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  • 1
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    Wavefront error sensing for LDR (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Wavefront sensing is a significant aspect of the LDR control problem and requires attention at an early stage of the control system definition and design. A combination of a Hartmann test for wavefront slope measurement and an interference test for piston errors of the segments was examined and is presented as a point of departure for further discussion. The assumption is made that the wavefront sensor will be used for initial alignment and periodic alignment checks but that it will not be used during scientific observations. The Hartmann test and the interferometric test are briefly examined.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Report of the Asilomar 3 LDR Workshop; p 58-59
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    An adaptive interpolator algorithm for area-array fine guiance sensors (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The present paper provides a description of recent and continuing work related to the development of tracking systems possessing artificial intelligence. It is pointed out that artificial intelligence is being used to provide trackers with the abilities to sense environmental changes which can affect tracker performance, to optimize tracker performance in a changing environment, and to report on the accuracy and stability of the pointing data. The implementation of artificial intelligence in tracking systems is based on the use of adaptive algorithms which correct for tracking errors by applying polynomial corrections to raw tracking output data. The basic operation of a centroid tracking system is discussed, taking into account the limitations on accuracy and stability which exist in the absence of intelligence. Attention is given to the correction method and the implementation of artificial intelligence to improve tracking.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: text
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  • 3
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    ASTROS - A sub-arcsec CCD star tracker (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The design and application of ASTROS (Advanced Star and Target Reference Optical Sensor) are described, with emphasis on performance test results acquired with a prototype system. The ASTROS tracker provides extremely precise measurements of star image coordinates as inputs to the Image Motion Compensation (IMC) system used to stabilize the science instrument focal planes. Performance levels achieved are dramatic improvements over the levels achieved with image dissector designs with comparable fields of view.
    Keywords: SPACECRAFT INSTRUMENTATION
    Format: text
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  • 4
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    Centroid tracking with area array detectors (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A computer program (ALGEVAL) has been developed to simulate the position estimating behavior of a centroid estimator algorithm using data typical of optical point spread function data recorded by an area array detector. Typical results are shown of varying detector properties and optical point spread function types. The detector parameters currently available for study include read noise mean value, dark current mean value and spatial variation, charge transfer efficiency and point spread function location, saturation level, signal level and pixel size. The program is capable of calculating any order centroid using an array size from 2 x 2 to 15 x 15 pixels. The output of the program is either a performance map, histogram data or tabluar data. A number of further developments are recommended.
    Keywords: OPTICS
    Type: NASA-CR-179750 , JPL-PUB-86-21 , NAS 1.26:179750
    Format: application/pdf
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  • 5
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    Imaging System For High-Temperature Processes (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Borescope/camera arrangement used for viewing silhouette image of specimen levitated inside furnance. System adapted for monitoring other processes in enclosures.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-15945 , NASA Tech Briefs (ISSN 0145-319X); 8; 4; P. 478
    Format: text
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  • 6
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    Monitoring Acoustically Levitated Samples (1984)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Physical behavior of sample acoustically levitated in high-temperature oven optically monitored by new system. Optical system allows visible and infrared monitoring of sample.
    Keywords: FABRICATION TECHNOLOGY
    Type: NPO-15193 , NASA Tech Briefs (ISSN 0145-319X); 8; 2; P. 291
    Format: text
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  • 7
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    Development of a Shuttle Infrared Telescope Facility /SIRTF/ fine guidance sensor (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Fine guidance technology development for the Shuttle Infrared Telescope Facility (SIRTF) centers upon the use of a single multiple-star-tracking sensor to provide the position information necessary to produce three-axis attitude control signals for precision payload pointing. The effort described in this paper is concerned with the development of a fine guidance sensor that employs a high-density charge-coupled imaging device for producing position information signals by using star fields. Multiple star position information produces three-axis position error signals that are used to update inertial reference gyros. The sensor employs advanced position interpolation algorithms to enhance field-of-view resolution and to correct for optical aberrations inherent in spatially chopped star images resulting from the telescope's movable secondary mirror. Operation of the sensor is under the control of a high-performance microcomputer that provides both autonomy and flexibility in a guidance application.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: Seminar on Shuttle pointing of electro-optical experiments; Feb 10, 1981 - Feb 13, 1981; Los Angeles, CA
    Format: text
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  • 8
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    Radiometric and photometric design for an Acoustic Containerless Experiment System (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The design of an optical system for a high temperature Acoustic Containerless Experiment System is examined. The optical system provides two-axis video, cine and infrared images of an acoustically positioned sample over a temperature range of 20 to 1200 C. Emphasis is placed on the radiometric and photometric characterization of the elements in the optical system and the oven to assist image data determination. Sample visibility due to wall radiance is investigated along with visibility due to strobe radiance. The optical system is designed for operation in Spacelab, and is used for a variety of materials processing experiments.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: AIAA PAPER 81-0164 , Aerospace Sciences Meeting; Jan 12, 1981 - Jan 15, 1981; St. Louis, MO
    Format: text
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