Difference: FocussingLightguide (1 vs. 4)

Revision 4
28 Jul 2006 - Main.KlausFoehl
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META TOPICPARENT name="WebHome"

FocussingLightguide

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-- KlausFoehl - 06 May 2006
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Photos of first Prototypes

Two focussing lightguides still assembled from polishing sandwiched between thin protective plates. Some polishing material has squeezed into the gaps. Disassembly will take place once one has decided one does not want further polishing.

Each acrylic glass lightguide is 50mm thick.

  • Photo 1:
    Photo 1

  • Photo 2:
    Photo 2

  • Photo 2:
    Photo 2

-- KlausFoehl - 28 Jul 2006
  This page is part of DesignItems.

META FILEATTACHMENT attr="" comment="compact focussing lightguide" date="1146864072" name="lightguidex2m54x3m09x4m05.gif" path="lightguidex2m54x3m09x4m05.gif" size="6776" user="KlausFoehl" version="1.1"
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META FILEATTACHMENT attr="" comment="optimised lightguide" date="1152453248" name="fit_proofofconceptc.gif" path="fit_proofofconceptc.gif" size="7010" user="KlausFoehl" version="1.2"
META FILEATTACHMENT attr="" comment="PDF writeup" date="1152452629" name="20060709.lightguide.pdf" path="20060709.lightguide.pdf" size="107527" user="KlausFoehl" version="1.1"
META FILEATTACHMENT attr="" comment="tarball" date="1152452663" name="20060709.lightguide.tar.gz" path="20060709.lightguide.tar.gz" size="282645" user="KlausFoehl" version="1.1"
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META FILEATTACHMENT attr="" comment="Photo 1" date="1154104976" name="img_5488.small.jpg" path="img_5488.small.jpg" size="23327" user="KlausFoehl" version="1.1"
META FILEATTACHMENT attr="" comment="Photo 2" date="1154105009" name="img_5489.small.jpg" path="img_5489.small.jpg" size="18905" user="KlausFoehl" version="1.1"
META FILEATTACHMENT attr="" comment="Photo 2" date="1154105024" name="img_5490.small.jpg" path="img_5490.small.jpg" size="20883" user="KlausFoehl" version="1.1"
 
META TOPICMOVED by="KlausFoehl" date="1146864353" from="Pandacerenkov.DesignItems" to="Pandacerenkov.FocussingLightguide"
Revision 3
09 Jul 2006 - Main.KlausFoehl
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META TOPICPARENT name="WebHome"

FocussingLightguide

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Optimisation routine for lightguide coefficients

optimised lightguide

End of June 2006 I have asked our Edinburgh workshop to build two of the lightguides as shown as dark blue line in the drawing to the right, each will be 50mm thick. Slight changes like a few added holes suggested by the workshop people do not affect the optical focussing.

To obtain the shape I used a macro routine to actually optimise the lightguide shape. Run the macro from within PHYSICA. The optimisation is one iteration only, check the quality in feeding the out values into a second iteration as input values. For the PDF writeup and the tarball with all relevant files please see:

-- KlausFoehl - 09 Jul 2006

Prior write-up

  Some results on the focussing lightguides. Requirements for the two design options below were a focal plane perpendicular to the disc and a high degrees/mm dispersion.
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META FILEATTACHMENT attr="" comment="compact focussing lightguide" date="1146865714" name="lightguidex2m54x3m09x4m05_.gif" path="lightguidex2m54x3m09x4m05_.gif" size="4489" user="KlausFoehl" version="1.1"
META FILEATTACHMENT attr="" comment="compact focussing lightguide with two reflections" date="1146865757" name="lightguidex2m54x3m09x4m05mirror_.gif" path="lightguidex2m54x3m09x4m05mirror_.gif" size="4179" user="KlausFoehl" version="1.1"
META FILEATTACHMENT attr="" comment="possible Barrel end" date="1146922687" name="lightguidex2m50x3m10x4m10.gif" path="lightguidex2m50x3m10x4m10.gif" size="8782" user="KlausFoehl" version="1.1"
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META FILEATTACHMENT attr="" comment="optimised lightguide" date="1152453248" name="fit_proofofconceptc.gif" path="fit_proofofconceptc.gif" size="7010" user="KlausFoehl" version="1.2"
META FILEATTACHMENT attr="" comment="PDF writeup" date="1152452629" name="20060709.lightguide.pdf" path="20060709.lightguide.pdf" size="107527" user="KlausFoehl" version="1.1"
META FILEATTACHMENT attr="" comment="tarball" date="1152452663" name="20060709.lightguide.tar.gz" path="20060709.lightguide.tar.gz" size="282645" user="KlausFoehl" version="1.1"
 
META TOPICMOVED by="KlausFoehl" date="1146864353" from="Pandacerenkov.DesignItems" to="Pandacerenkov.FocussingLightguide"
Revision 2
06 May 2006 - Main.KlausFoehl
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META TOPICPARENT name="WebHome"

FocussingLightguide

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-- KlausFoehl - 05 May 2006
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this page is part of DesignItems.
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I still think that the Barrel can probably be read out with Time-of-Propagation.

But if photon angle measurement is required, the end of the bars could possibly look like this with a focussing lightguide, and maybe one can get away without correcting the fused silica dispersion:
possible Barrel end
I am not happy with the focussing (sigma=0.3-0.5mm, quick hand optimisation only), and the vertical focal plane is not the best orientation either, only a compromise propagated from the Disc calculations above. Getting the focal plane perpendicular to the magnetic field may be necessary, which is good news as best focussing is achieved with somewhere between 60-80degrees and not the 90 degrees. No constraint for the focal plane orientation would be even better news...

-- KlausFoehl - 06 May 2006

This page is part of DesignItems.
 

META FILEATTACHMENT attr="" comment="compact focussing lightguide" date="1146864072" name="lightguidex2m54x3m09x4m05.gif" path="lightguidex2m54x3m09x4m05.gif" size="6776" user="KlausFoehl" version="1.1"
META FILEATTACHMENT attr="" comment="compact focussing lightguide" date="1146864237" name="curvedx2m54x3m09x4m05b.eps" path="curvedx2m54x3m09x4m05b.eps" size="23461" user="KlausFoehl" version="1.1"
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META FILEATTACHMENT attr="" comment="compact focussing lightguide with two reflections" date="1146864553" name="curvedx2m54x3m09x4m05m.eps" path="curvedx2m54x3m09x4m05m.eps" size="11082" user="KlausFoehl" version="1.1"
META FILEATTACHMENT attr="" comment="compact focussing lightguide" date="1146865714" name="lightguidex2m54x3m09x4m05_.gif" path="lightguidex2m54x3m09x4m05_.gif" size="4489" user="KlausFoehl" version="1.1"
META FILEATTACHMENT attr="" comment="compact focussing lightguide with two reflections" date="1146865757" name="lightguidex2m54x3m09x4m05mirror_.gif" path="lightguidex2m54x3m09x4m05mirror_.gif" size="4179" user="KlausFoehl" version="1.1"
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META FILEATTACHMENT attr="" comment="possible Barrel end" date="1146922687" name="lightguidex2m50x3m10x4m10.gif" path="lightguidex2m50x3m10x4m10.gif" size="8782" user="KlausFoehl" version="1.1"
 
META TOPICMOVED by="KlausFoehl" date="1146864353" from="Pandacerenkov.DesignItems" to="Pandacerenkov.FocussingLightguide"
 
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