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In-situ cross stack analysers work behind which of the following principles?

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In-situ cross stack analysers work behind which of the following principles?

(a) Differential absorption spectroscopy

(b) Gas-filter correlation spectroscopy

(c) Differential absorption & Gas-filter correlation spectroscopy

(d) None of the mentioned

I have been asked this question in an internship interview.

This interesting question is from Air Pollution in division Air Pollution of Environmental Engineering

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The correct answer is (c) Differential absorption & Gas-filter correlation spectroscopy

To explain: Cross stack analysers work behind the principles of differential absorption/gas-filter correlation spectroscopy.

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