干涉条纹计数法光纤Fabry-Perot腔液位传感器

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 Using Interference Fringe Counting Technique

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.