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Multi-spectral features sensing techniques and sensors comprising plural gratings with plural chirp slopes
Multi-spectral features sensing techniques and sensors comprising plural gratings with plural chirp slopes
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机译:多光谱特征感测技术和传感器,包括具有多个啁啾斜率的多个光栅
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摘要
Various embodiments of sensors are described that exhibit several spectral features that together offer coverage of a wavelength range corresponding to the desired strain dynamic range (or temperature range) of a system. The spectral features arise from a Fabry-Perot interferometer formed by two overlapping chirped FBGs, the free-spectral range (FSR) of which varies with wavelength. The spectral features may be differentiated due to a combination of spacing and slope of the overlapped, chirped gratings.
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