Dear All,
As an assignment I have to design a CCD Sensor based FPGA digital
Camera. However, the Camera will be exposed to XRAY (It will be placed
behind an Imaging Intensifier). Does anybody know how XRAY affects the
electronic circuits (The CCD Sensor and the FPGA ). What type of noise
should I expect and what should I do to prevent it.
Thanks in advance

On 17 Jan, 08:03, recoder <kurtulmeh...@gmail.com> wrote:
> Dear All,
> =A0As an assignment I have to design a CCD Sensor based FPGA digital
> Camera. However, the Camera will be exposed to XRAY (It will be placed
> behind an Imaging Intensifier). Does anybody know how XRAY affects the
> electronic circuits (The CCD Sensor and the FPGA ). What type of noise
> should I expect and what should I do to prevent it.
> =A0Thanks in advance

Can bits be flipped?

Do you need a RadHard FPGA?

Cheers,
Jon

On Jan 17, 2:03=A0am, recoder <kurtulmeh...@gmail.com> wrote:
> Dear All,
> =A0As an assignment I have to design a CCD Sensor based FPGA digital
> Camera. However, the Camera will be exposed to XRAY (It will be placed
> behind an Imaging Intensifier). Does anybody know how XRAY affects the
> electronic circuits (The CCD Sensor and the FPGA ). What type of noise
> should I expect and what should I do to prevent it.
> =A0Thanks in advance

A little bit of lead foil goes a long way. Depends on how much XRAY I
imagine. Be careful.

recoder wrote:
> Dear All,
> As an assignment I have to design a CCD Sensor based FPGA digital
> Camera. However, the Camera will be exposed to XRAY (It will be placed
> behind an Imaging Intensifier). Does anybody know how XRAY affects the
> electronic circuits (The CCD Sensor and the FPGA ). What type of noise
> should I expect and what should I do to prevent it.
> Thanks in advance

Ever consider using a phosphor plate to turn the x-rays into visible
light first?

On Jan 17, 12:03 am, recoder <kurtulmeh...@gmail.com> wrote:
> Dear All,
> As an assignment I have to design a CCD Sensor based FPGA digital
> Camera. However, the Camera will be exposed to XRAY (It will be placed
> behind an Imaging Intensifier). Does anybody know how XRAY affects the
> electronic circuits (The CCD Sensor and the FPGA ). What type of noise
> should I expect and what should I do to prevent it.
> Thanks in advance

Is it internal flash or external flash? If anything, flash would be
the weakest link.

linnix wrote:
> On Jan 17, 12:03 am, recoder <kurtulmeh...@gmail.com> wrote:
>> Dear All,
>> As an assignment I have to design a CCD Sensor based FPGA digital
>> Camera. However, the Camera will be exposed to XRAY (It will be placed
>> behind an Imaging Intensifier). Does anybody know how XRAY affects the
>> electronic circuits (The CCD Sensor and the FPGA ). What type of noise
>> should I expect and what should I do to prevent it.
>> Thanks in advance
>
> Is it internal flash or external flash? If anything, flash would be
> the weakest link.
I would think an old fashioned tube camera with tube amplifiers
would be the most radiation resistant.

In article <209b3e90-d60e-42b5-84fa-
9e2ce075c10e@s8g2000prg.googlegroups.com>, sci.electronics.design,
kurtulmehtap@gmail.com says...
> Dear All,
> As an assignment I have to design a CCD Sensor based FPGA digital
> Camera. However, the Camera will be exposed to XRAY (It will be placed
> behind an Imaging Intensifier). Does anybody know how XRAY affects the
> electronic circuits (The CCD Sensor and the FPGA ). What type of noise
> should I expect and what should I do to prevent it.
> Thanks in advance

CMOS doesn't like X-Rays much. There is a failure mechanism that
tends to harden CMOS SRAM bits in one direction. I'm not sure how
bad it gets though.

--
Keith

On Thu, 17 Jan 2008 21:14:46 -0500, in sci.electronics.basics, krw
<krw@att.bizzzzz> gurgled:

>In article <209b3e90-d60e-42b5-84fa-
>9e2ce075c10e@s8g2000prg.googlegroups.com>, sci.electronics.design,
>kurtulmehtap@gmail.com says...
>> Dear All,
>> As an assignment I have to design a CCD Sensor based FPGA digital
>> Camera. However, the Camera will be exposed to XRAY (It will be placed
>> behind an Imaging Intensifier). Does anybody know how XRAY affects the
>> electronic circuits (The CCD Sensor and the FPGA ). What type of noise
>> should I expect and what should I do to prevent it.
>> Thanks in advance
>
>CMOS doesn't like X-Rays much. There is a failure mechanism that
>tends to harden CMOS SRAM bits in one direction. I'm not sure how
>bad it gets though.

