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Infrared IR Sensors

Infrared detectors are based on the principle of infrared absorption by gas molecules at specific wavelengths in the infrared region. The Mil-Ram sensor utilizes an infrared lamp source and dual detectors; active and reference. The active detector is covered by an optical filter that allows transmission of infrared radiation at a specified wavelength where the target gas is known to absorb. The reference element is covered by a filter that transmits wavelengths outside the absorption band. This arrangement provides compensation for normal changes in lamp intensity over time. The infrared detector can be supplied for hydrocarbon (LEL) or carbon dioxide measurement. Unlike catalytic sensors for hydrocarbon detection, the infrared sensor is unaffected by catalytic inhibitors and poisons.