Gas Leak Detection 4
Gas Leak Detection 4 : Types of Gas Detectors: (3) Infrared Imaging Detectors: Infrared point sensors are active measurement systems, in that they typically measure the absorption of a gas by passing it through a laser-illuminated chamber and measuring the change in transmitted signal. Infrared imaging sensors include both active and passive systems. For active sensing, IR imaging sensors typically scan a laser across the field of view of a scene and look for backscattered light at the absorption line wavelength of a specific target gas. Passive IR imaging sensors, on the other hand, measure spectral changes at each pixel in an image and look for specific spectral signatures which indicate the presence of target gases. The types of compounds which can be imaged are the same as those which can be detected with infrared point detectors
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