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Drift-eliminating method of intensity demodulation on a chirped fiber grating strain sensor

机译：fiber光纤光栅应变传感器的强度解调漂移消除方法

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摘要

It is quite possible to detect the strain of a sample based on a chirped fiber grating (CFG) sensor, which has a wider bandwidth of light signal than a fiber Bragg grating. Usually, environmental factors play negative roles in the process of intensity demodulation. A drift-eliminating method of CFG intensity demodulation has been created and tested in our lab. Three CFG sensors were involved in this research. Two of them with close wavelength bands connected in series were used as a strain sensing unit; the third one was used as a referencing grating working within the reflective wavelength spectrum of the other two. It is shown that the signal ratio of the sensing unit and the referencing grating is a linear function of the loading strain. The linearity is as high as 99.79%.
机译：基于a光纤光栅（CFG）传感器检测样品的应变是完全有可能的，CF光纤光栅的光信号带宽比布拉格光纤光栅的宽带。通常，环境因素在强度解调过程中起负面作用。 CFG强度解调的消除漂移的方法已经在我们的实验室中创建和测试。三个CFG传感器参与了这项研究。它们中的两个具有接近的波长带串联连接用作应变传感单元。第三个用作参考光栅，在其他两个反射波长光谱内工作。结果表明，传感单元与参考光栅的信号比是负载应变的线性函数。线性高达99.79％。

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