[Homer-users] Re: bent fiber optic
pietro scatturin
p.scatturin at unipd.it
Tue Jul 24 12:08:49 EDT 2007
Hi Rex,
http://www.specialtyphotonics.com/pdf/products/088_089.pdf , OFS
offer fibers for NIR range with bend radius from 9mm to 29mm core
125 to 400 micron;
http://www.ceramoptec.com/ also .
Some questions ( or suggestions ) :
1. smaller core = smaller bend radius = more difficult coupling to
laser = more leaks;
2. I think that bending the fiber to 90 degrees make sense only you
need to make measurements on occipital region ( OK, this isn't a my problem )
3. There are two ways : a) bend the fibers without leaks : you must
think a connector ( modify existent connectors ? making a custom
connector ? ) to interfacing the scalp skin;
Anyway , look at this link :
http://www.berlin-neuroimaging-center.de/groups/NearInfraredSpectroscopy/lessonnirs2/downloadFile
(12 th. slide)
b) use a 90 deg. prism ( more expensive - more difficult assembly -
mantaining the contact with skin )
I hope for your success. pietro
At 04:39 PM 7/24/2007, you wrote:
>Hi,
>Where could I get optical fibers that could be bent 90 degrees?
>Thanks, Rex
>
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> 07/24/2007 05:14
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>Today's Topics:
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> 1. Optical Fibres suggestions (Christopher Soraghan)
> 2. Re: Optical Fibres suggestions (pietro scatturin)
> 3. RE: Optical Fibres suggestions (Xiaofeng "Steve" Zhang)
> 4. Re: Optical Fibres suggestions (Dennis Hueber)
> 5. fiber NA (Bryan McLaughlin)
>
>
>----------------------------------------------------------------------
>
>Message: 1
>Date: Mon, 18 Jun 2007 10:08:18 +0100
>From: Christopher Soraghan <christopher.j.soraghan at nuim.ie>
>Subject: [Homer-users] Optical Fibres suggestions
>To: "Homer-users at nmr. mgh. harvard. edu"
> <Homer-users at nmr.mgh.harvard.edu>
>Message-ID:
> <ADECLNODFALCEMJJDDODOEDDCFAA.christopher.j.soraghan at nuim.ie>
>Content-Type: text/plain; charset=iso-8859-1
>
>Hi All,
>
>I have a relevant NIRS query but not directly related to HomER.
>
>Can anybody suggest to me the optical fibres used for NIRS including
>company
>name and contact details and any other information you have on them
>(price/specifications)? Any information would be greatly appreciated.
>
>
>
>Many thanks,
>Chris
>
>*********
>
>
>
>
>
>
>------------------------------
>
>Message: 2
>Date: Mon, 18 Jun 2007 12:43:40 +0200
>From: pietro scatturin <p.scatturin at unipd.it>
>Subject: Re: [Homer-users] Optical Fibres suggestions
>To: christopher.j.soraghan at nuim.ie, homer-users at nmr.mgh.harvard.edu
>Message-ID: <6.2.3.4.1.20070618123908.041a97e8 at pop.unipd.it>
>Content-Type: text/plain; charset="us-ascii"; format=flowed
>
>Example :
>http://www.specialtyphotonics.com/pdf/products/088_089.pdf ;
>depends from bending ( 90 deg ) prefered 200 or 400 micron core
>bye pietro
>
>
>At 11:08 AM 6/18/2007, you wrote:
> >Hi All,
> >
> >I have a relevant NIRS query but not directly related to HomER.
> >
> >Can anybody suggest to me the optical fibres used for NIRS including
>company
> >name and contact details and any other information you have on them
> >(price/specifications)? Any information would be greatly appreciated.
> >
> >
> >
> >Many thanks,
> >Chris
> >
> >*********
> >
> >
> >
> >
> >_______________________________________________
> >Homer-users mailing list
> >Homer-users at nmr.mgh.harvard.edu
> >https://mail.nmr.mgh.harvard.edu/mailman/listinfo/homer-users
>
>
>
>------------------------------
>
>Message: 3
>Date: Mon, 18 Jun 2007 09:39:58 -0400
>From: "Xiaofeng \"Steve\" Zhang" <xxz at engr.psu.edu>
>Subject: RE: [Homer-users] Optical Fibres suggestions
>To: <christopher.j.soraghan at nuim.ie>,
> <homer-users at nmr.mgh.harvard.edu>
>Message-ID: <001301c7b1ae$29daa7d0$343e7680 at engr.psu.edu>
>Content-Type: text/plain; charset="us-ascii"
>
>Hi Chris,
>
>Depending on specific applications, people use 65- to 400-micron fibers.
