BIOMEDICAL ARTICLES
Application of the small-angle approximation to ocean water types.
The small-angle approximation to the radiative transport equation is applied to particle suspensions that emulate ocean water. A particle size distribution is constructed from polystyrene and glass spheres with the best available data for particle size distributions in the ocean. A volume scattering function […]
Internal, near-surface, and scattered electromagnetic fields for a layered spheroid with arbitrary illumination.
A spheroidal coordinate separation-of-variables solution has been developed for the determination of internal, near-surface, and scattered electromagnetic fields of a layered spheroid (either prolate or oblate) with arbitrary monochromatic illumination (e.g., plane wave or focused Gaussian beam). Calculated results are […]
Spatial distribution of fluorescence intensity within large droplets and its dependence on dye concentration.
The dependence of fluorescence intensity distributions within droplets on added dye concentration has been calculated by extension of the geometrical-optics approximation and verified by experimental observations. With rising dye concentration, surface plots of the equatorial fluorescence pattern show decreasing […]
Optical remote sensing of chlorophyll a in case 2 waters by use of an adaptive two-band algorithm with optimal error properties.
Two-band algorithms that use the ratio of reflectances at 672 and 704 nm have already proved successful for chlorophyll a retrieval in a range of coastal and inland waters. An analysis of […]
Possibility of Hard-Target Lidar Detection of a Biogenic Volatile Organic Compound, nu-Pinene Gas, Over Forest Areas.
The absorption spectrum of alpha-pinene gas, a biogenic volatile organic compound, was directly measured with a pulsed mid-infrared laser. The maximum absorption wavelength was found to be ~3.42 mum, and an absorption cross section of 4.8 x […]
Airborne Lidar LEANDRE II for Water-Vapor Profiling in the Troposphere. I. System description.
The airborne differential absorption lidar LEANDRE II, developed for profiling tropospheric water-vapor mixing ratios, is described. The emitter is a flash-lamp-pumped alexandrite laser, which operates in a double-pulse, dual-wavelength mode in the 727-736 nm spectral domain. Two 50-mJ successive on-line […]
Adaptive-optics compensation by distributed beacons for non-kolmogorov turbulence.
In optical propagation through atmospheric turbulence, the performance of compensation with adaptive optics depends on a beacon\’s spatial distribution. With distributed beacons, the inefficiency of the modal correction, which is defined as the ratio of the anisoplanatic error of the jth mode and the Zernike-coefficient […]
Determination by spaceborne backscatter lidar of the structural parameters of atmospheric scattering layers.
Spaceborne active lidar systems are under development to give new insight into the vertical distribution of clouds and aerosols in the atmosphere and to provide new information on variables required for improvement of forecast models and for understanding the radiative […]
Fiber-based lidar for atmospheric water-vapor measurements.
The design and evaluation of a prototype fiber-based lidar system for autonomous measurement of atmospheric water vapor are presented. The system components are described, along with current limitations and options for improvement. Atmospheric measurements show good agreement with modeled signal returns from 400 to 1000 m but […]
Effects of overmodulation in fixation-free rehalogenating bleached holograms.
The mechanism for hologram formation by fixation-free rehalogenating bleaching has been treated by several authors. Experiments carried out with Kodak and Agfa photographic plates have led to the conclusion that the transfer of material from the exposed to the unexposed zones is the main mechanism […]
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