Method for extending usage life span of infrared light sources for non-dispersive infrared (NDIR) gas sensing technology

摘要

A method for extending a usage life span of infrared light sources for non-dispersive infrared (NDIR) gas sensing technology is applied for a gas detector. The method includes an intermittent measure of lighting up the light and an electric current control measure. The intermittent measure can alternatively light up the infrared light sources to make the infrared light sources work in turn. The electric current control measure is to detect voltages dropped one the infrared light sources and then to control an electric current capacity of a variable current source flowing to the infrared light sources in accordance with the detecting results, so as to fix a radiant power of the infrared light sources. Hence the two infrared lights sources can share usage loading to provide the stable radiant power to achieve an objective of extending the usage life span of the infrared light sources.