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Scantron readers use LED's as light sensors? I assumed they used regular photo sensors. The older form readers used metal brushes that detected the conductivit
by Johnny555 8y ago
Scantron readers use LED's as light sensors? I assumed they used regular photo sensors.
The older form readers used metal brushes that detected the conductivity of the graphite in pencil lead.
- DataJunkie 8y agoIt's possible that the "newest" ones use photo sensors as they now also double as standard desktop scanners, but I'm not sure they would be marketed as OMR. I suspect Scantron and Pearson NCS won't be around much longer as standard scanners are much cheaper, can accomplish the same goals (minus printing results on the form, without a special attachment on expensive scanners), and embedded processing continues to grow.