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Circular scanners are consists of which type of diodes?

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Circular scanners are consists of which type of diodes?

(a) Monolithic arrays of silicon photodiodes

(b) Silicon avalanche photodiodes

(c) Multi element silicon photodiodes

(d) Two dimensional arrays of silicon photodiodes

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This interesting question is from Circular Scanning topic in section Machine Vision Systems of Engineering Metrology

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Correct choice is (a) Monolithic arrays of silicon photodiodes

Explanation: Circular scanners devices consist of monolithic arrays of silicon photodiodes. These are self-scanned photodiode arrays which have their geometry, (like a number of elements, aperture width, angular resolution, element spacing etc.) defined.

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