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Re: [Phys-l] pinhole camera



I am probably missing Joe's point, but I believe that for any lens
at any optical frequency, the image is a convolution of the source spatial
frequencies and the aperture at which the source is presented.

Brian Whatcott


At 07:53 AM 4/16/2007, you wrote:
The problem with the pin hole X ray use is that it assumes that the X-
rays are reflected isotropically, when often they are not, so the pin
hole image is a convolution of the spacial array of the surface with
the intensity of the X-ray reflected in that direction.

joe


Joseph J. Bellina, Jr. Ph.D.
Professor of Physics
Saint Mary's College
Notre Dame, IN 46556

On Apr 16, 2007, at 8:40 AM, Brian Whatcott wrote:

> At 04:32 PM 4/15/2007, you wrote:
>> Here is an application in which a pinhole camera can be used
>> today. (I
>> do not remember where I read about this, years ago.) Suppose you want
>> to know about distribution of X rays at the surface from which
>> they are
>> emitted. A lead sheet with a pinhole, plus an X-ray film, is a
>> solution. The film will produce "the image" of the source. Yes, a
>> lens
>> focusing X-rays, if it existed, would be desirable.
>> _______________________________________________________
>> Ludwik Kowalski
>
>
> Focusing mirrors for imaging X-ray sources are made by exploiting
> reflection at glancing incidence. They look like capillaries, or
> coaxial rings.
>
>
>
> Brian Whatcott Altus OK Eureka!
>
>
> _______________________________________________
> Forum for Physics Educators
> Phys-l@carnot.physics.buffalo.edu
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Brian Whatcott Altus OK Eureka!