FBG-FP级联式无交叉敏感双参量光纤探针  

FBG-FP cascaded dual-parameter fiber optic probe without cross-sensitivity

作　　者：王清明 张雯[1,2] 文科 韩静 祝连庆[1,2] Wang Qingming;Zhang Wen;Wen Ke;Han Jing;Zhu Lianqing(Beijing Laboratory of Optical Fiber Sensing and System,Beijing Information Science&Technology University,Beijing 100192,China;Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument,Beijing Information Science&Technology University,Beijing 100016,China;Beijing Spacecrafts,China Academy of Space Technology,Beijing 100094,China;Beijing Tiantan Hospital,Capital Medical University,Beijing 100070,China)

机构地区：[1]北京信息科技大学光纤传感与系统北京实验室,北京100192 [2]北京信息科技大学光电测试技术及仪器教育部重点实验室,北京100016 [3]中国空间技术研究院北京卫星制造厂有限公司,北京100094 [4]首都医科大学附属北京天坛医院,北京100070

出　　处：《仪器仪表学报》2025年第2期355-365,共11页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金(52275517);北京市自然科学基金(3232018);市属高校教师队伍建设支持计划优秀青年人才(BPHR202203226);高等学校学科创新引智计划(D17021)项目资助。

摘　　要：为提高传感器集成度并适应设备微型化趋势,提出并制备了一种面向生物体液监测领域的光纤布拉格光栅-法布里珀罗(FBG-FP)级联结构紧凑型光纤探针,用于检测折射率和温度。通过构建级联结构反射率分布模型,优化了器件级联顺序。采用精密切割熔接技术制备单模光纤-空芯光纤-单模光纤(SMF-HCF-SMF)结构的FP探针,并利用飞秒激光直写技术在距熔接界面100μm处刻写FBG,实现了级联式紧凑型双传感元件的集成,基于FBG结构与FP结构对温度和折射率的波长/强度响应特性,从原理上有效解决了交叉敏感问题。搭建温度折射率实验系统,在25℃~55℃水浴温度、1.3330~1.3816折射率范围内,对4根光纤探针的传感特性进行分析。实验结果表明,温度循环过程中,FBG与FP中心波长均随升温红移、降温蓝移,平均温度灵敏度分别为9.36、8.52 pm/℃;待测环境折射率增大时,FBG波长与强度无变化,FP干涉波长不变、谐振强度逐渐减小,且强度拟合结果呈抛物线趋势。以折射率1.3546为界进行分段线性拟合,可得1.3330~1.3546折射率区间内FP灵敏度均值为5.86 dBm/RIU、最大值为10.72 dBm/RIU,在1.3546~1.3618折射率区间内FP灵敏度均值为1.40 dBm/RIU、最大值为2.74 dBm/RIU。该传感器制作简单、结构紧凑、灵敏度高,在生物体液监测领域具有良好的应用前景。To enhance sensor integration and align with the trend of device miniaturization,a compact fiber optic probe based on a fiber Bragg grating-Fabry-Perot(FBG-FP)cascaded structure is proposed and fabricated for monitoring refractive index and temperature in biological fluids.By constructing a cascaded structure reflectivity distribution model,the device cascade sequence is optimized.The fiber FP probe with a single-mode fiber-hollow-core fiber-single-mode fiber structure is prepared using precise cutting and splicing techniques.A FBG is inscribed 100μm from the splicing interface using femtosecond laser direct writing,achieving a cascaded compact dual-sensing element fiber optic probe.The wavelength/intensity response characteristics of the FBG and FP structures to temperature and refractive index effectively resolved the cross-sensitivity issue in principle.A temperature and refractive index experimental system is set up to analyze the sensing characteristics of four fiber optic probes within a temperature range of 25℃to 55℃and a refractive index range of 1.3330 to 1.3816.Experimental results show that,during temperature cycling,the FBG and FP central wavelengths redshifted with increasing temperature and blueshifted with decreasing temperature,with average temperature sensitivities of 9.36 and 8.52 pm/℃,respectively.As the ambient refractive index increased,the FBG wavelength and intensity are unchanged,while the FP interference wavelength stays constant and the resonance intensity gradually decreases,with the intensity fitting results showing a parabolic trend.Segmented linear fitting with a refractive index of 1.3546 as the boundary reveals that within the refractive index range of 1.3330 to 1.3546,the FP sensitivity averaged 5.86 dBm/RIU with a maximum of 10.72 dBm/RIU,and within the range of 1.3546 to 1.3618,the FP sensitivity averaged 1.40 dBm/RIU with a maximum of 2.74 dBm/RIU.This sensor,characterized by its simple fabrication,compact structure,and high sensitivity,shows promising application prospe

关 键 词：光纤探针 无交叉敏感 双参数测量 生物体液监测 

分 类 号：TN253[电子电信—物理电子学] TH74[机械工程—光学工程]