摘要
利用长周期光纤光栅(LPFG)的基模和包层模间的耦合特性,设计制作了一种基于LPFG的液位传感器。LPFG包层模对环境折射率的响应不同,随着液位的变化,其透射功率发生变化。用该传感器对蒸馏水和乙醇的液位变化进行测量,当液位在0.0～17.5mm范围内变化时,LPFG透射功率分别变化了6.8719dB和13.4360dB,其灵敏度为0.389 6dB/mm和0.7678dB/mm。结果表明,液体的折射率越大,传感器的灵敏度越高,并且具有良好的线性关系。
A kind of liquid-level sensor is presented using the long-period fiber grating（LPFG）.It is based on the coupling between the LPFG′s fundamental mode and cladding mode,which is affected by the refractive index of the medium around the LPFG.The liquid-level changes of distilled water and ethanol are measured using this sensor.When the liquid-level are changes between 0 mmand 17.5 mm,the transmission power of LPFG changes accordingly.The changes are up to 6.871 9 dB and 13.4360 dB,and the sensitivities are 0.3896 dB/mm and 0.7678 dB/mm respectively.The results show that the sensor has higher sensitivity in the liquid with larger refractive index than that in the lower refractive index liquid,and it has good linearity.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2010年第12期1777-1779,共3页
Journal of Optoelectronics·Laser
基金
天津市自然科学基金资助项目(08JCYBJC14400)
天津市教委基金资助项目(20060609)
关键词
长周期光纤光栅(LPFG)
光纤传感器
液位
透射谱
long-period fiber grating（LPFG）
fiber-optic sensor
liquid level
transmission spectrum
