OPTI 521 Presentation By Tianquan Su Background Mission Launch Work Fail Failure Further analysis and computer simulation of the WFPC images indicated that 05waverms wavefront spherical aberration at 547nm which could not be eliminated by adjustment ID: 692308
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Slide1
How Hubble Space Telescope failed
OPTI 521 Presentation
By Tianquan SuSlide2
Background
Mission
Launch
Work
FailSlide3
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.Slide4
Where is the problem?
Only spherical
aberration, no coma:
-- probably the primary mirrorSlide5
About the primary mirror
The primary mirror is an aspherical mirror with 2.4m diameter.
It
should have 0.04 wave rms wavefront error at 632.8 nm.Slide6
Why it was misshaped-- wrong testing
Three
measures used in the testing of the primary mirror:
Refractive Null Corrector (
RvNC)
-- whose data showed the mirror flaw that match with the telescope error Reflective Null Corrector (RNC)
-- whose data showed the mirror has no flaw 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 threeSlide7
What is RNC?
RvNC
(refractive
null
corrector)
RNC
(reflective mull
corrector)
RNC
structureSlide8
Testing ChamberSlide9
What’s wrong with it?Slide10
What’s wrong with RNC
The metering rod
(with
the field cap on)Slide11
The initiator of evil
Top view of the field capSlide12
Lesson learned
--
don’t but your eggs in one basket!Slide13
Thank you!