DROP MONITOR
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Abstract
THIS APPLICATION RELATES TO METHODS AND APPARATUS FOR MONITORING THE DROP BY DROP FLOW OF FLUID AND IT IS DESCRIBED, IN THE SPECIFICATION, PARTICULARLY IN RELATION TO THE MONITORING OF FLOW IN AN INTRAVENOUS FEEDING OR INJECTION SET. FLUID FLOW IS REDUCED TO A SUCCESSION OF DROPS THROUGH A DISTANCE ALONG A FREE-FALL PATH. AS SUCCESSIVE DROPS FALL PAST A SENSING POINT IN THAT PATH, A SIGNAL IS INITTIATED AND IS MADE TO ENDURE FOR A PERIOD LONGER THAN THE PERIOD REQUIRED FOR THE DROP TO PASS THE SENSING POINT. AN ELECTRO-OPTICAL SENSING AND INDICATING SYSTEM IS SHOWN IN WHICH THE PRESENCE OF A DROP AT THE SENSING POINT MODIFIES THE QUANTITY OF LIGHT REACHING A LIGHT SENSITIVE SENSOR FROM A SOURCE. SENSITIVITY AND RESPONSE OF THE SYSTEM IS ENHANCED BY EMPLOYING CONTROLLED REGENERATION OR POSITIVE FEEDBACK.
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