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Proceedings Paper

The Thermo-Liner - An Instrument For Thermal Inspection
Author(s): Robert W. Astheimer; Gerald Falbel
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Paper Abstract

Infrared thermography has become an accepted technique for nondestructive testing and thermal inspection problems . Such applications often require knowledge of the temperature distribution over a localized area and much of a thermal picture is extraneous, useful only to position the field of view or locate the desired regions of interest. A battery operated hand-held viewer is described which superim-poses a graph of the temperature distribution along an indicated line, onto a direct visual image of a two-dimensional field. This is accomplished by an oscillating dichroic mirror, one side of which produces an infrared, single-line scan with a pyroelectric detector, while the other side causes an orthogonal array of 18 red LED's to scan across the field of the observer. The oscillating mirror is transparent in the blue-yellow spectral region so that the viewer sees the red diode array superimposed onto a blue-yellow visible image of the field. Appropriate LED's in the array are switched on depending upon the amplitude of the infrared signal, to generate the thermal profile or graph. Temperature variations down to 0.2°C can be accurately measured with a spatial resolution of 4 mrad. The operator observes the scene through the view-finder of a reflex camera, and can make a film recording of the subject and thermal profile at any time. Applications to field, and in-plant, thermal inspection will be illustrated.

Paper Details

Date Published: 20 January 1976
PDF: 6 pages
Proc. SPIE 0062, Modern Utilization of Infrared Technology I, (20 January 1976); doi: 10.1117/12.954448
Show Author Affiliations
Robert W. Astheimer, Barnes Engineering Company (United States)
Gerald Falbel, Barnes Engineering Company (United States)

Published in SPIE Proceedings Vol. 0062:
Modern Utilization of Infrared Technology I
Irving J. Spiro, Editor(s)

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