Results 131 to 140 of about 1,607 (170)

Detecting parts-per-billion carbon monoxide with an ultra-enhanced near-infrared photoacoustic sensor. [PDF]

Photoacoustics
Cheng Y, Chen T, Zhang R, He S.
europepmc   +1 more source

Detection technologies and sensing systems for crop pest identification and infestation severity prediction: a review. [PDF]

Front Plant Sci
Chen T, Wang Y, Dang J, Zhang F, Wang C.
europepmc   +1 more source

Resonant Capacitive MEMS Coupled to a T-Shaped Acoustic Cavity for Enhanced Photoacoustic Gas Detection. [PDF]

Sensors (Basel)
Pages F, Charensol J, Seoudi T, Goutorbe J, Laporte L, Ayache D, Naoum FA, Rosenkrantz E, Vicet A, Bahriz M.   +9 more
europepmc   +1 more source

Optimization of spectrophone performance for quartz-enhanced photoacoustic spectroscopy

Sensors and Actuators B: Chemical, 2012
Abstract We numerically investigate the effects of spectrophone parameters, including the operating acoustic frequency, the relative position of the quartz tuning fork and the excitation laser beam, the gap between the resonant tubes and the tuning fork, and the diameter and length of the resonant tubes, on the performance of gas sensors based on ...
Yingchun Cao, Hoi Lut Ho
exaly   +3 more sources

In-plane quartz-enhanced photoacoustic spectroscopy

Applied Physics Letters, 2020
An optical gas sensing technique based on in-plane quartz-enhanced photoacoustic spectroscopy (IP-QEPAS) is reported. In IP-QEPAS, the laser beam is aligned in the plane of the quartz tuning fork (QTF) to increase the interaction area between the acoustic wavefront and the QTF.
Yufei Ma, Shunda Qiao, Pietro Patimisco, Angelo Sampaolo, Yao Wang, Frank K. Tittel, Vincenzo Spagnolo   +6 more
core   +4 more sources

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Radial-cavity quartz-enhanced photoacoustic spectroscopy

Optics Letters, 2021
Radial-cavity quartz-enhanced photoacoustic spectroscopy (RC-QEPAS) was proposed for trace gas analysis. A radial cavity with (0,0,1) resonance mode was coupled with the quartz tuning fork (QTF) to greatly enhance the QEPAS signal and facilitate the optical alignment.
Haohua Lv, Huadan Zheng, Yihua Liu, Zhifei Yang, Qian Wu, Haoyang Lin, Baiyang Antonio Zhou Montano, Wenguo Zhu, Jianhui Yu, Ruifeng Kan, Zhe Chen, Frank K. Tittel   +11 more
openaire   +2 more sources

Helmholtz-resonator quartz-enhanced photoacoustic spectroscopy

Optics Letters, 2023
In this work, Helmholtz-resonator quartz-enhanced photoacoustic spectroscopy (HR-QEPAS) was developed for trace gas sensing. A pair of Helmholtz resonators with high-order resonance frequency was designed and coupled with a quartz tuning fork (QTF).
Huijian Luo, Chenglong Wang, Haoyang Lin, Qian Wu, Zhifei Yang, Wenguo Zhu, Yongchun Zhong, Ruifeng Kan, Jianhui Yu, Huadan Zheng   +9 more
openaire   +2 more sources

Differential quartz-enhanced photoacoustic spectroscopy

Applied Physics Letters, 2023
In this paper, a differential quartz-enhanced photoacoustic spectroscopy (D-QEPAS) sensor is reported. The differential photoacoustic cell (PAC) was used to generate the photoacoustic effect. Two quartz tuning forks (QTFs) with a quality factor (Q) up to 10 000 were used as the acoustic wave transducers. The signal of D-QEPAS sensor was doubly enhanced
Chu Zhang, Shunda Qiao, Ying He, Sheng Zhou, Lei Qi, Yufei Ma   +5 more
openaire   +1 more source

Quartz-enhanced photoacoustic spectroscopy for hydrocarbon trace gas detection and petroleum exploration

Fuel, 2020
Quartz-enhanced photoacoustic spectroscopy represents a valuable candidate for natural gas analysis in the oil & gas field. The core element of this spectroscopy technique is a quartz tuning forks, employed as high quality-factor optoacoustic ...
Angelo Sampaolo, Giansergio Menduni, Pietro Patimisco   +2 more
exaly   +3 more sources