Method of and an apparatus for measuring surface temperature and emmissivity of a heated material

  • US 4,465,382 A
  • Filed: 03/02/1981
  • Issued: 08/14/1984
  • Est. Priority Date: 03/04/1980
  • Status: Expired due to Fees
First Claim
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1. A method for measuring the surface temperature T1 and emissivity ε



  • ) at an angle θ

    , of an object being heated in a furnace, the surface of said object being non-specularly reflecting, said furnace having a wall temperature T4, said method comprising the steps of;

    determining a diffusely reflecting factor p for the material and surface roughness of said object where said roughness inhibits accurate measurement of T1 should specularity of the surface be assumed, to account for the non-specularly reflecting condition of said surface;

    measuring T4 ;

    positioning a radiometer and at least one black body radiator specularly and symmetrically at angles θ

    with respect to a normal to said surface of said object;

    with said black body radiator at a temperature T2, emitting radiant energy Eb (T2) toward said surface;

    with said radiometer, detecting radiant energy E2 as a result of energy emitted by and reflected from said surface;

    with said black body radiator at a temperature T3

    T2, emitting radiant energy Eb (T3) toward said surface;

    with said radiometer, detecting radiant energy E3 as a result of energy emitted by and reflected from said surface;

    determining ε



    ) in accordance with the relationships ##EQU32## determining T1 in accordance with the relationship ##EQU33##

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