Digital IR Testing

["Gavin O'connor" <ogavin@xxxxxxxxxxx>]

John

I have looked around on the internet and in many magazines but have failed 
to find digital IR tests, so i've had to come up with my own.  The responce 
of any camera, digital or Axg, will depend on many factors the main ones of 
which are, the light source used, the medium used to capture the photons and 
the materail that the light source passes through to get to the capturing 
device.  All of the cameras that i've test bar one, have all had integrated 
lenses, so my results, when completed, will show the ir responce of the 
camera system as oppose to the capturing device or the lens.  As IR values 
change outside on a regular basis, i decided i needed to control the light 
source and am using two tungsten lamps.  I do know that the lamps emit ir 
but unsure as to what amount, so later this week i am going to measure the 
spectral output of the lamps.  I now know the light source and by putting a 
filter over the camera i can tell, from transmittance tables, what frequancy 
of light is being transmitted throught lenses.  I then used two test targets 
a grey scale and a colour chart.  I have just finished recording these 
results and am looking at them as i type.  I am going to put the results 
into photoshop and measure the pixel values.  The varying degree of pixel 
value will tell me how well the camera is a detecting IR.

This project is well on the way and many of you have help me with research 
of your own and links to web sites.  If any of you have any comments on the 
above testing please contact me ogavin@xxxxxxxxxxx

Gavin


>From: "John Wood" <monsterjon@xxxxxxxxxxxxx>
>Reply-To: infrared@xxxxx
>To: <infrared@xxxxx>
>Subject: Re: Third Year Project
>Date: Sat, 8 Apr 2000 08:33:41 -0500
>
>Yes, I for one would like to know the tests that comprise this research. I
>am now committed to using only digital cameras for near IR photography. Any
>comparisons would be appreciated.
>
>In the last year I have come to love the clarity of the digital IR images 
>my
>camera gives. It is wonderful not to have all that haliation and fuzz that
>film produces.
>
>-----Original Message-----
>From: George L Smyth <glsmyth@xxxxxxxxx>
>To: infrared@xxxxx <infrared@xxxxx>
>Date: Friday, April 07, 2000 10:07 PM
>Subject: Re: Third Year Project
>
>
> >--- Gavin O'connor <ogavin@xxxxxxxxxxx> wrote:
> >> My name is Gavin O'connor and i am a student at the University of
> >> Westminster, London, England, studying Photographic and Electronic
>Imaging
> >> Science.  I'm in my final year and am collecting research for my final
> >> project, the title of which is "Digital Infrared Response".  This 
>project
> >> will cover digital cameras and there response to the wavelength from
>700nm ~
> >> 1000nm (near infrared).  I shall be comparing different models of 
>digital
> >> cameras against each other in controlled conditions and in different
> >> environments
> >
> >Gavin -
> >
> >I truly hope that you share your research with us when you have completed
>it.
> >I am planning to purchase a digital camera sometime this year (probably
>late in
> >the year) and would love to have this information when making a decision.
> >
> >Cheers -
> >
> >george
> >
> >=====
> >Handmade Photographic Images
> >http://glsmyth.freewebsites.com
> >
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