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Passive, temperature compensated techniques for tunable filter calibration in bragg-grating interrogation systems
Passive, temperature compensated techniques for tunable filter calibration in bragg-grating interrogation systems
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机译:无源温度补偿技术,用于布拉格光栅询问系统中的可调滤波器校准
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摘要
A passive, temperature compensated tunable filter calibration device in a Bragg-grating interrogation system. The invention comprises two systems: 1) a dual substrate Bragg grating calibration system, the temperature of an array of gratings is estimated using an array of gratings bonded to a common host substrate and a single grating bonded to a material with a different coefficient of thermal expansion; 2) a hydrogen cyanide wavelength reference absorption cell that absorbs light at discrete wavelengths corresponding to the molecular vibration mode frequencies of the gas. A first photodetector sees the transmission spectrum and a second sees the reflections from Bragg gratings in a sensing array. In this system there is no temperature compensation step as the absorption lines are not sensitive to temperature.
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