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VCSEL-based laser hygrometer using rapidly time division multiplexed direct absorption and wavelength modulation spectroscopy

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Abstract

A newly developed spectroscopic modulation scheme enables absolute gas concentration measurements with enhanced precision and dynamic range by time multiplexing calibration-free direct tunable diode laser absorption (dTDLAS) and wavelength modulation spectroscopy (WMS).

© 2014 Optical Society of America

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