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Which of the following detectors are generally used for detection in NO analysis using CO laser?

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Which of the following detectors are generally used for detection in NO analysis using CO laser?

(a) Photomultiplier tube

(b) Photovoltaic cell

(c) Liquid nitrogen cooled Ge-Au element

(d) Photo emissive tube

The question was asked by my school principal while I was bunking the class.

This is a very interesting question from NO2 Analyser topic in division Industrial Gas Analysers of Analytical Instrumentation

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Correct choice is (c) Liquid nitrogen cooled Ge-Au element

For explanation: Liquid nitrogen cooled Ge-Au element is used detection in NO analysis using CO laser. The signal amplitude varied with the concentration of NO.

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