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Stress Photonics demonstrated the Coating Tolerant Thermography method at the FHWA Turner-Fairbanks Laboratory where a large steel girder (shown below) had been fatigue tested to establish visible and invisible cracks.
Steve Chase of Turner-Fairbanks picked a series of bridge details that represented typical field scenarios including:
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Steel Girder at Turner-Fairbanks Lab |
Only a simple stationary pattern projector was used at the demonstration. The projected hot stripe was manually moved from side to side as thermal images were collected. Both the oscillating mirror method and the all-digital method of gradient measurement were used depending on the situation. Absolutely no surface preparation was performed on any of the details on the girder.
Continue on using the arrows above or jump right to any of the three tests listed below.
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