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What does the abbreviation NDIR stand for, in the category of spectrometric analysers?

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What does the abbreviation NDIR stand for, in the category of spectrometric analysers?

(a) Non-Destructive Integrated Restoration

(b) Neo-Destructive Integrated Radiation

(c) Non-Dispersive Infrared

(d) Neo-Dispersive Integrated Radiation

The question was posed to me during a job interview.

Question is taken from Air Pollution topic in division Air Pollution of Environmental Engineering

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Right option is (c) Non-Dispersive Infrared

Best explanation: NDIR detectors/analysers are used to monitor sulphur dioxide, oxides of nitrogen and carbon, hydrocarbons, etc.

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