摘要
为了测量白酒蒸馏过程中的温度和酒精溶度,制作了一种基于马赫曾德仪(MZI)与光纤布拉格光栅(FBG)级联的可同时测量温度和酒精溶液浓度的光纤传感器。FBG是利用飞秒激光逐线刻写的方式在单模光纤(SMF)中制作的周期为2.2μm,布拉格波长为1 591.21 nm,透射谱深度可达23 d B的4阶光纤布拉格光栅;MZI是将细芯光纤和SMF采用纤芯错位和锥腰扩大熔接技术制作的腔长为8.7 mm,对比度为28.5 d B的透射式光纤干涉传感器。基于多光束干涉理论对传感器的温度和酒精溶液浓度传感特性进行分析,利用MZI干涉波谷与FBG透射峰的灵敏度差异,结合灵敏度系数矩阵实现对温度和酒精溶液浓度的同时测量。实验中,传感器的酒精溶液浓度和温度灵敏度分别可达-41.37 pm/%和58.96 pm/℃。该传感结构在白酒酿造产业有潜在的应用前景。
To detect the temperature and alcohol concentration during the liquor distillation, a dual-parameter optical sensor based on Mach-Zehnder intefferometer （MZI） and fiber Bragg grating （FBG） cascade structure is fabricated. The sensor is formed by a 4-order FBG which is fabricated by the femtosecond laser with line-by-line method in single mode fiber （SMF）. The transmitted MZI is based on core-offset and large overlap splicing method between thin core fiber and SMF. The period of the proposed FBG is 2.2 μm. The Bragg wavelength is 1 591.21 nm. The depth of the transmission spectrum is 23 dB. For MZI, the length of thin core fiber is 8.7 mm and the interference contrast fringe is 28.5 dB. The temperature and alcohol solution concentration features of the sensor are analyzed by beam interference theory. FBG and MZI have different sensitivities to temperature and alcohol solution concentration. The sensitivity matrix is constructed and the temperature and alcohol solution concentration can be measured simultaneously. In the experiments, the sensitivities of concentration of alcohol solution and temperature can reach up to - 41.37 pro/% and 58.96 pro/℃. Therefore, the proposed sensing structure has the potential application prospect in the liquor manufacturing industry.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2017年第12期3020-3027,共8页
Chinese Journal of Scientific Instrument
基金
教育部"长江学者和创新团队"发展计划(IRT_16R07)
北京市教委2015年度创新能力提升计划(TJSHG201510772016)
北京市优秀人才培养(2016000020124G070)项目资助
关键词
光纤传感器
飞秒激光
光纤布拉格光栅
马赫曾德干涉仪
酒精溶液浓度
fiber optics sensors
femtosecond laser
fiber Bragg grating
Mach-Zehnder interferometer
concentration of alcohol solution
