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| modulation grid | |||
| patterned chopping disk; chopper disk; chopping wheel; reticle (patterned chopping disk, which consists of opaque and transparent sections; it breaks up the incoming radiation and converts the incident dc signal into an ac signal; the reticle generates error signals and discriminates between large background sources and smaller target signals) | |||
| Modulationsscheibe: 2 phrases in 1 subject |
| Optics branch of physics | 2 |