In powder bed AM (additive manufacturing) processes, a build is produced
on top of a metallic build platform. The presence of foreign objects upon this
platform can induce different problems, from motor servo shutdown to a fire
hazard. Here we present an active thermography approach to detect such foreign
objects before their presence can harm the system. The approach is based on the
differential thermographic response of the build platform vs. common foreign
objects to irradiative heating.
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INC, HP, "PLATFORM FOREIGN OBJECT DETECTION SYSTEM", Technical Disclosure Commons, (November 29, 2018)