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Diode laser instrumentation for aeropropulsion applications

33rd Aerospace Sciences Meeting and Exhibit
1995
  • 8
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  • 3
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Conference Paper Description

This paper reports results on the progress of development of aeropropulsion sensors based on visible and near-IR diode laser absorption. Using a balanced ratiometric detection technique, compact sensor architectures are demonstrated which allow sensitive measurements of aerodynamic and combustion species without resort to frequency/wavelength modulation techniques or custom-fabricated laser wavelengths. Using widely available, broadly tunable InGaAsP diode lasers near 1.3 1 μm, simultaneous water density and temperature measurements are demonstrated in fiber-coupled, wavelength multiplexed configurations with a limiting density sensitivity of 10cm in a 50 cm path and an rms standard deviation of 42 K over a range from 300 K to 1300 K. Initial results suggest the possibility of extending this temperature range to 1900 K and above using other line pairs. Using visible diode lasers at 638 nm or 670 nm, an NO emissions sensor concept is demonstrated with sub-ppm detectivity in a 1 m path.

Bibliographic Details

M. G. Allen; S. J. Davis; W. J. Kessler; D. A. Palombo; D. M. Sonnenfroh

American Institute of Aeronautics and Astronautics (AIAA)

Earth and Planetary Sciences; Engineering

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