Synchronized electronic shutter system (SESS) for thermal nondestructive evaluation

Joseph N. Zalameda

doi:10.1117/12.421044

23 March 2001 Synchronized electronic shutter system (SESS) for thermal nondestructive evaluation

Joseph N. Zalameda

Proceedings Volume 4360, Thermosense XXIII; (2001) https://doi.org/10.1117/12.421044
Event: Aerospace/Defense Sensing, Simulation, and Controls, 2001, Orlando, FL, United States

Abstract

The purpose of this paper is to describe a new method for thermal nondestructive evaluation. This method uses a synchronized electronic shutter system (SESS) to remove the heat lamp's influence on the thermal data during and after flash heating. There are two main concerns when using flash heating. The first concern is during the flash when the photons are reflected back into the camera. This tends to saturate the detectors and potentially introduces unknown and uncorrectable errors when curve fitting the data to a model. To address this, an electronically controlled shutter was placed over the infrared camera lens. Before firing the flash lamps, the shutter is opened to acquire the necessary background data for offset calibration. During flash heating, the shutter is closed to prevent the photons from the high intensity flash from saturating the camera's detectors. The second concern is after the flash heating where the lamps radiate heat after firing. This residual cooling introduces an unwanted transient thermal response into the data. To remove this residual effect, a shutter was placed over the flash lamps to block the infrared heat radiating from the flash head after heating. This helped to remove the transient contribution of the flash. The flash lamp shutters were synchronized electronically with the camera shutter. Results are given comparing the use of the thermal inspection with and without the shutter system.

Citation Download Citation

Joseph N. Zalameda "Synchronized electronic shutter system (SESS) for thermal nondestructive evaluation", Proc. SPIE 4360, Thermosense XXIII, (23 March 2001); https://doi.org/10.1117/12.421044

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