiaotao Yang +4 more
doaj +3 more sources
Comparison and excitation optimization of commercial quartz tuning forks for QEPAS
Frontiers in PhysicsQuartz-enhanced photoacoustic spectroscopy (QEPAS) is a powerful technique for trace gas sensing, in which the quartz tuning fork (QTF) plays a key role in determining detection performance.
Lei Peng +5 more
doaj +2 more sources
Influence of Tuning Fork Resonance Properties on Quartz-Enhanced Photoacoustic Spectroscopy Performance [PDF]
Sensors, 2019 A detailed investigation of the influence of quartz tuning forks (QTFs) resonance properties on the performance of quartz-enhanced photoacoustic spectroscopy (QEPAS) exploiting QTFs as acousto-electric transducers is reported.
Huadan Zheng +15 more
doaj +3 more sources
A novel signal processing approach enabled by machine learning for the detection and identification of chemical warfare agent simulants using a GC-QEPAS system. [PDF]
Forensic Sci ResThe detection and identification of chemical warfare agents (CWAs) present challenges in emergency response scenarios and for safety and security applications.
Liberatore N +4 more
europepmc +2 more sources
A high sensitive methane QEPAS sensor based on self-designed trapezoidal-head quartz tuning fork and high power diode laser. [PDF]
PhotoacousticsA high sensitive methane (CH4) sensor based on quartz-enhanced photoacoustic spectroscopy (QEPAS) using self-designed trapezoidal-head quartz tuning fork (QTF) and high power diode laser is reported for the first time in this paper.
Ma H, Chen Y, Qiao S, He Y, Ma Y.
europepmc +2 more sources
1D U-Net Enhanced QEPAS Sensor for Trace Water Vapor Detection
OpticsWe report a deep learning-assisted quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor for trace water vapor detection in air. A 1392 nm butterfly-packaged DFB laser is wavelength-modulated at f0/2, and the QEPAS signal is retrieved by second ...
Huiming Xiao +13 more
doaj +2 more sources