Meaning
A spectroscopic method for gas analysis measures the absorption of infrared light at a wavelength specific to a target molecule. The use of non-dispersive infrared sensors provides a reliable way to monitor carbon dioxide or hydrocarbon concentrations in battery production areas. This technology relies on a narrow-band filter rather than a prism or grating to isolate the required light frequency.
Optical Mechanism
A source emits light through a chamber containing the sample gas and toward a detector. In a non-dispersive infrared system, the amount of light reaching the detector decreases as the concentration of the target gas increases. This relationship follows the Beer-Lambert law, allowing for precise quantification of the gas present.
The filter ensures that only the specific absorption band of the target gas is measured.
Sensor Longevity
The absence of moving parts and chemical reagents makes these devices highly stable over long periods. Because a non-dispersive infrared sensor only detects specific molecular bonds, it is resistant to poisoning from other chemicals. This durability reduces the cost of maintaining safety systems in solvent-heavy environments.
Detection Limit
The path length of the optical cell determines the sensitivity of the instrument. Increasing the distance the light travels allows for the detection of lower concentrations. This configuration is used in leak detection systems for electrolyte breakdown.
