NON-PRISMATIC OPTICAL LIQUID LEVEL SENSING ASSEMBLY
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United States of America Patent
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Dec 16, 2003
Grant Date -
Dec 25, 2003
app pub date -
Oct 11, 2002
filing date -
Nov 7, 2001
priority date (Note) -
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Abstract
An optically based liquid level (liquid-vapor) detector for use with a window having a substantially planar side facing the liquid-vapor side and a substantially planar side positioned parallel to the liquid-vapor side facing the outside. The detector comprises a light source positioned on the outside of the window to direct its light through the outside planar side to the inside planar liquid-vapor side and a light detector positioned on the outside of the window to receive light transmitted from the source and returned from the planar liquid-vapor window side. The detector further includes electronic means for detecting the light intensity change affecting the transducer, from the condition of liquid on the liquid-vapor side, to the condition of vapor on the liquid-vapor side of the window, whereby an action or signal is generated in response to such change.
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