Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
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.
REFERENCES:
patent: 4123227 (1978-10-01), Heim et al.
patent: 4297588 (1981-10-01), Hastbacka
patent: 4395258 (1983-07-01), Wang et al.
patent: 4425794 (1984-01-01), Duesbury
patent: 4450722 (1984-05-01), Keyes, IV et al.
patent: 4493695 (1985-01-01), Cook
patent: 4627833 (1986-12-01), Cook
patent: 4680475 (1987-07-01), Transony et al.
patent: 4703314 (1987-10-01), Spani
patent: 4713051 (1987-12-01), Steppe et al.
patent: 4758238 (1988-07-01), Sundblom et al.
patent: 4773897 (1988-09-01), Scheller et al.
patent: 4790816 (1988-12-01), Sundblom et al.
patent: 4798580 (1989-01-01), DeMeo et al.
patent: 4920336 (1990-04-01), Meijer
patent: 5267956 (1993-12-01), Beuchat
patent: 5364342 (1994-11-01), Beuchat et al.
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.
Schematic, PCB, M/A Pneumatic Control; Dwg. No. 940-8040-025; Alcon Surgical, 1990.
Schematic, PCB, Photocell, Cassette; Dwg. No. 940-8040-002; Cooper Vision, 1987.
Schematic, PCB, LED, Cassette; Dwg. No. 940-8040-001; Cooper Vision, 1987.
Peter Weber: Optical Sensor Measures Filling Levels in Glass Tubes; Feinwerktechnik & Messtechnik, 99, No. 1/2 (1991), pp. 31-33.
Jung Christopher C.
Nazarifar Nader
Alcon Laboratories Inc.
Pyo Kevin
Schira Jeffrey S.
Westin Edward P.
LandOfFree
Apparatus and method for sensing fluid level does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus and method for sensing fluid level, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for sensing fluid level will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-57080