Fiber optic level detector
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United States of America Patent
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Oct 5, 2004
Grant Date -
Feb 26, 2004
app pub date -
Aug 13, 2003
filing date -
Aug 15, 2002
priority date (Note) -
Expired
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Abstract
A fiber optic liquid level detector uses optical fibers to detect the presence or absence of liquids. The waveguide properties of optical fibers tends to deviate from the normal dielectric interfaces so that a fiber immersed in a liquid has a reflection coefficient smaller than when surrounded by air. This is caused by the differences in refractive indices of liquid and air and is used to measure the amount of light transmitted or reflected by the fiber in the preserve or absence of a liquid.
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