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检索条件"主题词=optical micro sensors"

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Hydrogen loaded fiber Bragg grating for high temperature sensor applications

Hydrogen loaded fiber Bragg grating for high temperature sen...

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International Conference on Applications of Photonics Technology

作者： Zhang, BW Kahrizi, M Concordia Univ Dept Elect & Comp Engn Montreal PQ H3G 1M8 Canada

ISBN: (纸本)0819455288

Bragg gratings have widespread applications in the rapidly growing field of optical sensors. Although fiber Bragg gratings are often referring to permanent refractive index structures, exposure in increased temperature usually results the decay of the refractive index modulation. Basically, the stability of the grating competence at high temperature is an important criterion for high temperature sensor applications. This report is a part on going research to develop high temperature optical sensors. We report our design and analyze of a hydrogen loaded fiber Bragg grating temperature sensor range from room temperature to around 1000degreesC. A basic setup has been built in our lab to examine the performance of the point temperature sensor based on the hydrogen loaded fiber Bragg grating. Until now, a grating has been shown to stabilize at temperatures in excess of 700degreesC and to survive at temperatures in excess of 930degreesC. The tested operation gratings around 700degreesC retain up to 80% reflectivity after one and a half hours. The thermal treatment of the tested hydrogen loaded fiber Bragg gratings is demonstrated capable to enhance effectively the grating's thermal stability. Our experimental results provide a better understanding of thermal response to the hydrogen loaded fiber Bragg gratings and their decay behavior at elevated temperatures.

关键词： optical micro sensors temperature sensors fiber Bragg grating thermal decay

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Wide range periodic waveguide temperature sensor

Wide range periodic waveguide temperature sensor

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15th IEEE Canadian Conference on Electrical and Computer Engineering

作者： Zhang, BW Kahrizi, M Concordia Univ Dept Elect & Comp Engn Montreal PQ H3G 1M8 Canada

ISBN: (纸本)0780377818

In this paper, we design and analyze a periodic dielectric Bragg grating waveguide temperature sensor ranging from room temperature to over 1200degreesC By using this sensor combined with a wavelength shifting detector and radiation detection schemes, a wide range thermometer can be built. Temperature can be measured in two ways using our thermal sensor. One way is to defect the wavelength shifting by an optical spectrum analyzer (OSA). The wavelength shifting could be converted to the change of environment temperature. This method is appropriate for the temperature range from 20degreesC to 600degreesC Another way is to detect the power of the probe radiation for the temperature range of over 600degreesC to the melting point of the probes. This sensor has many applications including in aerospace structures..

关键词： MEMS wave-guides optical micro sensors temperature sensors integrated Bragg grating

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High-temperature Bragg grating waveguide sensor

High-temperature Bragg grating waveguide sensor

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International Conference on MEMS, NANO and Smart Systems

作者： Zhang, BW Kahrizi, M Concordia Univ Dept Elect & Comp Engn Montreal PQ H3G 1M8 Canada

ISBN: (纸本)0769519474

Design and analyses of a periodic dielectric Bragg grating waveguide temperatures reported in this work. The sensor is capable to measure temperatures ranging from room temperature to over 1200degreesC By using this sensor combined with a wavelength shifting detector and radiation detection schemes, a wide range thermometer can be built. Temperature can be measured in two steps using our thermal sensor. First step is to detect the wavelength shifting by an optical spectrum analyzer (OSA). The wavelength shifting could be converted to the change of environment temperature. This method is appropriate for the temperatures ranging from 20degreesC to 600degreesC. Another step is to detect the power of the probe radiation for the temperature range of over 600degreesC to the melting point of the probes. This sensor has potential applications in many areas particularly in aerospace industries..

关键词： MEMS wave-guides optical micro sensors temperature sensors integrated Bragg grating

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