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11 June 2002 Estimating temperature rise in pulsed thermography using irreversible temperature indicators
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One of the nondestructive thermography inspection techniques uses photographic flash lamps. The flash lamps provide a short duration (about 0.005 sec) heat pulse. The short burst of energy results in a momentary rise in the surface temperature of part. The temperature rise may be detrimental to the top layer of part. Therefore, it is necessary to ensure the nondestructive nature of the technique. Heat damage is dependent upon the magnitude of temperature rise. A direct method for the temperature measurement uses an infrared pyrometer or camera with a response time shorter than the flash duration. In this paper, an alternative technique is given using the irreversible temperature indicators. This is an indirect technique and it measures the temperature rise on the irreversible temperature indicators and computes the incident flux. Once the flux is known, the temperature rise on part can be computed. A wedge shaped irreversible temperature indicator for measuring the flux is proposed. A procedure is given to use the wedge indicator.
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Ajay M. Koshti "Estimating temperature rise in pulsed thermography using irreversible temperature indicators", Proc. SPIE 4702, Smart Nondestructive Evaluation for Health Monitoring of Structural and Biological Systems, (11 June 2002);

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