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Bottlehead Forum Welcome! Need support, you got it. Or share you ideas and experiences. |
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Bottlehead Forum Welcome! Need support, you got it. Or share you ideas and experiences. |
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In Reply to: Re: Ping Doc: photography posted by Doc B. on October 28, 2005 at 16:39:57:
I'm skeptical of this claim! Cooling down a CCD or photomultiplier
will just reduce the noise floor every so slightly. In the visible wavelengths, I dont think this is going to make a damn bit of difference between 298K and 200K which is likely all you can do with a Peltier junction (thermoelectric) cooler.For IR work, or, in the case of photomultipliers, when you are chasing single-photon events in the visible spectrum - cooling reduces your "dark current" which means your SNR is improved. But
that is only important for people chasing elusive light invisible to the human eye - i.e. dozens of photons.To really get good results, you need 77K cooling. i.e. LN2 temperatures. Forget about this. First of all, you have to slowly chill down the detector to avoid damaging it. Next, you have to deal with myriad condensation issues on the optics. You so dont want to deal with this.
I'm skeptical of Peltier cooling CCDs. Maybe for IR work.. But
visible wavelengths with a high intensity level of light? Seems like
marketing hogwash. I'd love to hear otherwise.-- Jim (It's snowing on the New England coast tonite! )
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Follow Ups
- cold CCD's - Jim Doyle 10/29/0520:00:57 10/29/05 (1)
- Re: cold CCD's - Doc B. 20:58:46 10/29/05 (0)
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