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PANDA Fw Endcap EMC, status prototype Herbert Lhner, Henk Smit, - - PowerPoint PPT Presentation
PANDA Fw Endcap EMC, status prototype Herbert Lhner, Henk Smit, - - PowerPoint PPT Presentation
PANDA Fw Endcap EMC, status prototype Herbert Lhner, Henk Smit, Riemer Bergsma (mech. engineering), Annelie Kluttig (research engineer), KVI Groningen carbon fiber alveoles produced at Fiberworkx BV H. Lhner - PANDA-FwEndcapEMC March
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alveole # NB003 sag progression after loading “crystals” from the back side
Proto NB003, back loaded and glued
0,01 0,02 0,03 0,04 0,05 0,06 21-1-2009 23-1-2009 25-1-2009 27-1-2009 29-1-2009 31-1-2009 2-2-2009 4-2-2009 6-2-2009 8-2-2009 10-2-2009 12-2-2009 14-2-2009 16-2-2009 18-2-2009
Date Displacement (mm)
Left dial guage Middle dial guage Right dial guage
displacement < 0.05 mm during 30 days
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integration DIRC and FwEndcapEMC
light Al frame (540 kg) supported by solenoid, space for digitizing electronics: 16 times 0.4 m2 = in total 6.5 m2 inserts with
alignment crosses foreseen in central hole final decision needed: rectangular / elliptic hole?
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simulation: displacement max. 0.64 mm
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Assembly with alignment crosses
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space for cables and supplies
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stress and temperature sensors
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Fiber Bragg Gratings (FBG)
- C. Doyle, Smart Fibres Ltd. 2003
maximum reflectivity occurs at Bragg wavelength λB with λB = 2 neff Λ
where neff = effective refractive index of mode of propagation in fiber, and Λ = FBG period
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FBG interrogation techniques
time-division multiplexing: TDM
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FBG measurement results
ELECTRONICS LETTERS 6th June 1996 Vol. 32 No. 12
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temperature and strain sensitivity
temperature / strain applied to a Bragg Grating alters the wavelength of reflected light
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fiber embedded in C-fiber composite
Magnified cross section of a laminated carbon fiber panel containing an embedded optical fiber sensor (125 µm diameter):
- ption to embed fiber in alveole composite:
avoid strain sensitivity?
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(WDM)
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(= 1.9 K absolute temp.)
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