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US 4,072,424 AGranted
Optical device for measuring the turbidity of a liquid
OwnerJames P. McMullan, Albert Stevensinventors
Life of this patent
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OwnerJames P. McMullan, Albert Stevensinventors
Estimating the term…
A turbidimeter having an elongate fluid conducting body with an access opening at one end and spaced fluid inlet and outlet openings with means to connect the body between sections of a fluid conducting line, a plug-like service unit releasably engaged with and normally closing the body, a light emitter, a conducting light pipe conducting light from the emitter to the end of the body remote from the unit and directing light back towards the unit, a first photo cell carried by the unit and receiving light directed by the light pipe, a second photo cell matched with the first photo cell heat sink means to equalize the temperatures of the cells, power supply and signal transmitting means for the emitter and for the cells, said signal transmitting means including means comparing the signals from the cells.
A turbidimeter comprising a chest with an elongate fluid conducting chamber having upstream and downstream sides, inlet and outlet ports communicating with the upstream and downstream sides of the chamber between the ends thereof, flow directing means in the chamber in the upstream side portion thereof directing fluid flowing into the chamber through the inlet port longitudinally outwardly toward the opposite ends and thence toward the downstream side of the chamber, a light emitter at one end of the chest outside the chamber, an elongate light conducting light pipe with an inlet end exposed to the emitter, extending longitudinally freely through the chamber and having a recurvate free end portion with an outlet end in the chamber at the other end portion of the chest and disposed toward said one end of the chest and across which fluid directed toward said other end and thence downstream in the chamber by said flow directing means is directed, a light responsive photo cell at said one end of the chest outside the chamber in alignment with the outlet end of the light pipe, a light conducting window between the cell and chamber with a surface within the chamber and across which fluid directed toward said one end and thence downstream in the chamber by the flow directing means is directed.
Dependencies are inferred from the claim text.