Hi Justin,
We don't really do any optical modelling in house since most of our
optics are designed externally.
Thanks,
Cordell
On 5/11/2015 3:50 PM, Justin Albert wrote:
> *** Discussion title: ALTAIR Nanosat (STARCaL)
>
> Hi John, and Houman and Cordell,
>
> These are excellent points! Houman & Cordell, might there possibly be any
> way that the ring of LEDs (and its PCB) could be made with a slightly
> larger diameter, and/or more flush with the sphere, to significantly
> reduce any light scattering, before we definitely need to move to a a
> larger sphere and larger satellite bus? Also, might UTIAS-SFL happen to
> use ZEMAX or Code V or similar for optical modelling?
>
> Thanks very much all!!!
> justin
>
> On Mon, 11 May 2015, Woodward IV, John T. wrote:
>> Hi Justin-
>> My apologies for not keeping up with the discussions, so some of what I say below may have been discussed.
>> I agree with Arnold that the cone and PCB will scatter light - in general it is best to have as little as possible between the emitting aperture and the observer.
>> It is hard to tell from the drawings, but the PCB looks like it could catch a lot of light. It would be worth a modeling effort if it hasn't been done.
>> Thanks,
>> John
>>
>> -----Original Message-----
>> From: Justin Albert [mailto:jalbert@uvic.ca]
>> Sent: Friday, May 08, 2015 1:59 PM
>> To: nanosat-hn-pa@projectaltair.org
>> Subject: RE: [ALTAIR] - some images (fwd)
>>
>>
>> *** Discussion title: ALTAIR Nanosat (STARCaL)
>>
>> Houman and Cordell -- extremely good points from Arnold below.
>>
>> BTW, Arnold, you did the exactly right thing in cc'ing nanosat-hn-pa@projectaltair.org , so it should have ended up posted there, but it didn't! Did you get a bounce-back message by any chance, or did that cc just disappear?
>>
>> On Fri, 8 May 2015, Gaertner, Arnold wrote:
>>> Hi Justin and Houman,
>>> Thanks for forwarding the links.
>>> The design looks interesting.
>>> I have one comment:
>>> The integrating sphere will emit light in all directions, not only in the cone direction for which we provide unobstructed view of the sphere port.
>>> Be careful that none, or as little as possible (within the uncertainty we require), of the light that is emitted outside this angle and hits the PCB, or even the cone walls, does not get scattered back into the direction of our view.
>>> The cone black is never really black, and if it gets dust on it will become a 'diffuse' scatterer.
>>> The edges of the PCB will scatter.
>>> Best regards,
>>> Arnold
>>>
>>> -----Original Message-----
>>> From: Justin Albert [mailto:jalbert@uvic.ca]
>>> Sent: Thursday, May 07, 2015 23:24
>>> To: nanosat-hn-pa@projectaltair.org
>>> Subject: [ALTAIR] - some images (fwd)
>>>
>>>
>>> *** Discussion title: ALTAIR Nanosat (STARCaL)
>>>
>>> At the bottom of this message are links to the drawings from Houman (solid model renderings of the optical payload) which we discussed during today's telecon.
>>>
>>> ---------- Forwarded message ----------
>>> Date: Thu, 07 May 2015 13:03:33 -0400
>>> From: Houman Hakima <hhakima@utias-sfl.net>
>>> To: jalbert@uvic.ca, Cordell Grant <cgrant@utias-sfl.net>
>>> Subject: [ALTAIR] - some images
>>>
>>> Hi Justin,
>>>
>>> Here are some images reflecting the changes that I have made since last telecon. The most significant one would be the PCB that is mounted around the output port and has 6 LEDs on it. I made sure that the connectors, PCB and all the other components stay away from the sphere's 60-deg cone.
>>>
>>> -- figures captions
>>> fig 1: Overall view of the current payload design fig 2: wires can be bundled. On the payload PCB same connector that is used for the multi-colour laser can be used for the 6 LEDS.
>>> fig 3: how LED board sits around the output port fig 4: the LEDs and their PCB fit inside the integration sphere's baffle.
>>> fig 5: Turret connectors do not intersect with the cone.
>>>
>>> Thanks,
>>> Houman
>>>
>>> Attachment:
>>> http://projectaltair.org/HyperNews/get/AUX/2015/05/07/20.19-59426-1.jpg
>>> http://projectaltair.org/HyperNews/get/AUX/2015/05/07/20.19-41191-2.jpg
>>> http://projectaltair.org/HyperNews/get/AUX/2015/05/07/20.19-94534-3.jpg
>>> http://projectaltair.org/HyperNews/get/AUX/2015/05/07/20.19-95051-4.jpg
>>>
>>> http://projectaltair.org/HyperNews/get/AUX/2015/05/07/20.19-86046-5.jp
>>> g
>>>
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>>>
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--
*-------------------------------------------------------------------
* Cordell Grant, M.A.Sc.
* Manager, Satellite Systems
* Space Flight Laboratory
*
* University of Toronto Institute for Aerospace Studies
* 4925 Dufferin Street, Toronto, Ontario, Canada, M3H 5T6
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