摘要A new absorbance sensor based on long-period fiber gratings (LPFGs) is presented, The measurand is coated on the cladding of the LPFG. It is found that the depth of the stop band of the LPFG spectrum will be strongly affected by the absorbance of the measurand if an optimum coating thickness is selected. The analysis shows that within the optimal thickness range, the cladding modes could transform into the overlay modes and interact with the measurand more effectively. An absorbance sensitivity of 7×103 is available when the sensor structure is optimized.
Abstract：A new absorbance sensor based on long-period fiber gratings (LPFGs) is presented, The measurand is coated on the cladding of the LPFG. It is found that the depth of the stop band of the LPFG spectrum will be strongly affected by the absorbance of the measurand if an optimum coating thickness is selected. The analysis shows that within the optimal thickness range, the cladding modes could transform into the overlay modes and interact with the measurand more effectively. An absorbance sensitivity of 7×103 is available when the sensor structure is optimized.
LUO Tao;GU Zheng-Tian**
. A New Type of Absorbance Sensors Based on Long-Period Fiber Gratings[J]. 中国物理快报, 2011, 28(5): 54207-054207.
LUO Tao, GU Zheng-Tian**
. A New Type of Absorbance Sensors Based on Long-Period Fiber Gratings. Chin. Phys. Lett., 2011, 28(5): 54207-054207.
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