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To measure the surface temperature distribution over a scene, infrared thermographic cameras are commonly used. Visible-light video cameras have the advantage of being more versatile, robust, cheap and easy to use than infrared cameras. They are available with three colour filters (for red, green and blue) and thus bichromatic temperature determination can be achieved. The ratio of the luminance in two of the three colours may be related to the temperature of the viewed object, assuming the grey body hypothesis. This laboratory set-up uses a colour video camera to analyse the visible luminance emitted by the tungsten coil of a lamp. The ratio of two colour components has been shown to be correlated to the lamp temperature (as measured by a bichromatic pyrometer). The variations of these ratios have been shown to be above the noise, including the variability between pixels. A virtual instrument for temperature analysis is under development using Concept VI, an image processing library under the LabVIEW Graphical programming language.

Additional information

Authors: JOURNEAU C, JRC Ispra (IT)
Bibliographic Reference: Paper presented : IEEE International Workshop, Como (IT), June 10-11, 1996
Availability: Available from (1) as Paper EN 39953 ORA
Record Number: 199610969 / Last updated on: 1996-09-30
Original language: en
Available languages: en
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