Two color radiometer for distinguishing radiations from sources at dieferent temperatures

Claim 1

AN INSTRUMENT FOR THE DETECTION OF RADIATIONS FROM A SOURCE AT A LOWER COLOR TEMPERTURE FROM THAT OF ONE MARKEDLY HIGHER COLOR TEMPERATURE WHICH COMPRISES A RADIATION DETECTOR RESPONDING TO A WAVELENGTH BAND NEAR THE PEAK RADIATION OF THE SOURCE OF LOWER COLOR TEMPERATURE, A SECOND DETECTOR RECEIVING A RADIATION BAND NEAR THE PEAK WAVELENGTH OF THE HIGHER COLOR TEMPERATURE SOURCE, ELECTRONIC AMPLIFYING CIRCUITS CONNECTED TO THE LOW COLOR TEMPERATURE DETECTOR AND INCLUDING DIFFERENTIATING MEANS AND MEANS FOR SUPPRESSION OF PULSES OF ONE POLARITY, AN OUTPUT GATE IN SAID CIRCUITS, ELECTRONIC CIRCUITS CONNECTED TO THE OUTPUT OF HIGH COLOR TEMPERATURE DETECTOR SAID CIRCUITS INCLUDING DIFFERENTIATING MEANS AND MEANS FOR SUPPRESSING PULSES OF POLARITY OPPOSITE TO THAT OF THE PULSES SUPPRESSED IN THE CIRCUITS CONNECTED TO THE OUTPUT OF THE LOW COLOR TEMPERATURE DETECTOR AND CONNECTING MEANS FROM THE OUTPUT OF THE CIRCUITS TO CLOSE THE GATE, WHEREBY WHEN THERE IS PRESENT RADIATION STRIKING BOTH DETECTORS THERE WILL BE NO RESPONSE BECAUSE THE GATE IS CLOSED AND RESPONSE WILL BE OBTAINED ONLY WHEN THERE IS A CHANGE RADIATION STRIKING THE LOW COLOR TEMPERATURE DETECTOR WITHOUT A CHANGE IN RADIATION STRIKING THE HIGH COLOR TEMPERATURE DETECTOR.