Results 31 to 40 of about 21,982 (208)

High-sensitivity all-optical PA spectrometer based on fast swept laser interferometry

Photoacoustics, 2022
A high-sensitivity all-optical photoacoustic spectroscopy based on fast swept laser interferometry is proposed to trace gas detection. The momentary cavity length of the fiber-optic Fabry–Perot microphone is demodulated by a fast swept-laser ...
Xuefeng Mao, Xiaoyan Ji, Yuting Tan, Hao Ye, Xiaofa Wang   +4 more
doaj   +1 more source

DMD-based software-configurable spatially-offset Raman spectroscopy for spectral depth-profiling of optically turbid samples [PDF]

, 2016
Spectral depth-profiling of optically turbid samples is of high interest to a broad range of applications. We present a method for measuring spatially-offset Raman spectroscopy (SORS) over a range of length scales by incorporating a digital micro-mirror ...
Gibson, Graham, Liao, Zhiyu, Notingher, Ioan, Padgett, Miles, Sinjab, Faris   +4 more
core   +2 more sources

Small-Size Resonant Photoacoustic Cell of Inclined Geometry for Gas Detection

, 2009
A photoacoustic cell intended for laser detection of trace gases is represented. The cell is adapted so as to enhance the gas-detection performance and, simultaneously, to reduce the cell size.
A. L. Ulasevich, A. Miklos, A. Olafsson, A. V. Gorelik, A.A. Kosterev, A.A. Kosterev, A.K.Y. Ngai, A.V. Gorelik, B.A. Paldus, D. Hofstetter, E. Huang, F. N. Nikonovich, F.G.C. Bijnen, F.J.M. Harren, F.R.E. Gruijl, J. Oomens, L.R. Narasimhan, M. P. Zakharich, M.B. Pushkarsky, M.M.J.W. Herpen van, N. S. Kazak, P. Kestler, R. Flindt, R. Lewicki, R.A. Rooth, R.F. Curl, S. Bernegger, S.L. Firebaugh, V. A. Firago, V. S. Starovoitov, V.P. Zharov, V.S. Starovoitov, V.S. Starovoitov, W. Urban, W.J. Witteman   +34 more
core   +1 more source

Calibration of a multi-pass photoacoustic spectrometer cell using light-absorbing aerosols [PDF]

Atmospheric Measurement Techniques, 2017
The multi-pass photoacoustic spectrometer (PAS) is an important tool for the direct measurement of light absorption by atmospheric aerosol. Accurate PAS measurements heavily rely on accurate calibration of their signal.
N. Bluvshtein, J. M. Flores, Q. He, E. Segre, L. Segev, N. Hong, A. Donohue, J. N. Hilfiker, Y. Rudich   +8 more
doaj   +1 more source

A measurement strategy for non-dispersive ultra-violet detection of formaldehyde in indoor air: Spectral analysis and interferent gases [PDF]

, 2015
We have conducted an extensive review of published spectra in order to identify a region with potential for detection of formaldehyde in indoor air.
Davenport, John, Hodgkinson, Jane, Saffell, John R., Tatam, Ralph P.   +3 more
core   +1 more source

Photo-acoustic dual-frequency comb spectroscopy

Nature Communications, 2020
Here, the authors show that the resolution and speed limitations in broadband photo-acoustic spectroscopy can be overcome by combining dual-comb spectroscopy with photo-acoustic detection.
Thibault Wildi, Thibault Voumard, Victor Brasch, Gürkan Yilmaz, Tobias Herr   +4 more
doaj   +1 more source

Thermal diffusivity measurement of undoped Yb2O3 oxide by self-made photoacoustic cell

Materials Letters: X, 2023
Photoacoustic spectroscopy is an essential technique for material characterization by measuring acoustic noise inside a cell. In this work, we have fabricated a photoacoustic cell and a pre-amplifier circuit and optimized both for maximum sensitivity ...
Minarul I. Sarkar, Kaushal Kumar
doaj   +1 more source

Comparison of the CRLC Models Describing the Helmholtz Type Cells for the Nondestructive Photoacoustic Spectroscopy

Metrology and Measurement Systems, 2014
The photoacoustic cell is the heart of the nondestructive photoacoustic method. This article presents a new simple lumped-components CRLC model of the Helmholtz type photoacoustic cell.
Bartłomiej Chrobak Łukasz, Andrzej Maliński Mirosław   +1 more
doaj   +1 more source

Study on the Photoacoustic Technology to Simultaneous In-Situ Detection of the Cavity Ring-Down Spectrum for Multi-Optical Parameters

IEEE Photonics Journal, 2020
A simultaneous in-situ detection technique to obtain multi-optical parameters was proposed. The same 403.56 nm, low power, blue diode laser was used to conduct the cavity ring-down spectroscopy and photoacoustic spectroscopy, which were coupled.
Hua-Wei Jin, Ren-Zhi Hu, Pin-Hua Xie, Chong-Chong Huang, Feng-Yang Wang, Chuan Lin   +5 more
doaj   +1 more source

Quartz-Enhanced Photoacoustic and Photothermal Spectroscopy

Applied Sciences, 2022
The development of innovative gas-sensing systems is fundamental in diverse research fields such as physics, chemistry, biology, medicine and environmental science [...]
Hongpeng Wu, Angelo Sampaolo
doaj   +1 more source