Self-compensating optical drop count apparatus for measuring vol

Details Self-compensating optical drop count apparatus for measuring vol Self-compensating optical drop count apparatus for measuring vol

1979-10-09

1982-02-09

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

By counting drops, bubbles, or particles

128214E, 128DIG13, G01F 1300, A61M 500

Patent

active

043144845

ABSTRACT:
A self-compensating optical drop count apparatus for measuring volumetric fluid flow by optically counting the number of drops of fluid that pass through a drop chamber, each drop being formed so as to be of approximate equal volume. Optical counting circuitry is designed to count each drop only once. The count is accumulated in a holding register where it may interface with external instrumentation equipment adapted to display the count and/or convert it to a volumetric measurement by multiplying it by the average volume of fluid contained in each drop. A compensation technique is utilized to maintain the intensity of a light beam, through which the drops must pass, at a constant level. Compensation is achieved in a closed loop system which varies the drive current to the light emitter to compensate for long-term variations that occur in the intensity of the light beam as sensed at a light detector. Compensation techniques are also utilized in converting the count to a volumetric measurement to account for known changes in drop volume as a function of drop rate.

REFERENCES:
patent: 3563090 (1971-02-01), Deltour
patent: 3593579 (1971-07-01), Hindman
patent: 3890968 (1975-06-01), Pierce
patent: 4038982 (1977-08-01), Burke et al.
patent: 4105028 (1978-08-01), Sadlier
patent: 4173224 (1979-11-01), Marx et al.
patent: 4181130 (1980-01-01), Bailey

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