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Which kind of filter is used in improved version of infrared gas analyzer at the output end?

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Which kind of filter is used in improved version of infrared gas analyzer at the output end?

(a) Low pass filter

(b) High pass filter

(c) Narrow bandpass filter

(d) Wide bandpass filter

This question was addressed to me in an online interview.

The above asked question is from Infrared Gas Analysers topic in chapter Industrial Gas Analysers of Analytical Instrumentation

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The correct option is (c) Narrow bandpass filter

To explain I would say: The filter is used in an improved version of infrared gas analyzer at the output end is narrow bandpass filter. The bandpass characteristics are matched with the absorption spectra of the gas of interest.

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