Engineering topics
Gaiser, S. L.
Publications and source records attributed to Gaiser, S. L..
Atmospheric sounding at JPL: current and future technologies
We discuss lessons learned on AIRS in the development and operations as well as plans for next generation systems including SIRAS, a wide field hyperspectral infrared imaging spectrometer which offers AIRS spectral performance at 24x the spatial resolution.
AIRS in-orbit infrared calibration performance
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Early calibration results from the Atmospheric Infrared Sounder (AIRS) on Aqua
This paper summarizes the AIRS instrument radiometric, spatial, and spectral performance as measured in orbit during the A&E phase. Instrument noise performance, spectral alignment dependence on temperature and other factors, and spatial pointing accuracy are discussed.
On-board calibration techniques and test results for the Atmospheric Infrared Sounder (AIRS)
The Atmospheric Infrared Sounder (AIRS) is a space based instrument developed for measurement of global atmospheric properties; primarily water vapor and temperature. The on-board calibration subsystems are described along with a description of special test procedures for using them and results from several tests performed to date.
Extrasolar planet detection
This paper discusses the concept of extrasolar planet detection using a large-aperture infared imaging telescope. Coronagraphic stellar apodization techniques are less efficient at infrared wavelengths compared to the visible, as a result of practical limitations on aperture dimensions, thus necessitating additional starlight suppression to make planet detection feasible in this spectral domain. We have been investigating the use of rotational shearing interferometry to provide up to three orders of magnitude of starlight suppression over broad spectral bandwidths. We present a theoretical analysis of the system performance requirements needed to make this a viable instrument for planet detection, including specifications on the interferometer design and telescope aperture characteristics. The concept of using rotational shearing interferometry as a wavefront error detector, thus providing a signal that can be used to adaptively correct the wavefront, will be discussed. We also present the status of laboratory studies of on-axis source suppression using a recently constructed rotational shearing interferometer that currently operates in the visible.
Photometry of occultation candidate stars. II - Uranus 1985-1990 and Saturn 1986-1991
K magnitudes are given for seven Uranus-occulted stars, together with V and I magnitudes for 20 stars that will be occulted by the Uranian rings in 1986-1990 and 15 that will be occulted by the rings of Saturn in the course of 1986-1991. Occultation stars are noted to be up to 1 mag brighter in the K bandpass than could be predicted on the basis of V-I colors alone; this is explainable in terms of typical degrees of interstellar reddening.