Results 261 to 270 of about 1,542,807 (290)

Advances in differential photoacoustic spectroscopy for trace gas detection

Microwave and optical technology letters (Print), 2022
Photoacoustic spectroscopy (PAS), as a nondestructive method, permits high sensitivity and selectivity in trace gas detection fields. Advances in differential PAS configurations have dramatically suppressed the background noise and triggered the ...
Le Zhang, Lixian Liu, Yanyan Liu, Xueshi Zhang, Huiting Huan, Xukun Yin, Teli Xi, Xiaopeng Shao   +7 more
semanticscholar   +1 more source

Study on Photoacoustic Spectroscopy Detection of CO in Gas Insulation Equipment

IEEE transactions on dielectrics and electrical insulation, 2022
The related regulations for electric power industry stipulate that CO gas is an important component to be detected when analyzing the gas composition of SF6 equipment.
Zhenwei Chen, Xiaoxing Zhang, Hongtu Cheng, Yin Zhang, Tingli Yang, Yangxiaoge Zhang   +5 more
semanticscholar   +1 more source

All-Optical Photoacoustic Spectroscopy-Based Dual-Component Greenhouse Gas Analyzer.

Analytical Chemistry
To achieve high sensitivity detection of dual-component greenhouse gases carbon dioxide and methane simultaneously, a multimechanism synergistic enhanced all-optical photoacoustic spectroscopy gas analyzer is presented.
Min Guo, Mengda Zhou, Beilei Yang, Xinyu Zhao, Chenxi Li, Qing Yu, Guangyin Zhang, Zebo Fang, Ke Chen   +8 more
semanticscholar   +1 more source

Single Fiber-Type Double Cavity Enhanced Photoacoustic Spectroscopy Sensor for Trace Methane Sensing

Journal of Lightwave Technology
In this paper, a novel single fiber-type double cavity enhanced photoacoustic spectroscopy (SFDCE-PAS) sensor has been proposed and demonstrated for trace methane (CH4) sensing.
Guo-Xiong Wu, Jiawei Xing, Z. Gong, Junsheng Ma, Yeming Fan, Xue Wu, Wei Peng, Qingxu Yu, Liang Mei   +8 more
semanticscholar   +1 more source

Advances in fiber‐based quartz enhanced photoacoustic spectroscopy for trace gas sensing

Microwave and optical technology letters (Print), 2021
Fiber‐based quartz enhanced photoacoustic spectroscopy (QEPAS) is a method for trace gas sensing with excellent properties such as high sensitivity and strong applicability. It has received extensive attention and become particularly attractive in recent
Wei-dong Feng, Y. Qu, Yachen Gao, Yufei Ma   +3 more
semanticscholar   +1 more source

Photoacoustic spectroscopy of solids

The Journal of the Acoustical Society of America, 1973
There are a great many substances, both organic and inorganic, that, because of their physical state, cannot be readily studied by conventional absorption or reflection techniques. In photoacoustic spectroscopy, light absorbed by the sample is converted into a measurable acoustic signal, and spectra closely corresponding to optical absorption spectra ...
openaire   +5 more sources

Photothermal and photoacoustic spectroscopy

Journal of Molecular Structure, 1988
Abstract Photothermal and photoacoustic spectroscopy rely on the detection of thermal or acoustic waves generated by the absorption of optical radiation and subsequent radiationless deexcitation. The principles of these spectroscopic techniques as well as most recent experimental developments are discussed.
J.F. McClelland, H. Coufal
openaire   +2 more sources

Photoacoustic spectroscopy with condensed samples

Applied Optics, 1976
A discussion of the photoacoustic spectroscopy of condensed matter is presented with emphasis on the role of the sample and the sample cell in the photoacoustic signal waveform. The spectrometer and sample cell are described, and an experimental evaluation of the system performance is given.
Richard N. Kniseley, John F. McClelland
openaire   +3 more sources

Multi-pass quartz-enhanced photoacoustic spectroscopy-based trace gas sensing.

Optics Letters, 2021
A multi-pass quartz-enhanced photoacoustic spectroscopy (MP-QEPAS)-based trace gas sensor is reported. In MP-QEPAS, a multi-pass laser beam pattern through the prong spacing of a quartz tuning fork (QTF) is obtained by means of two right-angle prisms.
Shunda Qiao, Yufei Ma, P. Patimisco, A. Sampaolo, Ying He, Ziting Lang, F. Tittel, V. Spagnolo   +7 more
semanticscholar   +1 more source

Photoacoustic Spectroscopy — Photoacoustic and Photothermal Effects

1990
Definition. Photoacoustic (PA) or optoacoustic measurements in the original, strict sense comprise the detection of acoustic waves which arise from non-radiative de-excitation (radiationless transition) of the sample as a consequence of absorption of continuously amplitude-modulated light.
C. Buschmann, H. Prehn
openaire   +2 more sources