Apparatus for the correlation of two variables

Claim 1

APPARATUS FOR CROSS-CORRELATING TWO VARIABLES ONE OF WHICH R(T) INCLUDES A PROPERTY WHICH IS RESPRESENTED BY VARIATIONS IN AN ENERGY FIELD AS A FUNCTION OF DISTANCE AND WHICH IS TO BE CORRELATED WITH A PROPERTY OF THE OTHER VARIABLE G(T), WHEREIN THE APPARATUS INCLUDES A DETECTOR COMPRISING A PLURALITY OF DETECTING ELEMENTS, MEANS FOR RELATIVELY MOVING THE DETECTOR AND THE ENERGY FIELD, SAID DETECTING ELEMENTS BEING SPACED ALONG A LINE WHICH IS PARALLEL TO THE DIRECTION OF RELATIVE MOVEMENT OF THE ENERGY FIELD WITH RESPECT TO THE DETECTOR, THE DISTANCES BETWEEN THE DETECTING ELEMENTS AND THE OUTPUTS SENSITIVITIES THEREOF REPRESENTIING A PREDETERMINED FUNCTION OF THE VARIABLE G(T) SUCH THAT EACH DETECTING ELEMENTS PRODUCES AND OUTPUT WHICH REPRESENTS A PRODUCT OF ITS OWN OUTPUT SENSITIVITY AND THE MAGNITUDE OF THE SAID PROPERTY OF THE VARIABLE R(T), SAID DETECTOR INCLUDING MEANS FOR ATTENUATING A PREDETERMINED HARMONIC OF THE FUNDAMENTAL FREQUENCY CONTENT OF ONE THE VARIABLES, AND MEANS FOR ADDING THE OUTPUTS OF THE DETECTING ELEMENTS TO PRODUCE AND OVERALL DETECTOR OUTPUT WHICH REPRESENTS THE RUNNING CROSS-CORRELATION FUNCTION OF THE TWO VARIABLES WITH SAID PREDETERMINED HARMONIC ATTENUATED.