Post by Timm on Jan 27, 2015 20:07:41 GMT
I've heard from a couple of experimenters who weren't getting good results with their ring lighting setups.
If the LED's shine directly thru the edge of the glass, there is a large loss due to absorption.
Unless you use very high brightness LED's, the image will be faint and distorted.
But you can use general purpose LEDS by leaving a space between the LED's and the cell (about 3-4mm),
so a greater amount of light will pass thru.
Look at this sketch:
Using this setup and a cheap digital camera I got this image from a 1T cylinder magnet on top of a 2mm thick cell:
here's a high res pix: www.ferrocell.us/images/cylinder%20on%20edge%20lit%20cell.JPG
and this image is with a 1.2T cube magnet under a 4mm cell:
here's a high res pix: www.ferrocell.us/images/magnet%20under%20cell%20edge%20lit.JPG
If the LED's shine directly thru the edge of the glass, there is a large loss due to absorption.
Unless you use very high brightness LED's, the image will be faint and distorted.
But you can use general purpose LEDS by leaving a space between the LED's and the cell (about 3-4mm),
so a greater amount of light will pass thru.
Look at this sketch:
Using this setup and a cheap digital camera I got this image from a 1T cylinder magnet on top of a 2mm thick cell:
here's a high res pix: www.ferrocell.us/images/cylinder%20on%20edge%20lit%20cell.JPG
and this image is with a 1.2T cube magnet under a 4mm cell:
here's a high res pix: www.ferrocell.us/images/magnet%20under%20cell%20edge%20lit.JPG
