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Hi Xiaochao,<br>
<br>
Fusing fibers has become a very matured process for its simple
setup, easy procedure and good performance. We used this technique
to fabricate the GlueX's microscope hodoscope and fused short saqure
2x2mm2 scintillator fibers with transparent long fibers. Forwarded
are some information I got from my colleague at UConn who's building
the microscope and hope they are useful to you. Let me know if you
have any questions.<br>
<br>
Cheers,<br>
Yi<br>
<div class="moz-forward-container"><br>
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">Subject:
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<td>Re: Fiber Fuser</td>
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">Date: </th>
<td>Mon, 7 Apr 2014 13:29:03 -0400</td>
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">From: </th>
<td>James McIntyre <a class="moz-txt-link-rfc2396E" href="mailto:mcintyre.james.m@gmail.com"><mcintyre.james.m@gmail.com></a></td>
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">To: </th>
<td>Yi Qiang <a class="moz-txt-link-rfc2396E" href="mailto:yqiang@jlab.org"><yqiang@jlab.org></a></td>
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<br>
<br>
<div dir="ltr">
<div class="gmail_default" style="font-family:tahoma,sans-serif">Meant
to attach these for you to reference. <br>
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<div class="gmail_extra"><br>
<br>
<div class="gmail_quote">On Mon, Apr 7, 2014 at 1:23 PM, James
McIntyre <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:mcintyre.james.m@gmail.com" target="_blank">mcintyre.james.m@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">
<div class="gmail_default"
style="font-family:tahoma,sans-serif">Hi Yi,<br>
<br>
</div>
<div class="gmail_default"
style="font-family:tahoma,sans-serif">
The fusing unit was made by Michigan State University
(on loan from Ron Richards, I believe?). The unit
wouldn't be too difficult to make (I think). It's
basically a couple of pneumatic pistons which automate
the process and a projector bulb for a light source.
The thing that cost the most is the quartz ferrules
which help keep alignment and fiber shape during
fusing. If I recall correctly it was around $2k for 16
ferrule halves (8 complete sets). It will be much
cheaper for round fibers.<br>
<br>
</div>
<div class="gmail_default"
style="font-family:tahoma,sans-serif">The fusing process
if fairly easy, once the unit is setup. We test every
10th fusing by fusing scrap fibers (shorter spare
fibers) together and laying it on a two point support
(supports separated by ~ 1 inch) and then hanging a
weight at the fuse sight which is in the center of the
two supports (see slide 5 of the attached PowerPoint).
We ensure that it holds at least 800 grams. At times we
have increased the weight up to 1300 grams before
breaking. This is for a 2mm square fiber.<br>
<br>
</div>
<div class="gmail_default"
style="font-family:tahoma,sans-serif">Compared to gluing
it is like night and day! We used BC-600 epoxy and often
broke the fused joint just by light pressure or dropping
it 3 to 4 inches on to a table (this would never happen
to a fused fiber). For smaller fiber, especially round
ones, fusing is the best option! <br>
<br>
</div>
<div class="gmail_default"
style="font-family:tahoma,sans-serif">As for light loss
... we are still determining the numbers. I'll get back
to you on that. But as far as visually, you cannot tell
the difference. One thing to note is that when gluing
we found that there was much more light loss at the
fuse/gluing sight than we have seen with the fused
fibers. The reason being is that when you glue, the
epoxy manufacturer recommends a certain gap (glue
thickness) between the fibers being glued, but fusing
leaves no gap and keeps the cladding continuous along
the outside (if fused properly) . Shining a laser down
through the fiber we noticed a significant amount of
light loss at the gluing joint, especially if some of
the glue had been sanded down because of overflow (often
the case).<br>
<br>
</div>
<div class="gmail_default"
style="font-family:tahoma,sans-serif">What size fibers
are you looking to fuse and are they round or square?
Let me know if I can help in any way.<br>
<br>
</div>
<div class="gmail_default"
style="font-family:tahoma,sans-serif">
Cheers,<br>
</div>
<div class="gmail_default"
style="font-family:tahoma,sans-serif">Jim<br>
</div>
</div>
<div class="HOEnZb">
<div class="h5">
<div class="gmail_extra"><br>
<br>
<div class="gmail_quote">On Mon, Apr 7, 2014 at 11:42
AM, Yi Qiang <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:yqiang@jlab.org" target="_blank">yqiang@jlab.org</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000"> Hi James,<br>
<br>
We are evaluating different options to readout
signals from the preshower for the SoLID
Spectrometer. Fusing clear fibers with wave
length shifting fibers seem very promising to
us. So I was trying to find more information
about the fuser you used for the microscope at
UConn. The information is kind of scattered in
different talks in DocDB, but I still couldn't
find much details about your setup. Here are a
few questions about the fusing setup:<br>
1. Is the fusing station home made? how much
does that cost?<br>
2. What is the light lose in the fused joint?
(compared to glue?)<br>
3. How strong is the joint?<br>
<br>
Thanks!<span><font color="#888888"><br>
Yi<br>
<br>
<div>-- <br>
<div>
<div> <span
style="font-size:14pt;color:#202020"><strong>Yi
Qiang</strong></span> <span
style="font-size:12pt;color:#404040">Ph.D. <em>Staff
Scientist</em></span><br>
<span
style="font-size:10pt;color:#404040"><strong>Email</strong>:
<a moz-do-not-send="true"
href="mailto:yqiang@jlab.org"
target="_blank">yqiang@jlab.org</a><br>
<strong>Tel</strong>: <a
moz-do-not-send="true"
href="tel:%28757%29%20269-7237"
value="+17572697237"
target="_blank">(757) 269-7237</a> <strong>Fax</strong>:
<a moz-do-not-send="true"
href="tel:%28757%29%20269-6331"
value="+17572696331"
target="_blank">(757) 269-6331</a><br>
<strong>Web</strong>: <a
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href="https://userweb.jlab.org/%7Eyqiang/"
target="_blank">https://userweb.jlab.org/~yqiang</a><br>
12000 Jefferson Ave F351, Newport
News, VA 23606<br>
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</font></span></div>
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