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From course:

Commonly Used Sensors

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Question:

5. At the detector end the remaining light hits an optical filter that absorbs every wavelength of light except the target wavelength (e.g. 4.2 micron for CO2). 6. Finally, an IR detector reads the remaining amount of light that was not absorbed by the CO2 molecules or the optical filter. 7. The higher the concentration of absorbing gas the lower the amount of light detected

Author: Smiling Bandicoot



Answer:

Nondispersive Infrared (NDIR)


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