Results 191 to 200 of about 1,542,742 (227)

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

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 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

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

Simultaneous Detection of Major Greenhouse Gases with Multiresonator Photoacoustic Spectroscopy.

Analytical Chemistry
Greenhouse gas (GHG) detection plays an important role in climate change research and industry applications. A novel photoacoustic spectroscopy (PAS) sensor based on multiple resonators has been developed for the detection of GHGs.
Jie Peng, Yuan Cao, Ruifeng Wang, Guishi Wang, J. Mei, Kun Liu, Weidong Chen, Xiaoming Gao   +7 more
semanticscholar   +1 more source

Optimization of a Microphone for Photoacoustic Spectroscopy

Applied Spectroscopy, 2003
The principles of optimizing a microphone for a photoacoustic detector in the nonresonant mode of operation are presented. Performance of the constructed optical cantilever microphone is compared to the commercial electret microphone by measuring the photoacoustic spectrum of methane with both systems.
Jyrki Kauppinen, Klaus M. Wilcken
openaire   +3 more sources

Dermatological photoacoustic spectroscopy

1981
Photoacoustic spectroscopy, a new and developing technique, has generated considerable interest as a spectroscopic tool for the studying of solid, semisolid and biological samples. This technique allows the depth profiles of both the optical and thermal properties of skin to be determined in cases where other techniques can be applied only with ...
E. Pines, T. Cunningham
openaire   +2 more sources