Abstract
This work describes a comparison of the performance characteristics between a conventional Fourier transform infrared (FT-IR) and new mid-infrared gas sensors based on diode laser pumped difference frequency generation (DFG) in periodically poled lithium niobate (PPLN) at wavelengths between 3 to 5 microns. Minimum detectable concentrations of trace gases in air at sub ppm levels were obtained using this type of diode laser absorption spectroscopy [1].
© 1998 IEEE
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