Apparatus embodying plural light paths for measuring the turbidity of a fluid

Claim 1

AN APPARATUS FOR MEASURING TURBIDITY WITHIN A BODY OF FLUID COMPRISING A CASING ADAPTED TO BE IMMERSED IN THE FLUID TO BE TESTED, SAID CASING HAVING A PASSAGEWAY DEFINED THEREIN FOR PASSAGE OF THE FLUID, A SINGLE LIGHT SOURCE DISPOSED IN SAID CASING, SAID PASSAGEWAY HAVING OPPOSITELY DISPOSED LIGHT TRANSMITTING PANELS THEREIN, A PAIR OF LIGHT SENSITIVE CELLS HAVING A LIMITED FIELD OF VIEW, SAID LIGHT SENISTIVE CELLS BEING MOUNTED ON SAID CASING AND DISPOSED SUBSTANTIALLY SO THAT THE AXES OF SAID LIGHT SENSITIVE CELLS ARE SUBSTANTIALLY PERPENDICULAR TO AN IMAGINARY LINE JOINING THE LIGHT TRANSMITTING PANELS, A PAIR OF LENS AND MIRROR SYSTEM DISPOSED IN TH CASING FOR TRANSMITTING TWO BEAMS OF LIGHT FROM THE SINGLE SOURCE AND PROJECTING THE BEAMS OF LIGHT TOWARDS EACH OTHER THROUGH THE OPPOSITELY DISPOSED LIGHT TRANSMITTING PANELS WHEREBY THE LIGHT REFLECTED BY PARTICLES IN THE FLUID SUBSTANTIALLY PARALLELLY TO THE AXES OF THE LIGHT SENSITIVE MEANS MOUNTED UPON SAID LIGHT SENSITIVE CELLS, REFLECTIVE MEANS MOUNTED ON SAID CASING IN DIRECT OPPOSITION TO THE LIGHT SENSITIVE CELLS FOR REFLECTING ANY LIGHT REFLECTED BY PARTICLES IN THE DIRECTION OF THE REFLECTIVE MEANS TOWARDS THE CELLS FOR IMPINGEMENT OF THE REFLECTED LIGHT ON THE LIGHT SENSITIVE CELLS AND A RESISTANCE ELECTRICAL BRIDGE CIRCUIT COMPRISING SAID LIGHT SENSITIVE CELLS IN ONE BRANCH AND AT LEAST ONE METER IN THE BRIDGE CIRCUIT DIAGONAL SO AS TO GIVE AN INDICATION OF THE TURBIDITY OF SAID FLUID.