Autor: He, S. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Quartz enhanced photoacoustic spectroscopy based on an external cavity quantum cascade laser
Autorzy:: Xu, L.
Zhou, S.
He, T.
Li, J.
Powiązania:: https://bibliotekanauki.pl/articles/173669.pdf
Data publikacji:: 2018
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: external cavity quantum cascade laser
ECQCL
quartz enhanced photoacoustic spectroscopy
QEPAS
volatile organic compound
VOC
ethanol
Opis:: Mid-infrared laser spectroscopy is a powerful analytical tool for trace gases detection. In this study, a spectroscopic system based on an external cavity quantum cascade laser (ECQCL) and quartz enhanced photoacoustic spectroscopy (QEPAS) was developed for volatile organic compounds (VOCs) measurements. Primary laboratory test on ethanol spectroscopy was investigated and compared with traditional direct absorption spectroscopy (DAS). Experimental results show that the proposed QEPAS is more sensitive than the conventional DAS method. In addition, the significant linear dependence of photoacoustic signal on sample pressures and laser operating parameters was observed.
Źródło:: Optica Applicata; 2018, 48, 4; 687-695
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Depth-resolved measurement of the compression displacement fields on the front and rear surfaces of an epoxy sample
Autorzy:: Zhang, W.
Dong, B.
He, Z.
Xie, S.
Zhou, Y.
Powiązania:: https://bibliotekanauki.pl/articles/174399.pdf
Data publikacji:: 2018
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: depth-resolved measurement
compression displacement field
wavenumber-scanning interferometry
epoxy
Opis:: Compression is one of the typical parameters measured in material mechanics. In this research, the compression displacement fields on the front and rear surfaces of an epoxy sample are measured by using a tilt depth-resolved wavenumber-scanning Michelson interferometer. The light source is a distributed feedback laser diode, the wavenumber of which can be modulated to about 1.017 × 10⁴ m^–1 by the temperature without mode hopping. A random-sampling Fourier transform is designed to evaluate the phase differences before and after the applied loads. Experimental results show that the depth-resolved measurement of the compression displacement field is of high accuracy. It can be used to analyze force propagation inside resin-based composites.
Źródło:: Optica Applicata; 2018, 48, 2; 311-323
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Fiber-optic accelerometer based on a modal interferometer using a thin-core fiber
Autorzy:: Wang, X
Wu, X
Li, S
Ge, Q
He, T
Yu, B
Powiązania:: https://bibliotekanauki.pl/articles/174927.pdf
Data publikacji:: 2015
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: fiber-optic accelerometer
modal interferometer
thin-core fiber
Opis:: A compact fiber-optic accelerometer based on a modal interferometer, which is fabricated by misaligned splicing of a short section of a thin-core fiber between two sections of a standard single-mode fiber, is demonstrated experimentally. A spectrum analysis method is used to detect an acceleration signal rapidly. The experimental results show that the thin-core fiber-based fiber-optic accelerometer has a minimum detectable acceleration of 3.3×10–3g (g – gravitational acceleration), and a wide frequency response range from 10 to 1200 Hz. Moreover, the proposed accelerometer exhibits the advantages of low cost, simple structure and easy fabrication.
Źródło:: Optica Applicata; 2015, 45, 3; 317-325
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

Artykuł

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