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Optical gyro encoder tested on the NTT

  • The prototype of an optical gyro encoder (OGE) has been successfully tested on the NTT telescope in September '93. The OGE consists of a ring laser gyro and a fiber optic gyro with their input axis parallel. The gyro outptu signals are compensated for earth rotation and misalignment and are subsequently integrated to get the angles. An adaptive digital control loop locks the fiber optic gyro toThe prototype of an optical gyro encoder (OGE) has been successfully tested on the NTT telescope in September '93. The OGE consists of a ring laser gyro and a fiber optic gyro with their input axis parallel. The gyro outptu signals are compensated for earth rotation and misalignment and are subsequently integrated to get the angles. An adaptive digital control loop locks the fiber optic gyro to the laser gyro data. Thus the combined output has the precision of the laser gyro and the low noise of the fiber optic gyro. Specifically, the bias stability is better than 2 X 10-3 deg/h, the scale factor accuracy better than 1 ppm, the random walk coefficient better than 5 X 10-4 deg/(root)h and the resolution better than 3 X 10-4 arcsec. The OGE has been mounted in the altitude and in the azimuthy axis of the telescope. The data were compared with the telescope disk encoder data. The test data show that the pointing accuracy is about 1 arcsec and the tracking accuracy 0.1 arcsec over a time of 30 seconds. This accuracy is sufficient for the very large telescope, for instance.show moreshow less

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Metadaten
Document Type:Conference Proceeding
Conference Type:Konferenzartikel
Zitierlink: https://opus.hs-offenburg.de/8499
Bibliografische Angaben
Title (English):Optical gyro encoder tested on the NTT
Conference:European symposium on optics for environmental and public safety (19-23 June 1995 : Munich, Germany)
Author:Werner SchröderStaff MemberGND, Horst DahlmannStaff MemberGND, B. HuberStaff Member, Lothar SchüsseleStaff MemberGND, H. ZechStaff Member, Martin Ravensbergen
Year of Publication:1995
Creating Corporation:Society of Photo-Optical Instrumentation Engineers
Place of publication:Bellingham, Washington
Publisher:SPIE
Page Number:7
Parent Title (English):Proceedings of SPIE
Editor:Ramon P. DePaula, John W. Berthold III
Volume:2510
ISBN:0819418684
ISSN:0277-786X
DOI:https://doi.org/10.1117/12.221705
Language:English
Inhaltliche Informationen
Institutes:Fakultät Elektrotechnik und Informationstechnik (E+I) (bis 03/2019)
Institutes:Bibliografie
Formale Angaben
Open Access: Closed 
Licence (German):License LogoUrheberrechtlich geschützt