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physical object > artifact > device > instrument > optical device > detector > imager > integrating detector > heliograph
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heliograph comparison table
Subject has definition is a kind of
integrating detectorAny imaging device, like a photographic emulsion or CCD, which can build up more signal and contrast by a longer exposure to light or other electromagnetic energy.imager
heliographDevice for recording the positions of sunspots.integrating detector

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