Sensors for Pointing Moving Instruments Toward Each Other

TBMG-124

01/01/2005

Abstract
Content

Optoelectronic sensor systems are being developed for use in maintaining fixed relative orientations of two scientific- instrument platforms that are in relative motion. In the original intended application, the platforms would be two spacecraft flying in formation and separated by a long baseline. In principle, sensor systems of this type could also be used in terrestrial applications for maintaining alignments between moving instrument platforms. The sensor system would utilize beacon laser beams that would be transmitted by the platforms in the normal course of scientific measurements. The frequency of the returned laser beam would differ by about 5 MHz. On each platform, the transmitted laser beam and the laser beam bounced off the other platform would be focused onto a quadrant photodetector, where the interference between the laser beams would give rise to sinusoidal (beat-frequency) signals on all four quadrants. The differences among the phases of the beat-frequency signals in the quadrants would depend on, and would be used to determine the angle between, the wave fronts of the outgoing and incoming laser beams.

Meta TagsDetails
Citation
"Sensors for Pointing Moving Instruments Toward Each Other," Mobility Engineering, January 1, 2005.
Additional Details
Publisher
Published
Jan 1, 2005
Product Code
TBMG-124
Content Type
Magazine Article
Language
English