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| physical object > artifact > device > instrument > optical device > detector > imager > integrating detector > heliograph | 
| heliograph comparison table | ||
| Subject | has definition | is a kind of | 
|---|---|---|
| integrating detector | Any 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 | 
| heliograph | Device for recording the positions of sunspots. | integrating detector | 
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