Inspecting industrial chimneys and smoke pipes can be costly and risky to humans. One can speed of the process with a micro aerial vehicles as this video from nimbro demonstrates:
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ChimneySpector: Autonomous MAV-based Indoor Chimney Inspection
This chimney inspection system is based on a lightweight drone that can maneuver in tight spaces. It has a multimodal sensor setup for navigation and obstacle avoidance. These drones come with a rotating 3D laser scanner and stereo cameras for high-resolution inspection.
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