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
effect of xray on fpga electronic circuits
Started by ●January 17, 2008
Reply by ●January 17, 20082008-01-17
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 advanceCan bits be flipped? Do you need a RadHard FPGA? Cheers, Jon
Reply by ●January 17, 20082008-01-17
>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 >How about: http://www.google.com/search?hl=en&q=%22effects+of+x-rays%22+%22electronic+circuits%22 Advice - buy "Space Class" devices. This will probably be from Actel.
Reply by ●January 17, 20082008-01-17
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 advanceA little bit of lead foil goes a long way. Depends on how much XRAY I imagine. Be careful.
Reply by ●January 17, 20082008-01-17
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 advanceEver consider using a phosphor plate to turn the x-rays into visible light first?
Reply by ●January 17, 20082008-01-17
"John_H" <newsgroup@johnhandwork.com> wrote in message news:tJmdnUfZyuv8_BLanZ2dnUVZ_tjinZ2d@comcast.com...> 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?Hi John, I guess that's what the OP means. http://en.wikipedia.org/wiki/X-ray_image_intensifier Maybe! I would've thought that would stop the X-rays. I guess Austin will give his SEU spiel soon. That'll teach the OP! ;-) Cheers, Syms.
Reply by ●January 17, 20082008-01-17
X-ray, Has no effect on the device, except that (eventually) the total dose will accumulate, and the Vt of the devices will begin to shift, and eventually, the device will fail. This is unlike a CCD, which may register 'hits' and display noise. Only neutrons, or protons, with LET of 1 Mev have enough energy to create charge clouds, and change bits: http://www.xilinx.com/products/silicon_solutions/market_specific_devices/aero_def/capabilities/aero_def_app.htm Contact your local Xilinx FAE to find out about X-Ray dose (how long it can "take it."). At some dose level, that usage becomes ITAR restricted (people use stuff this hard to build nuclear bombs, or operate in the presence of nuclear explosions) so you will no longer be able to buy, or use, such parts, unless the US State Department permits you to do so. I suspect for your application, our commercial parts are more that "hard" enough. X-rays, after all, are just photons, and they just do not pack enough energy to affect even the MGTs in our parts, and certainly do not affect the logic and memory. Austin
Reply by ●January 17, 20082008-01-17
Spiel? X-rays are just wimpy little photons .... SEUs are caused by cosmic rays (heavy ions, like iron, gold, etc with LET's of > 100 MeV) that create neutron showers with energies beyond 1000 MeV. Austin
Reply by ●January 17, 20082008-01-17
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 advanceIs it internal flash or external flash? If anything, flash would be the weakest link.
Reply by ●January 17, 20082008-01-17
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.
