23 January 1997 Self-contained decoating method utilizing a high-peak-power flashlamp
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Abstract
This paper will deal with the ability of a high energy flashlamp to decoat surfaces using a photoablation method. The flashlamp produces a broad-band near-blackbody radiation spectrum that peaks in the far-UV. We call this flashlamp a near-blackbody radiator because of its ionization characteristic that is predominantly composed of free-bound transitions, and because of its high emissivity that ranges from 0.89 across the UV band to almost unity across the VIS and IR bands. Three distinct phases divide the flashlamp photoablation process: (1) Initial photoablation of the coating by the intense light energy pulse of the flashlamp; (2) VOC scrubbing of the newly created vapor and plasma layer by the UV component of the light pulse; (3) Removal and trapping of the resulting fine ash and residual fumes by chemical and mechanical means. In order to accomplish the first two phases, the peak plasma temperatures generated within the flashlamp must be on the order of 7500K to 15000K with pulse durations ranging between 170-680microsecond(s) ec. Even though the peak power of the flashlamp is high for its size, ranging from 12-30Mw, the lamp lifetime is reasonable at 1- 10 million shots. It is this high lamp lifetime, as well as the flashlamp system's inherent simplicity, that makes the system cost effective and rugged for the application being proposed in this paper.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
James B. Bender, "Self-contained decoating method utilizing a high-peak-power flashlamp", Proc. SPIE 2997, Integrated Optics Devices: Potential for Commercialization, (23 January 1997); doi: 10.1117/12.264146; https://doi.org/10.1117/12.264146
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