Research On Liquid Level Measurement Based On Optical Fiber Sensor

The liquid level measurement is very common in the industry. There are many optical fiber sensor system examples that applied to liquid level measurement recently, with the continuous high-tech development such as computers, fiber, sensors. Traditional optical fiber liquid level measurement has a number of ways, such as simple shading type optical fiber sensing system, optical fiber pressure sensing system, and reflective fiber-optic sensing system. In the new optical devices, optical fiber grating has unique advantages which attract peoples' attention. Also the fiber sensor based on fiber grating has advantage in liquid level measurement.In this paper, using Fiber Bragg Grating sensor designed FBG sensor liquid level system, from the experimental point of view based on FBG sensing liquid level measurement technology to do a demonstration. Then According to the reflective optical fiber sensor to design the liquid level measurement system more suitable for industrial applications which is based on the intensity modulation, we discuss how to build the optical fiber sensing system and signal processing system from the principle of reflective optical fiber sensor, and analyze the error in the process of measuring, give the way to improve the accuracy of the measurement system.Main contents:1. To compare the traditional method of optical fiber liquid level, in particular, focused on possibilities that the fiber grating used as a liquid level measurement and its enhancement and package in practical application.2. Make the reflective optical fiber sensor as the sensing element to measure the liquid level, investigate the hardware architecture of the system such as key device choice and photoelectric conversion circuit design etc. as well as the potential error analysis in the process of measuring.3. To Analysis two different sensitive optical components in the liquid level measurement system from the point of the experiment and on the practical application, give further prospect on liquid level optical fiber sensing technology.