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基于所研制的侧漏型光子晶体光纤,提出并研制出一种Sagnac干涉仪型高灵敏度宽线性测量范围的弯曲传感器.实验研究结果表明,当侧漏型光子晶体光纤中的线性缺陷与弯曲方向一致时,采用群双折射和波谷波长偏移量测量弯曲曲率均可获得高的弯曲灵敏度,但线性测量范围小,且不能进行小弯曲曲率的测量.当线性缺陷与弯曲方向垂直时,以波谷波长偏移量进行弯曲曲率检测,可获得10.798 nm/m-1高灵敏度的同时且可实现0—5.03 m-1的宽线性测量范围,结合测量矩阵的引入可实现温度和弯曲曲率的同时测量,进而剔除环境温度变化对弯曲曲率检测的干扰,实现了高灵敏度宽线性范围的弯曲传感;而以群双折射进行弯曲曲率检测,虽然检测灵敏度较低,但可实现对环境温度不敏感的弯曲传感.
A novel Sagnac interferometer with high sensitivity and wide linear measuring range is proposed and developed based on the developed side-drain photonic crystal fiber.The experimental results show that when the linear defects in the side-drain photonic crystal fiber and the bending direction When the same is true, high bending sensitivity can be obtained by measuring the curvature of curvature with group birefringence and wave-wavelength shift, but the linear measurement range is small and the measurement of curvature of small curvature can not be performed. When the linear defect is perpendicular to the bending direction, Wavelength Offset For curvature detection, a wide linear range of 0-5.03 m-1 can be achieved with high sensitivity of 10.798 nm / m-1 and simultaneous measurement of temperature and curvature with the introduction of a measurement matrix , And then remove the environmental temperature changes on the curvature of the detection of interference, to achieve a wide range of high sensitivity and sensitivity of the bending; and group birefringence for bending curvature detection, although the detection sensitivity is low, but can be achieved insensitive to the ambient temperature Bend sensor.