[quote author=Fu-Kwun Hwang link=topic=2231.msg8277#msg8277 date=1310218693]
Could you explain it in more detail? It will be even better if a simple drawing is provided.
[/quote]

Hi!

Here is an image for the experimental set-up, with additional information.
http://img.photobucket.com/albums/v608/steviet/scan0002.jpg

Cheers!
Stevie