干涉条纹计数法光纤Fabry-Perot腔液位传感器

An Optical Fiber Fabry-Perot Cavity Liquid Level Sensor Using Interference Fringe Counting Technique

提出一种抗光源波动和外界干扰的条纹计数法光纤Fabry-Perot腔干涉型液位传感器.为适应这种条纹计数法对应变大挠度的要求,采用波纹管作应力弹性元件;对干涉条纹走向(或液位升降判向),分别提出实用的硬件设计方案和计算机软件处理办法;给出一种腔长温度补偿设计;实际制作了双光路光纤Fabry-Perot腔液位传感器,进行了实际气压模拟试验和实际水位测量试验,取得了良好结果.

An optical fiber Fabry-Perot cavity liquid level sensor with anti light source fluctuations and disturbances using interference fringe counting technique is developed. Flexible metal bellows, which can afford a large strain displacement, is suggested to be one surface of the F-P cavity. Both the hardware electronics design scheme and the software treatment methods are developed to count the fringes and determine the up or down of the liquid level. A design for compensating the temperature affection is suggested. The liquid level sensor is fabricated; the practical measurements is carried out both for the air pressure and the water level.