Drop detecting system which operates under different ambient lig

Details Drop detecting system which operates under different ambient lig Drop detecting system which operates under different ambient lig

1987-03-23

1988-01-19

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

128DIG13, 340606, 604 31, 604246, A61M 516, G01N 2185

Patent

active

047206365

ABSTRACT:
A drop detecting system has light emitting diodes and phototransistors located on either side of a translucent drip chamber. The phototransistors respond to either the shadow or the reflection from a drop falling through a light beam produced by the light emitting diodes. The electrical response from the phototransistors is conducted to an integrator circuit which generates an electrical signal voltage. A comparator circuit receives the electrical signal voltage from the integrator circuit and outputs a signal indicating the presence of a drop passing through the drip chamber. A drip chamber housing cooperates with the drip chamber to shroud the translucent portion of the drip chamber. Additionally the drip chamber housing provides for the mounting of the light emitting diodes and the phototransistors.

REFERENCES:
patent: 3867628 (1975-02-01), Brown
patent: 4038982 (1977-08-01), Burke et al.
patent: 4321461 (1982-03-01), Walter, Jr. et al.
patent: 4490140 (1984-12-01), Carr et al.

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