| 摘要 |
A system for detecting shadow edges by use of a linear array of photodiodes whose output is a Gray Type Code is described. Because of the unique connections of the diodes into pairs and the appropriate use of logic circuitry, the diodes can be arranged in a linear, or single line, array. As a result of the Gray Code type of output, the shadow edge is unambiguously located within a single diode spacing.
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