Single Diode Laser Sensor for Wide-Range H2O Temperature Measurements

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Abstract:

A single diode laser absorption sensor (near 1477 nm) useful for simultaneous temperature and H2O concentration measurements is developed. The diode laser tunes approximately 1.2 cm-1 over three H2O absorption transitions in each measurement. The line strengths of the transitions are measured over a temperature range from 468 to 977 K, based on high-resolution absorption measurements in a heated static cell. The results indicate that the selected transitions are suitable for sensitive temperature measurements in atmospheric pressure combustion systems using absorption line ratios. Comparing the results with HITRAN 96 data, it appears that these transitions will be sensitive over a wide range of temperatures (450-2000 K), suggesting applicability for combustion measurements.

Keywords: COMBUSTION DIAGNOSTICS; H2O MEASUREMENT; TEMPERATURE MEASUREMENT; TUNABLE DIODE LASER ABSORPTION SPECTROSCOPY

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370204773580338

Affiliations: Department of Mechanical Engineering, University of Maryland, College Park, Maryland 20742

Publication date: April 1, 2004

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