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Old 5th Apr 2002, 11:24
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Brenoch
 
Join Date: Oct 2000
Location: Costa del Thames
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As far as I can recall, it measures frequency modulations in the laserbeam beeing sent in a triangular motion between three mirrors.. One IRS incorporates three of theese mirror arrangements to be able to measure the aircrafts movements in all three axes..

Hope it might have shed some light..
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