Black infrared radiation detector standard

Claim 1

A BLACK RADIATION DETECTOR STANDARD FOR THE SPECTRAL CALIBRATION OF LONG-WAVELENGTH INFRARED DETECTORS AND THE LIKE COMPRISING: (A) A HOLLOW THIN-WALL CONE OF HIGHLY ELECTRICAL AND HEAT CONDUCTIVE MATERIAL HAVING THE BASE THEREOF OPEN TO EXPOSE THE CONICAL CAVITY TO INCIDENT RADIATION, (B) THE INTERNAL SURFACE OF SAID CONE BEING BLACKENED WITH A COATING OF MATERIAL HAVING HIGH ABSORPTION CHARACTERISTICS IN THE LONG WAVELENGTH REGION OF 1-15 MICRONS, THIS ABSORPTION OF THE COATING TOGETHER WITH THE CONICAL GEOMETRY OF SAID CAVITY RESULTING IN ABSORPTION OF NEARLY ALL INCIDENT RADIATION INDEPENDENT OF THE WAVELENGTH OF THE INCIDENT RADIATION, (C) A THERMOCOUPLE JUNCTION TO TRANSDUCE THE INCIDENT RADIANT ENERGY INTO AN ELECTRICAL SIGNAL ATTACHED DIRECTLY TO THE OUTER SURFACE OF SAID CONE AT A POINT MIDWAY BETWEEN THE BASE AND APEX OF THE CONE, (D) THE OTHER ENDS OF THE TWO WIRES OF THE THERMOCOUPLE BEING ELECTRICALLY FASTENED TO RESPECTIVE ELECTRODE SUPPORT MEANS SAID THERMOCOUPLE WIRES BEING THE ONLY MEANS OF MECHANICAL SUPPORT FOR SAID CONE TO A REDUCE THERMAL CONDUCTANCE FROM SAID CONE TO A MINIMUM FOR MAXIMUM SENSITIVITY OF THE DETECTOR.