High accuracy circuitry for correcting edge errors in scanning radiometers

Claim 1

A SYSTEM FOR CORRECTING EDGE ERRORS IN A SCANNING RADIOMETER COMPRISING (A) AN INFRARED DETECTOR WHICH IS ADAPTED TO SCAN TO DETECT THERMAL DISCONTINUITIES, (B) A FIRST BISTABLE LEVEL-SENSITIVE MEANS CONNECTED TO SAID DETECTOR FOR RECEIVING DETECTOR OUTPUT, (C) A SECOND BISTABLE LEVEL-SENSITIVE MEANS CONNECTED TO SAID DETECTOR FOR RECEIVING DETECTOR OUTPUT, (D) MODULATION MEANS CONNECTED TO SAID FIRST BISTABLE LEVEL-SENSITIVE MEANS FOR MODULATING OUTPUT OF SAID FIRST BISTABLE LEVEL-SENSITIVE MEANS WITH A REFERENCE SIGNAL, (E) FIRST INTEGRATION MEANS FOR INTEGRATING THE OUTPUT OF SAID MODULATION MEANS, (F) FIRST AND SECOND PULSE GENERATING MEANS COUPLED TO SAID FIRST AND SECOND LEVEL-SENSITIVE MEANS FOR GENERATING PULSES HAVING PULSE WIDTHS CORRESPONDING TO TIME INTERVALS BETWEEN THE LEVELS OF SAID FIRST AND SECOND LEVEL-SENSITIVE MEANS AND POLARITIES DEPENDING ON WHETHER THE DETECTOR OUTPUT IS INCREASING OR DECREASING BETWEEN THE LEVELS SET BY THE FIRST AND SECOND LEVEL-SENSITIVE MEANS, (G) SECOND INTEGRATION MEANS FOR INTEGRATING THE PULSES FROM SAID FIRST AND SECOND PULSE GENERATING MEANS, AND (H) MEANS FOR COMBINING THE OUTPUTS OF SAID FIRST AND SECOND INTEGRATING MEANS TO PRODUCE AN ERROR SIGNAL WHICH MAY BE USED FOR COMPENSATING THE EDGE ERRORS.