THE HORRORS!

Someone need to tell Agilent & Teradyne ASAP. Millions of boards a
year are run through their x-ray fault detection systems.

Digital boards quite often with memory.

In article <478fd923$0$25480$ba620dc5@text.nova.planet.nl>,
burrynulnulfour@ppllaanneett.nnlll says...
> linnix wrote:
> > On Jan 17, 12:03 am, recoder <kurtulmeh...@gmail.com> wrote:
> >> Dear All,
> >> As an assignment I have to design a CCD Sensor based FPGA digital
> >> Camera. However, the Camera will be exposed to XRAY (It will be placed
> >> behind an Imaging Intensifier). Does anybody know how XRAY affects the
> >> electronic circuits (The CCD Sensor and the FPGA ). What type of noise
> >> should I expect and what should I do to prevent it.
> >> Thanks in advance
> >
> > Is it internal flash or external flash? If anything, flash would be
> > the weakest link.
> I would think an old fashioned tube camera with tube amplifiers
> would be the most radiation resistant.
>

Vidicon tubes! I haven't seen one of those in a whole lot of years but
I'm so happy everythign is CCD now.

On Jan 17, 1:03=A0am, recoder <kurtulmeh...@gmail.com> wrote:
> Dear All,
> =A0As an assignment I have to design a CCD Sensor based FPGA digital
> Camera. However, the Camera will be exposed to XRAY (It will be placed
> behind an Imaging Intensifier). Does anybody know how XRAY affects the
> electronic circuits (The CCD Sensor and the FPGA ). What type of noise
> should I expect and what should I do to prevent it.
> =A0Thanks in advance

Hi,

There are rad-hard CCDs available. There are also rad-hard FPGA's
available. Actel uses anti-fuse technology, which is inherently rad-
hard. We (fellow engineers and I at my aerospace company) use Actel
and Quicklogic FPGAs for space-based applications.

Tom P.
=2E

> Dear All,
> As an assignment I have to design a CCD Sensor based FPGA digital
> Camera. However, the Camera will be exposed to XRAY (It will be placed
> behind an Imaging Intensifier). Does anybody know how XRAY affects the
> electronic circuits (The CCD Sensor and the FPGA ). What type of noise
> should I expect and what should I do to prevent it.

As you did not mention it, perhaps it is yet unknown: The 'NASA office of
Logic Design' did quite some studies about the influence of differend kinds
of radiation on both off-the-shelf and 'rad hard' types of electronics. Did
not see anything on CCDs, but FPGAs seem to be definitely in scope there.

There's loads of information about their results and learned lessons on
http://klabs.org/ , which is their web site.

Hope this helps,
Thiemo

--
Query a PGP key server (e.g. http://www.pgp.net/) for my public key 41068629.
Strange sender address? Please see http://www.thiemo.net/misc/list-mail.shtml

In article <a4e1p393u0n0dnui6bn4s52pmpa73lkqfm@4ax.com>,
Pillock <a@b.c> wrote:
>On Thu, 17 Jan 2008 21:14:46 -0500, in sci.electronics.basics, krw
><krw@att.bizzzzz> gurgled:
>>CMOS doesn't like X-Rays much. There is a failure mechanism that
>>tends to harden CMOS SRAM bits in one direction. I'm not sure how
>>bad it gets though.
>
>THE HORRORS!
>
>Someone need to tell Agilent & Teradyne ASAP. Millions of boards a
>year are run through their x-ray fault detection systems.
>Digital boards quite often with memory.

There's a heck of a big difference between running a board through
an xray machine a few times, and having that board run for a long
time being exposed to xrays of uncertain energy while it's operating.

--
Wim Lewis <wiml@hhhh.org>, Seattle, WA, USA. PGP keyID 27F772C1

On Sun, 27 Jan 2008 01:15:36 +0000 (UTC), in sci.electronics.basics,
Wim Lewis <wiml@hhhh.org> bloviated:

>In article <a4e1p393u0n0dnui6bn4s52pmpa73lkqfm@4ax.com>,
>Pillock <a@b.c> wrote:
>>On Thu, 17 Jan 2008 21:14:46 -0500, in sci.electronics.basics, krw
>><krw@att.bizzzzz> gurgled:
>>>CMOS doesn't like X-Rays much. There is a failure mechanism that
>>>tends to harden CMOS SRAM bits in one direction. I'm not sure how
>>>bad it gets though.
>>
>>THE HORRORS!
>>
>>Someone need to tell Agilent & Teradyne ASAP. Millions of boards a
>>year are run through their x-ray fault detection systems.
>>Digital boards quite often with memory.
>
>There's a heck of a big difference between running a board through
>an xray machine a few times, and having that board run for a long
>time being exposed to xrays of uncertain energy while it's operating.

