Journal ArticleDOI
A novel fiber Fabry–Perot filter based mixed-gas sensing system
TLDR
In this paper, a mixed-gas sensing system utilizing a fiber Fabry-Perot (FFP) filter and fiber Bragg Gratings (FBG) was developed by modulating the transmission wavelength of FFP within the width of one absorption line of the target gas.Abstract:
A practical mixed-gas sensing system utilizing a fiber Fabry–Perot (FFP) filter and Fiber Bragg Gratings (FBG) was developed. By modulating the transmission wavelength of FFP within the width of one absorption line of the target gas, the system can detect different kinds of gaseous species selectively. A FBG with center wavelength being aligned to the absorption peak of the target gas was employed as wavelength reference to make the transmission wavelength of FFP modulate stably in a required region. The properties of the proposed system were demonstrated experimentally by simultaneous detection of acetylene (C 2 H 2 ) and carbon monoxide (CO). Approximate linear relationships between the system responses and the input gas concentrations were demonstrated by experiments. The minimum detectable C 2 H 2 and CO concentration of ∼15 ppm and ∼300 ppm were also achieved by experiments respectively.read more
Citations
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Journal ArticleDOI
Multi-component gas sensing based on slotted photonic crystal waveguide with liquid infiltration
Ya-nan Zhang,Yong Zhao,Qi Wang +2 more
TL;DR: In this article, a high sensitive multi-component gas sensing system was proposed, in which the slotted photonic crystal waveguide (SPCW) was used as the gas cell and the fiber Fabry-Perot (FFP) was adopted as the wavelength filter by choosing the refractive index that infiltrated in the first and second rows of air holes adjacent to the slot respectively.
Journal ArticleDOI
Theoretical research on high sensitivity gas sensor due to slow light in slotted photonic crystal waveguide
TL;DR: In this article, a miniature and sensitivity gas sensor based on slotted photonic crystal waveguide (SPCW) was presented, in which the correlation spectroscopy method was applied for signal processing and the SPCW was used for the gas cell.
Journal ArticleDOI
Optimizing the slow light properties of slotted photonic crystal waveguide and its application in a high-sensitivity gas sensing system
Ya-nan Zhang,Yong Zhao,Qi Wang +2 more
TL;DR: In this article, a slotted photonic crystal waveguide (SPCW) was introduced as the gas cell, and its structure was properly optimized to obtain slow light with large bandwidth and high group index.
Journal ArticleDOI
Monitoring of CO2 and CH4 composition in a biogas matrix from different biomass structures
TL;DR: In this article, a superluminescent diode (SLED) was used to detect CO2 and CH4 in biogas from different feed-stocks using a low-resolution spectrometer.
Journal ArticleDOI
An all-fiber gas sensing system using hollow-core photonic bandgap fiber as gas cell
TL;DR: An all-fiber compact gas sensing system using a hollow-core photonic bandgap fiber (HC-PBF) as a gas cell is proposed in this article, which has relatively lower transmission loss and much simpler construction.
References
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Journal ArticleDOI
Long Optical Paths of Large Aperture
TL;DR: In this article, an absorption cell is described, in which the light traverses a small volume a large and arbitrarily variable number of times, and the angular aperture of the mirrors is not occulted either on or off the optical axis, and can be used for observing spectra that are very weak, or that belong to high boiling point compounds or to compounds obtainable only in very low concentrations.
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Off-Axis Paths in Spherical Mirror Interferometers
TL;DR: When a spherical mirror interferometer is illuminated by an off-axis ray of light, the repeated reflections cause the ray to trace a path which lies on the surface of a hyperboloid, with the points of reflection on the mirrors on ellipses as mentioned in this paper.
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Near- and mid-infrared laser monitoring of industrial processes, environment and security applications
TL;DR: In this article, the advantages of infrared laser monitoring in terms of sensitivity, selectivity and the ability of nonintrusive detection of gases are reviewed, where emphasis is laid on direct absorption spectroscopy and evanescent field spectrograms.
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A portable remote methane sensor using a tunable diode laser
TL;DR: In this paper, a portable remote methane sensor using a 1.65 µm InGaAsP distributedfeedback laser is developed, which is designed as a man-portable long-path absorption lidar using a topographical target.
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Wavelength modulation photoacoustic spectroscopy: Theoretical description and experimental results
Stéphane Schilt,Luc Thévenaz +1 more
TL;DR: In this paper, a theoretical description of photo-acoustic spectroscopy generated by wavelength modulation of a semiconductor laser source is reported for a Lorentzian absorption line, which describes the first and second-harmonic photoacoustic signals produced by a current-modulated semiconductor lens.