>I'd
>say 400-micron multimode fiber is probably the best to start off with for
>"regular" NIRS. You also need to make sure that the spectrum width of the
>fiber covers your wavelength, i.e. "NIR fiber". Here is a paper that
>details
>what we've been using:
>
>X.Zhang,Y.Toronov,and A.Webb, Integrated measurement system for
>simultaneous
>functional magnetic resonance imaging and diffuse optical tomography in
>human brain mapping, Rev. Sci. Instrum., vol. 77, 114301 (2006)
>
>Hope it helps,
>Steve
>
>-----Original Message-----
>From: homer-users-bounces at nmr.mgh.harvard.edu
>[mailto:homer-users-bounces at nmr.mgh.harvard.edu] On Behalf Of Christopher
>Soraghan
>Sent: Monday, June 18, 2007 5:08 AM
>To: Homer-users at nmr. mgh. harvard. edu
>Subject: [Homer-users] Optical Fibres suggestions
>
>Hi All,
>
>I have a relevant NIRS query but not directly related to HomER.
>
>Can anybody suggest to me the optical fibres used for NIRS including
>company
>name and contact details and any other information you have on them
>(price/specifications)? Any information would be greatly appreciated.
>
>
>
>Many thanks,
>Chris
>
>*********
>
>
>
>
>_______________________________________________
>Homer-users mailing list
>Homer-users at nmr.mgh.harvard.edu
>https://mail.nmr.mgh.harvard.edu/mailman/listinfo/homer-users
>
>
>
>------------------------------
>
>Message: 4
>Date: Mon, 23 Jul 2007 10:07:30 -0500
>From: Dennis Hueber <dmhueber at iss.com>
>Subject: Re: [Homer-users] Optical Fibres suggestions
>To: homer-users at nmr.mgh.harvard.edu
>Cc: christopher.j.soraghan at nuim.ie
>Message-ID: <46A4C432.9090608 at iss.com>
>Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
>
>
>Just a note concerning the ISS instruments and fibers. 200 to 400 micron
>core is best for the sources, because the coupling of the lasers into
>the fiber may be a problem. Also, very small bundles have been used. The
>efficiency is not as good but is consistence. If you are building your
>own instrument and you want to use much smaller and flexible single
>fibers. You could get the lasers coupled by Oz-Optics and use 50 or 62.5
>mircon fiber, which as just about as flexible as single-mode. We have
>done this with prototypes.
>
>About NIRS retransmission. Just about any optical-fiber will work in
>short lengths (a few feet). If you want long fibers pay attention the
>spectrum supplied by the manufacturer. Some transmit NIR better than
>others.
>
>
>Dennis Hueber
>ISS Inc.
>
>
>
>pietro scatturin wrote:
> > Example :
> > http://www.specialtyphotonics.com/pdf/products/088_089.pdf ; depends
> > from bending ( 90 deg ) prefered 200 or 400 micron core
> > bye pietro
> >
> >
> > At 11:08 AM 6/18/2007, you wrote:
> >> Hi All,
> >>
> >> I have a relevant NIRS query but not directly related to HomER.
> >>
> >> Can anybody suggest to me the optical fibres used for NIRS including
> >> company
> >> name and contact details and any other information you have on them
> >> (price/specifications)? Any information would be greatly appreciated.
> >>
> >>
> >>
> >> Many thanks,
> >> Chris
> >>
> >> *********
> >>
> >>
> >>
> >>
> >> _______________________________________________
> >> Homer-users mailing list
> >> Homer-users at nmr.mgh.harvard.edu
> >> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/homer-users
> >
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>
>------------------------------
>
>Message: 5
>Date: Tue, 24 Jul 2007 11:09:35 +0100
>From: "Bryan McLaughlin" <bm304 at cam.ac.uk>
>Subject: [Homer-users] fiber NA
>To: <homer-users at nmr.mgh.harvard.edu>
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