Re: latest scam: "X-RAY SPECS" for camcorder

[Tim Sullivan x5830 <sullivan@KENYON.EDU>]

> > See below.   No doubt it's a $0.50 infrared filter disk, paired with a
> > particular type of fabric which has some IR sensitivity.
>
> > ((((((((((((((((((((( ( (  (   (    (O)    )   )  ) ) )))))))))))))))))))))
> > William J. Beaty                             SCIENCE HOBBYIST website
> > billb@eskimo.com                             http://www.amasci.com
>
>
> Pardon my ignorance, but was this the secret behind those infamous
> X-ray vision
> glasses that used to be advertised in the back of comic books?
>
> And how do you get IR sensitivity in a passive device? A single IR
> photon can't
> produce a visible photon by fluorescence. Can you have unstable chemical bonds
> triggered by IR photons?


>        The CCD sensors in the video cameras have pretty good IR sensitivity.
> Filtering out some/most of the visible gives you these 'unusual' images.

> Chuck Britton                                   Education is what is left when
> britton@odie.ncssm.edu                          you have forgotten everything


Let me see if I can refine my question about IR sensitivity. I was responding
to Bill's mention of a "fabric which has some IR sensitivity." By "fabric" I am
guessing that Bill means a textile of some sort coated by a dye or other
chemical. I understand (in general terms) how many white fabrics are treated
with chemicals that fluoresce in the UV thus giving them "UV sensitivity". But
since fluorescence converts high energy photons into lower energy photons, I
was wondering about what process could give "IR sensitivity" to a fabric/dye
combination (my unclear "passive device" reference. Of course if you add energy
as in a CCD there is no dilemma.)

So, are there fabrics with IR sensitivity and how do they work?

Tim

sullivan@kenyon.edu