Radiation tracking system using lateral photoeffect transducer

Claim 1

A RADIATION TRACKING SYSTEM COMPRISING A LATERAL PHOTOEFFECT TRANSDUCER HAVING FOUR OHMIC CONTACTS GENERATING VOLTAGES RELATED TO THE POSITION AT WHICH ELECTROMAGNETIC RADIATION IMPINGES ONN SAID TRANSDUCER, MEANS TO INTERMITTENTLY SHORT CIRCUIT TO GROUND ONE DIAMETRICALLY OPPOSED PAIR OF SAID CONTACTS, RETICLE MEANS FOR INTERRUPTING SAID RADIATION IMPINGING ON SAID TRANSDUCER, FIRST AND SECOND CONTROLLABLE GAIN AMPLIFYING MEANS CONNECTED TO RESPECTIVE ONES OF THE OTHER PAIR OF SAID CONTACTS, FIRST AND SECOND AUTOMATIC GAIN CONTROL CIRCUITS CONNECTED TO THE INPUTS OF SAID FIRST AND SECOND AMPLIFIERS, RESPECTIVELY, SAID FIRST AND SECOND CIRCUITS PRODUCING FIRST AND SECOND GAIN CONTROL VOLTAGES, SAID FIRST VOLTAGE BEING APPLIED TO CONTROL THE GAIN OF SAID SECOND AMPLIFIER AND SAID SECOND VOLTAGE BEING APPLIED TO CONTROL THE GAIN OF SAID FIRST AMPLIFIER, MEANS FOR DIFFERENTIALLY COMPARING THE VOLTAGES GENERATED AT THE OUTPUTS OF SAID FIRST AND SECOND AMPLIFIERS TO PRODUCE AN OUTPUT SIGNAL REPRESENTING THE POSITION AT WHICH SAID RADIATION IMPINGES ON SAID TRANSDUCER, AND MEANS RESPONSIVE TO SAID OUTPUT SIGNAL FOR ORIENTING SAID TRANSDUCER RELATIVE TO THE DIRECTION OF SAID RADIATION IMPINGING ON SAID TRANSDUCER.