Abstract
We propose a novel technique for optical liquid level sensing. The technique takes advantage of an optical spectrum spreading technique and directly measures liquid level with a digital format. The performance of the sensor does not suffer from changes of environmental variables and system variables. Due to its distinct measurement principle both high resolution and a large measurement range can be achieved simultaneously.
Highlights
There has been consistent interest in executing continuous liquid-level measurements in numerous areas, such as the fuel, oil, and water tanks of aircraft, rockets, and automobiles
The performances of the techniques based on the measurements of strain, pressure and weight are greatly affected by environmental variables such as temperature, pressure, gravity, density, absorption and refractive index, by system variables such as source intensity, attenuation
High resolution monitoring of liquid level was reported using light reflected from the liquid surface to perform an optical radar measurement of the liquid surface proximity [5]
Summary
There has been consistent interest in executing continuous liquid-level measurements in numerous areas, such as the fuel, oil, and water tanks of aircraft, rockets, and automobiles. Electrical sensors are inappropriate because of the hazards posed by sparks in potentially explosive environments. Sensors based on purely optical techniques have been described The performances of the techniques based on the measurements of strain, pressure and weight are greatly affected by environmental variables such as temperature, pressure, gravity, density, absorption and refractive index, by system variables such as source intensity, attenuation. High resolution monitoring of liquid level was reported using light reflected from the liquid surface to perform an optical radar measurement of the liquid surface proximity [5]. This radar sensor is extremely sensitive to extraneous effects such as surface ripples and tilt, and requires a rather sensitive phase measurement
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