Dong Zhenyong, Zhang Guanbin, Jin Yaqi, Zhou Jie, Guan Junneng, Tong Zijin, Wei Zhongchao, Tan Chunhua, Wang Faqiang, Meng Hongyun
Opt Express. 2022 Jan 17;30(2):1152-1166. doi: 10.1364/OE.442377.
We have manufactured an intensity modulated optical fiber SMDMS sensor with hydroxyethyl cellulose (HEC) hydrogel coating for simultaneous measurement of RH and temperature. The SMDMS sensor was manufactured by splicing single-mode fiber (SMF), multi-mode fiber (MMF), dispersion compensation fiber (DCF), MMF, and SMF in sequence to form a structure of SMF + MMF + DCF + MMF + SMF (SMDMS). The cladding of MMFs and DCF were corroded by hydrofluoric acid (HF) and coated with HEC hydrogel to excite a strong evanescent field and increase the sensitivity of the SMDMS sensor. The adsorption of water molecules by HEC will cause a change in the effective refractive index of cladding mode, which will eventually change the intensity of the transmission spectrum. The experimental results indicate that the sensitivities are 0.507 dB/%RH and 0.345 dB/°C in the RH range of 30%-80% and temperature range of 10°C-50°C, respectively. At last, a dual-parameter measurement matrix is constructed based on the experimental results to achieve the simultaneous measurement of RH and temperature. The SMDMS sensor has the advantages of high sensitivity and good robustness, and has potential application prospects in daily life and other fields.
我们制造了一种带有羟乙基纤维素（HEC）水凝胶涂层的强度调制型光纤SMDMS传感器，用于同时测量相对湿度（RH）和温度。该SMDMS传感器是通过依次熔接单模光纤（SMF）、多模光纤（MMF）、色散补偿光纤（DCF）、MMF和SMF来制造的，以形成SMF + MMF + DCF + MMF + SMF（SMDMS）的结构。MMF和DCF的包层用氢氟酸（HF）腐蚀，并用HEC水凝胶涂层以激发强倏逝场并提高SMDMS传感器的灵敏度。HEC对水分子的吸附会导致包层模有效折射率的变化，最终改变传输光谱的强度。实验结果表明，在30% - 80%的RH范围和10°C - 50°C的温度范围内，灵敏度分别为0.507 dB/%RH和0.345 dB/°C。最后，基于实验结果构建了双参数测量矩阵，以实现RH和温度的同时测量。该SMDMS传感器具有高灵敏度和良好鲁棒性的优点，在日常生活等领域具有潜在的应用前景。
