Re: [Phys-l] pinhole camera

[Joseph Bellina <jbellina@saintmarys.edu>]

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!
>
>
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