And just what are those parameters? What level is safe? What level is
damaging? Length of time with respect to *energy* level? Frequency
domain? Studies to support that data?

Don't leave everyone hanging:

>>There's a heck of a big difference between running a board through
>>an xray machine a few times, and having that board run for a long
>>time being exposed to xrays of uncertain energy while it's operating.
>
>And just what are those parameters? What level is safe? What level is
>damaging? Length of time with respect to *energy* level? Frequency
>domain? Studies to support that data?
>
>Don't leave everyone hanging:

It's OK to leave me hanging. Like most people, I don't care much
about the effects of X-rays. My equipment isn't subjected to any
significant intensity, because it's not X-rayed while in use, nor is
it likely to go into space.

If you're so interested, why not research it yourself?

On Mon, 28 Jan 2008 14:58:32 +0000, in sci.electronics.basics,
MikeShepherd564@btinternet.com bloviated:

>>>There's a heck of a big difference between running a board through
>>>an xray machine a few times, and having that board run for a long
>>>time being exposed to xrays of uncertain energy while it's operating.
>>
>>And just what are those parameters? What level is safe? What level is
>>damaging? Length of time with respect to *energy* level? Frequency
>>domain? Studies to support that data?
>>
>>Don't leave everyone hanging:
>
>It's OK to leave me hanging. Like most people, I don't care much
>about the effects of X-rays. My equipment isn't subjected to any
>significant intensity, because it's not X-rayed while in use, nor is
>it likely to go into space.
>
>If you're so interested, why not research it yourself?

Ah, so you didn't quite catch the quite obvious drift of the
questions.

Here is a little research for you, look up the term FUD.

Follow that with "saccharine in rodents".

On Jan 17, 3:00=A0am, Jon Beniston <j...@beniston.com> wrote:
> On 17 Jan, 08:03, recoder <kurtulmeh...@gmail.com> wrote:
>
> > Dear All,
> > =A0As an assignment I have to design a CCD Sensor based FPGA digital
> > Camera. However, the Camera will be exposed to XRAY (It will be placed
> > behind an Imaging Intensifier). Does anybody know how XRAY affects the
> > electronic circuits (The CCD Sensor and the FPGA ). What type of noise
> > should I expect and what should I do to prevent it.
> > =A0Thanks in advance
>
> Can bits be flipped?
>
> Do you need a RadHard FPGA?
>
> Cheers,
> Jon

To all it matters to what level of radiation from your source gets to
your CCD camera. As a X Product Manager for a X-ray imaging company if
we placed the CCD camera behind a intensifier tube -- lots of material
between it and the camera a few lens -- we had little problem with
noise from the x-ray beam we we producing. We could still detect some
x-rays at this point but they were real weak. Now when we put the CCD
(Sony) B/W camera in the direct beam path we had issues of noise in
the CCD detector. We landed up placing the camera off axis. When we
went to a special CCD camera behind a screen and a little glass it
was not a bad but could still be seen and needed averaging to get rid
of the problems we could see. Hope this helps-- Place the camera off
axis if at all possible remember a lot of thing are transperant to x-
ray but will reflect light.

Regards
Cliff

Pillock wrote:
> On Mon, 28 Jan 2008 14:58:32 +0000, in sci.electronics.basics,
> MikeShepherd564@btinternet.com bloviated:
>
>
>>>>There's a heck of a big difference between running a board through
>>>>an xray machine a few times, and having that board run for a long
>>>>time being exposed to xrays of uncertain energy while it's operating.
>>>
>>>And just what are those parameters? What level is safe? What level is
>>>damaging? Length of time with respect to *energy* level? Frequency
>>>domain? Studies to support that data?
>>>
>>>Don't leave everyone hanging:
>>
>>It's OK to leave me hanging. Like most people, I don't care much
>>about the effects of X-rays. My equipment isn't subjected to any
>>significant intensity, because it's not X-rayed while in use, nor is
>>it likely to go into space.
>>
>>If you're so interested, why not research it yourself?
>
>
> Ah, so you didn't quite catch the quite obvious drift of the
> questions.
>
> Here is a little research for you, look up the term FUD.
>
> Follow that with "saccharine in rodents".

better yet, look up "fundamentals of nuclear hardening of electronic
equipment", L. W. Ricketts, Krieger pub.

Cheers
Terry