What is an NDIR gas analyzer?
Non-dispersive infrared (NDIR) analyzers employ the use of specialized sensors to measure gas concentrations in the surrounding atmosphere. This overview from Nova Analytical Systems outlines how they work, what gases they measure, and why they are essential for many industrial applications.
How does NDIR detector work?
When infrared radiation interacts with gas molecules, infrared light is absorbed by the gas molecules at a particular wavelength, causing vibration of the gas molecules. NDIR (Non-Dispersive Infrared) gas sensors detect decrease in transmitted infrared light which is in proportion to gas concentration.
What is NDIR spectroscopy?
Nondispersive infrared (NDIR) spectroscopy is often used to detect gas and measure the concentration of carbon oxides (for example, carbon monoxide and carbon dioxide). An infrared beam passes through the sampling chamber, and each gas component in the sample absorbs some particular frequency of infrared.
What is the working principle of gas analyzer?
An infrared gas analyzer measures trace gases by determining the absorption of an emitted infrared light source through a certain air sample. Trace gases found in the Earth’s atmosphere become excited under specific wavelengths found in the infrared range.
Can CO2 absorb infrared radiation?
Carbon dioxide acts as a sort of gatekeeper: it allows visible light to pass right by but will absorb infrared (heat) energy.
How does a Pellistor work?
The catalytic pellistor as used in the catalytic bead sensor works by burning the target gas; the heat generated producing a change in the resistance of the detecting element of the sensor proportional to the gas concentration.
How is CO2 gas measured?
Carbon Dioxide (CO2) is measured with a gas sensor specifically made to measure the concentration of carbon dioxide (CO2) in the air. There are three main types of Carbon Dioxide (CO2) sensors: Electrochemical sensors, Non-Dispersive Infrared (NDIR) Sensors, and Metal Oxide Semiconductor (MOS) Sensors.
Which gas absorbs infrared?
carbon dioxide
Water vapor, carbon dioxide, methane, and other trace gases in Earth’s atmosphere absorb the longer wavelengths of outgoing infrared radiation from Earth’s surface.
What blocks infrared light?
Any electrically conductive material will block IR. The greater the conductivity, the greater the blocking. Aluminum foil will kill all IR, bot high range and low. Most plastics allow IR to pass through.
