Infrared element analyzer is based on what principle of analysis

Various polar molecular gases such as SO2, CO2, and H2O gas have absorption effects on infrared light, while diatomic molecular gases such as H2, O2, and N2 do not absorb. The absorption of infrared light by gas follows the Lambert-Beer law, ie:

I=I0e—KLC

Where: I0 - the initial energy of infrared light;

I - the energy of infrared light absorbed by the gas;

K - the constant associated with the gas;

L - the optical path, ie the thickness of the infrared light through the gas layer;

C—the concentration of the gas to be measured.

The law shows that the size of the absorption is directly related to the nature of the gas, the optical path and the gas concentration.

Different gas molecules have different infrared absorption characteristic wavelengths, for example, in the range of 2 to 14.5 μm, SO2 absorption peaks at 4.0 μm and 7.35 μm, and CO2 absorption peaks at 2.78 μm, 4.28 μm, and 14.3 μm. The selective absorption of infrared light by gas molecules and Beer's law are the basis of infrared gas analysis.

The infrared detection pool is one of the key components. It is generally composed of an infrared light source, a cutting motor and a light cutting sheet, an analysis chamber, a precision filter, a detection element, and a preamplifier.