Definition

NDIR stands for Non-Dispersive Infrared, which is a method of gas analysis used to measure the concentration of specific gases in a sample. This technique relies on the absorption of infrared light at specific wavelengths by the molecules of the target gas. In an NDIR gas analyzer, an infrared light source emits a beam of light through the gas sample, and a detector measures the intensity of the light after it has passed through the sample. The degree of absorption of infrared light is proportional to the concentration of the target gas, allowing for accurate and selective gas concentration measurements. NDIR is commonly used in various applications, including environmental monitoring, industrial gas analysis, and indoor air quality measurement.