Abstract

A tunable diode laser diagnostic based on spectrally resolved laser absorption has been developed to detect water vapor. The system uses a distributed feedback InGaAsP diode laser, emitting around 1.38 mm. The diode laser is tuned in wavelength by modulating the current, resulting in 1.3 cm.' tuning at 80 Hz repetition rate. Temperatures and concentrations are inferred from the directly measured absorption spectra. The technique has been demonstrated, at low and high temperatures, to detcct the water vapor present in laboratory room air and in the postflame gases above a methane-air flat flame burner. The results agree well with calculated values and independent measurements.

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