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An optical absorption sensor for gas chromatography (GC) is presented. It consists of a quantum cascade laser along with a long piece of Hollow Waveguide for Infrared (HWIR) transmission inserted into the GC line. It measures the infrared absorption in each individual gas peak after separation by the GC column, and maintains the shapes of gas peaks after the HWIR sensor, making the gas samples further...
Quantum cascade laser is coupled into Hollow Waveguide as an inline sensor after GC separation. We show the sensor has high ppbV sensitivity for carbon and other species, yet maintaining the GC peaks.
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