摘要
介绍了以汞包层光波导为传感探头的光纤液位传感器的原理及信号处理,其工作原理是利用连通器将液位的变化转变为汞包层光波导包层长度的变化。理论分析和实验表明,当光波导直径和光波长一定时,光功率衰减随汞包层光波导长度增加作线性增加。通过对汞包层光波导引起光功率衰减的检测,探头结构的优化设计以及探测器件的选型,可以获得实时性很强的高精度液位测量。实验测得10 m液位的最大测量误差为5.2 mm,理论分析的相对测量精度可达0.02%。该液位传感器的研制对于油库等易燃、易爆环境中的液位测量具有重要意义。
Both of the theoretical analysis and experiments show that when the diameter of the waveguide and the light wavelength are fixed, the optical power loss increases linearly with the increase of the Hg cladding optical waveguide （HCOW） length. The theory and signal processing of the optical liquid level sensor with HCOW as its probe are analyzed, it works based on the theory of connected vessel, which converts the change of liquid level to the change of the length of the HCOW. By optimized design, the real time detection of the liquid level with high precision can be got. The experimental results show that the measurement accuracy is 5.2 mm within 10 m liquid level, its theory precision can up to 0.02%. The research of this liquid level senor may offer significant metrological improvement by reason of its safety in corrosive or explosive environments, especially in the liquid level detection of oil depot.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2005年第11期1461-1466,共6页
Acta Optica Sinica
基金
国家自然科学基金(60337010)
国家863计划(2004AA31G200)
北京市自然科学基金(4052023)
霍英东基金(91062)
北京交通大学攀登基金(PD283)资助课题
关键词
光纤传感器
汞包层光波导
光功率衰减
液位测量
optical fiber sensor
Hg cladding optical waveguide
optical power loss
liquid level measurement
