Engineering topics
Publications and source records attributed to Tratt, D. M..
An intensive 3-day dust devil investigation was conducted near Eloy, Arizona, during June of 2001. The goal was to evaluate strategies for observing dust devils on Mars by studying the physics of terrestrial dust devils.
High power 2.05-mu m Fabry-Perot and distributed feedback (DFB) ridge waveguide lasers fabricated from epitaxially grown InGaAsSb/AlGaAsSb/GaSb and InGaAs/InP hetero-structures are reported.
We provide an overview of the laser absorption spectrometer development that has recently been funded under the Instrument Incubator Program.
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The spectroscopic requirements of the transmitter laser wavelengths for a proposed space-borne laser absorption spectrometer are discussed.
Reported discrepancies in retrieved lidar backscatter measurements are discussed in the context of the relative scattering of consolidated and dispersed targets.
Concurrent measurements of sea-surface retroreflectance and associated wind velocity provide insight into thermal-infrared optical phenomenology of air-sea interface processes.
The coherent Doppler lidar approach for acquiring global profilometry of tropospheric winds from Earth orbit is reliant on off-nadir beam scanning geometry for retrieval of vector winds by Doppler analysis of laser radiation backscattered by entrained aerosols and cloud particles.
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The effects of wind-stress on the optical properties of the ocean surface have been studied for several decades. In particular, the classic study by Cox and Munk (1954) linking sea-surface wind field to wave slope statistics provides a phenomenology by which the sea-surface wind velocity can be estimated from direct measurement of the wave-modulated surface reflectance.
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Using a diffractive eigenmode treatment to model the laser output, we show that graded-reflectance resonator optics offer significant efficiency benefits over conventional hard-edge coupled unstable resonators in the context of coherent detection lidar applications. Extending previous work pertinent to the high equivalent Fresnel number regime, we have modelled the optimum performance of a notional super-Gaussian coupled cavity as a function of the key resonator parameters in the low equivalent Fresnel number regime.
Tropospheric and lower stratospheric aerosol backscatter data obtained from a calibrated backscatter lidar at Pasadena, California (34 deg N latitude)over the 1984-1993 period clearly indicate tightly coupled aerosol optical properties in the upper troposphere and lower stratosphere in the winter and early spring, due to the active mid-latitude stratospheric-tropospheric (ST) exchange processes occurring at this time of year.
The use of airborne CO(sub 2) lidar to obtain cloud backscatter and extinction data at a thermal infrared wavelength is described.