If that 62ms is true then I see a big GO for this project...
Just waiting for led to make real test.
And probably then I will hit the problem of focusing.
The optics isn't my area so I will probably make some mistkes.
If I look at the LED chip then the best should be if I be able to
make some kind of collimator to just project chip as is (to mimic
paralel radiation from chip)
If source is spot then single lense should be enought, but led isn't
single spot....
On 09/19/2013 01:24 PM, Robin Whittle wrote:
> Hi Slavko,
>
> You wrote:
>
>> Robin can you test what time takes if the led is just 1 cm above
>> (instead 34) board?
> The area covered by the ligh is 1 / (34 x 34) of whatever it is at cm so
> the time scales in the same way.
>
> My exposure tests were at 30cm and I guess that somewhere between 40 to
> 80 seconds would be ideal. If we assume 60 seconds, then the time to
> get the same exposure at 1cm would be:
>
> 60 / (30 ∗ 30) = 62 milliseconds
>
>> I know the area will be small but I'm just interested how big efect the
>> distance have on time?
>> If source is point then relation is square from distance but the led
>> isn't point source...
> For a photoplotter you would have quite a different optical arrangement
> from simple radiant light hitting the Riston.
>
> - Robin
>