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Which of the following is used as a source in the simple infrared analyzer for gas analysis?

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Which of the following is used as a source in the simple infrared analyzer for gas analysis?

(a) Tungsten filament lamp

(b) Nernst glower

(c) Hot-wire spiral

(d) Mercury arc lamp

I had been asked this question during an internship interview.

Question is from Infrared Gas Analysers topic in portion Industrial Gas Analysers of Analytical Instrumentation

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Right answer is (c) Hot-wire spiral

Easiest explanation: Hot-wire spiral is used as a source in the simple infrared analyzer for gas analysis. Two sources are used.

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