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Lapis Semiconductor (Oki Semi spin-off) comes with a low-cost and low resolution thermopile-based image sensor, the ML8540WD:
Meanwhile, for quite a some time Melexis has been selling its own low-cost IR sensor, the 16 x 4 pixel MLX90620. The sensor features in Youtube video:
MicroMountains Applications AG, Germany publishes a popular review of low-cost 3D and IR sensor technologies. Here is the comparison of thermal IR approaches:
Update: Another view on IR imaging market from Schneider Electric presentation in Leti, June 2013:
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