Liquid level sensor
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United States of America Patent
Stats
-
Oct 12, 1982
Grant Date -
N/A
app pub date -
Oct 23, 1980
filing date -
Oct 23, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In order to sense a liquid level, an input light pipe and output light pipe have angled ends such that light supplied to the input light pipe is directed from it to the output light pipe by total internal reflection as long as the ends are in a gas. When in a liquid, the index is such as to cause light in the input light pipe to refract into the liquid and not reach the output light pipe. By observing the other end of the output light pipe it becomes possible to determine if the angled ends are in liquid or gas, and thus detect a liquid level.
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