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What are the factors which are responsible for the time required to read out the number of elements in a circular scan?

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What are the factors which are responsible for the time required to read out the number of elements in a circular scan?

(a) Size of scanner

(b) Property of photodiode

(c) Average scan time for reading

(d) Frequency of input clock and number of elements

I have been asked this question in an interview for job.

Enquiry is from Circular Scanning topic in chapter Machine Vision Systems of Engineering Metrology

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Right answer is (d) Frequency of input clock and number of elements

Best explanation: The requirements of light intensity are a function of the circular scan time and the physical size of each photodiode. The total time required to read out the number of elements is a function of the input clock and the number of elements in the array.

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