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The diagram given below is the representation of Fourier transform interferometer. Identify the missing block in the block diagram.

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The diagram given below is the representation of Fourier transform interferometer. Identify the missing block in the block diagram.

(a) Pyroelectric crystal

(b) Display

(c) High speed plotter

(d) A/D converter

This question was posed to me in an interview for job.

My question is based upon Fourier Transform Infra-red Spectrometers in section Colorimetry and Spectrometry of Analytical Instrumentation

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Correct choice is (d) A/D converter

For explanation: Computer does not accept analog signals directly. An A/D converter is required to feed the signals to the computer.

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