how hubble space telescope failed
DESCRIPTION
OPTI 521 Presentation By Tianquan Su. How Hubble Space Telescope failed. Background . Failure. Where is the problem?. About the primary mirror. Why it was misshaped -- wrong testing. What is RNC?. Testing Chamber. What’s wrong with it?. What’s wrong with RNC. The initiator of evil. - PowerPoint PPT PresentationTRANSCRIPT
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HOW HUBBLE SPACE
TELESCOPE FAILED
OPTI 521 Presentation By Tianquan Su
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Background
Mission Launch
Work Fail
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Failure
Further analysis and computer simulation of the WF/PC images indicated that 0.5-waverms wavefront spherical aberration at 547nm, which could not be eliminated by adjustment.
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Where is the problem?Only spherical aberration, no coma:-- probably the primary mirror
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About the primary mirrorThe primary mirror is an aspherical mirror with 2.4m diameter. It should have 0.04 wave rms wavefront error at 632.8 nm.
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Why it was misshaped-- wrong testing
Three measures used in the testing of the primary mirror:o Refractive Null Corrector (RvNC) -- whose data showed the mirror flaw that match with the telescope error o Reflective Null Corrector (RNC) -- whose data showed the mirror has no flaw o Inverse Null Corrector (test the RvNC by stimulate the mirror) -- whose data also showed aberration
Funny thing is the manufacturer, Perkin-Elmer Corporation (P-E), trusted the only black sheep of the three
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What is RNC?
RvNC (refractive null corrector)
RNC (reflective mull corrector)
RNC structure
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Testing Chamber
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What’s wrong with it?
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What’s wrong with RNC
The metering rod (with the field cap on)
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The initiator of evil
Top view of the field cap
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Lesson learned-- don’t but your eggs in one basket!
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Thank you!