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报导了一种基于级联保偏光纤(PMF)和长周期光纤光栅(LPFG)的Sagnac环温度和环境折射率双参量传感器。在Sagnac干涉环内级联PMF和LPFG,LPFG的双折射效应使得Sagnac干涉的相位差受环境折射率调制。所提出的双参量传感器的透射光谱中,由LPFG形成的透射峰和Sagnac干涉形成的干涉峰对温度和环境折射率各自具有不同的灵敏度,通过对两者特征峰波长漂移量的测量就可实现对温度和环境折射率的同时传感。实验上搭建了温度和环境折射率双参量测试装置,采用波长解调方法,受光源功率波动的影响小,温度灵敏度为1.2nm/℃;环境折射率灵敏度为15nm/RIU。该双参量传感方案解决了温度和环境折射率的交叉敏感问题,结构简单,采用金属板凹槽结构进行封装有效地保护了LPFG,在生物传感和化学传感等领域具有广阔的应用前景。
A Sagnac ring temperature and ambient refractive index dual-parameter sensor based on cascaded PMF and LPFG is reported. The birefringence effect of the LPFG in cascaded PMFs and LPFGs within a Sagnac interference ring allows the phase difference of Sagnac interference to be modulated by the ambient refractive index. In the proposed transmission spectrum of two-parameter sensor, the transmission peak formed by LPFG and the interference peak formed by the Sagnac interference have different sensitivities respectively to the temperature and the refractive index of the environment, and the wavelength drift of the characteristic peak can be measured Simultaneous sensing of temperature and ambient refractive index. Experimental set up the temperature and the environment refractive index two-parameter test device, the use of wavelength demodulation method, by the light source power fluctuations, the temperature sensitivity of 1.2nm / ℃; environmental refractive index sensitivity of 15nm / RIU. The two-parameter sensing scheme solves the problem of cross-sensitivity of temperature and the refractive index of the environment. The structure is simple. The encapsulation using the grooved metal plate structure effectively protects the LPFG and has broad application prospects in the fields of biosensing and chemical sensing .