Apparatus and method for measuring the emissivity of an object

Abstract

Abstract 1. A device for determining, eventually without contact, the emissive power (or emissivity) of a product which may be moving, comprising a "sensor" unit (1') which includes a surface almost fully absorbent and a surface almost totally reflective with regard to the radiation emitted by the product, characterized in that : a) each of the said surfaces is shaped so as to form a chamber (2, 3) which can be sealed off by a wall (4, 5) formed by the said product ; b) the two chambers (2, 3) are set up side by side and a small distance apart ; c) each chamber (2, 3) is provided with a pyrometer arranged in such a way as to effect direct scanning of the wall (4.5) of the chamber formed by the said product ; d) means (14, 15, 18, 26) are provided for moving and positioning the sensor unit (1') close to the product to be examined, these means embodying and end-of-travel system and return system, as well as a to-and-fro mechanism functioning cyclically at a predetermined rate, and also e) means of correcting and processing the signals given by the two pyrometers, in order to provide a signal representative of the emissive power of the product concerned.

Inventors

• 👤 Jean-Paul François Fischbach

Bibliographic Details