Infrared Methods for Gas Detection

It might reasonably be expected that semiconductor devices would inevitably displace thermal devices in all aspects of gas sensing. However, thermal sources and detectors are inexpensive and suffice for a very wide range of gas sensing applications. The advent of thin film sources provided the necessary extended wavelength coverage beyond 4.5 µm compared with glass-envelope filament lamps, and the emitted power is generally higher for thermal sources.

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