Pan Zhenrong, Feng Jianxun, Hu Xiduo, Jia Chuanyu, Huang Xuguang
Opt Express. 2019 Oct 28;27(22):32621-32629. doi: 10.1364/OE.27.032621.
We propose a novel fiber chemical sensing system based on reflective Mach-Zehnder interference with temperature calibration for the measurement of Cd in aqueous solution. The sensing system has high measurement sensitivity of Cd with an estimated minimum detection limit of 4×10 mol/L at a spectral resolution of 0.02 nm and with long-term stability. The fiber sensing head is prepared by coating a sensing membrane on a fused tapering single-mode fiber. The thiourea group of the sensing membrane has an effective combination effect on Cd. Disturbance from ambient temperature fluctuation on the measurement of Cd concentration can be eliminated with the fiber Bragg grating.
我们提出了一种基于反射式马赫-曾德尔干涉并带有温度校准功能的新型光纤化学传感系统，用于测量水溶液中的镉。该传感系统对镉具有高测量灵敏度，在光谱分辨率为0.02 nm时，估计最低检测限为4×10⁻⁹ mol/L，并且具有长期稳定性。光纤传感头是通过在熔锥单模光纤上涂覆传感膜制备而成。传感膜中的硫脲基团对镉具有有效的结合作用。利用光纤布拉格光栅可以消除环境温度波动对镉浓度测量的干扰。
