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Infrared thermography system on DIII‐D

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4 Author(s)
Petrie, T.W. ; General Atomics, San Diego, California 92186‐9084 ; Hill, D.N. ; Baptista, J. ; Brown, M.

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Six infrared cameras measure temperature changes on the protective graphite armor inside the DIII‐D vacuum vessel. Simultaneous time‐dependent temperature measurements are made on armor tiles located on the centerpost and divertor regions, and on both outboard limiters. The nearly complete poloidal coverage is useful in measuring both the plasma heat flux distributions inside the vessel and the plasma power balance. Spatial resolution of each camera system is ≲1 cm, while the minimum resolvable time is 125 μs. Data from the IR TV systems are recorded on video tape, and are post‐processed serially, using an image processor with an AT‐compatible microcomputer. The processing system controls all VCRs, interprets DIII‐D timing pulses, digitizes video data in the predetermined regions of interest, averages digitized signals to reduce noise, and constructs data files which are then stored as part of the permanent shot record.

Published in:

Review of Scientific Instruments  (Volume:61 ,  Issue: 11 )