Apparatus and method for sensing fluid level

Details Apparatus and method for sensing fluid level Apparatus and method for sensing fluid level

1997-05-07

1998-05-05

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

73293, G01F 2300

Patent

active

057478244

ABSTRACT:
An array of four infrared LEDs and an array of four phototransistor receivers with each LED and phototransistor mounted inside a light baffle. The LEDs are positioned in a substantially vertical array just outside one side wall of the cassette. The vertical line on which the LEDs are arranged is substantially parallel to the direction in which the fluid/air interface moves within the cassette. The LEDs are aimed upwardly at an angle of approximately 20.degree. from horizontal. A corresponding substantially vertical array of four phototransistor receivers is mounted outside the cassette opposite the LEDs such that each of the receivers is aimed at its corresponding LED.

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Excerpts from pp. 3-3, 3-13 & 3-14 of the Series Ten Thousand.RTM. Ocutome.RTM. STTOdx.TM. Cavitron/Kelman.RTM. Phaco-Emulsifier.RTM. Aspirator Service Manual; Alcon Laboratories, Inc., 1993.
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