Interferometric encoder techniques: Final report, September 29, 1986-January 15, 1988
Photon and particle beam pointing systems depend for accuracy on the integrity of a mechanical structure that supports its key components. Minute bending and deformations of mechanical structures introduce angular errors into the pointing process that cannot easily be removed. To maintain pointing accuracies of a system in the tens of nanoradians, bending and deformation of a mechanical structure must be kept under control. There is no current technology that can perform these angular measurements that satisfy the envisioned requirements on angular resolution, total angular dynamic range and angular velocity. The present contract was used to develop the required technology in response to the envisioned requirements in this area of the Strategic Defense Initiative. As will be shown in this report, the measurement techniques that are developed may equally be applied to measure either linear or angular translations. The most frequently adopted approach in non-contact distance measurement (either linear or rotary) utilizes 2 readout stations (gates) that are positioned along a periodic structure (optical, magnetic, etc.) so that they are in phase quadrature with respect to one another. Either the periodic structure or the dual gate assembly moves with respect to the other. During translation the 2 gates produce 2 periodic signals, which are 90/sup 0/ out of phase, and allow determination of travel direction in addition to measurement (in terms of number of periods of the periodic structure) of the distance traveled.
- Research Organization:
- Rockwell International Corp., Canoga Park, CA (USA). Rocketdyne Div.
- DOE Contract Number:
- AC03-86SF16499
- OSTI ID:
- 5408552
- Report Number(s):
- DOE/SF/16499-T3; RI/RD-88-106; ON: DE88004696
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BALLISTIC MISSILE DEFENSE
INTERFEROMETRY
CONTROL SYSTEMS
ERRORS
FLOWSHEETS
GRATINGS
MEASURING METHODS
MECHANICAL STRUCTURES
PROGRESS REPORT
RESEARCH PROGRAMS
SIMULATION
SPATIAL RESOLUTION
DIAGRAMS
DOCUMENT TYPES
NATIONAL DEFENSE
RESOLUTION
440300* - Miscellaneous Instruments- (-1989)