System and method of determining fluid levels in containers...

Details System and method of determining fluid levels in containers... System and method of determining fluid levels in containers...

2009-02-24

2010-02-16

Le, Que T (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S221000

Reexamination Certificate

active

07663130

ABSTRACT:
A system and method of determining fluid levels in containers is disclosed. In a particular embodiment, a first value of infrared energy associated with an empty portion of a container is detected and the container is scanned to detect a second value of infrared energy that is different from the first value of infrared energy. The method also includes to store an upper limit value associated with a vertical location of an upper surface of a fluid level when the second value of infrared energy is detected and to scan the container to detect a third value of infrared energy that is different from the second value of infrared energy. In addition, a lower limit value associated with a vertical location of a lower surface of the fluid relative to the upper surface is stored when the third value of infrared energy is detected. A height of the fluid is determined using a difference between the upper limit value and the lower limit value.

REFERENCES:
patent: 3225191 (1965-12-01), Calhoun

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