Accession Number : AD0651341

Title :   THERMAL CALIBRATORS IN MILLIMETER-WAVE RADIOMETRY,

Corporate Author : HARRY DIAMOND LABS WASHINGTON D C

Personal Author(s) : Singer,A. ; Ulrich,R. R. ; Naess,E.

Report Date : MAR 1967

Pagination or Media Count : 18

Abstract : Semitransparent materials, such as transite and marinite-65, are examined for their suitability as thermal calibrators in millimeter-wave radiometry. A differential equation is derived for the effective black-body temperature of a semitransparent material having an arbitrary cross-sectional temperature distribution. The equation essentially corrects for the temperature contributions of the layers beneath the surface. It is shown that at 70 GHz an error as large as 20 percent can be incurred in the calibration of a radiometer when these contributions are neglected. (Author)

Descriptors :   (*MATERIALS, BLACKBODY RADIATION), (*CALIBRATION, MATERIALS), RADIOMETERS, MILLIMETER WAVES, DIFFERENTIAL EQUATIONS, THERMAL PROPERTIES

Subject Categories : Test Facilities, Equipment and Methods
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE