Vocabulary concept

Concept URI		http://dd.eionet.europa.eu/vocabulary/aq/measurementmethod/NDIR
Identifier
Label
Definition		A nondispersive infrared sensor (or NDIR) sensor is a simple spectroscopic device often used as gas detector. The main components are an infrared source (lamp), a sample chamber or light tube, a wavelength sample chamber, and gas concentration is measured electro-optically by its absorption of a specific wavelength in the infrared (IR). The IR light is directed through the sample chamber towards the detector. In parallel there is another chamber with an enclosed reference gas, typically nitrogen. The detector has an optical filter in front of it that eliminates all light except the wavelength that the selected gas molecules can absorb.
Notation
Status
Status Modified
Accepted Date
Not Accepted Date
Scope note		Add new
Editorial note		Add new