Photoelasticity: Using a white LCD panel as a backlight
How to do this:
[1] Create completely white jpg/png/tiff or your favoruite image file type with your favourite drawing/photo editing program. It helps if the size at least has the aspect ratio of your LCD display.
[2] View this completely white image using your favourite image viewing program in 'Full Screen' mode. If you have an easier method of making your display completely white, you can skip step [1] :-)
[3] This has to be done with a LCD display. So it really helps if you have a laptop. Laying your normal flat screen LCD flat on the floor might be a bit clumsy, but possible :-)
[4] Place your favourite clear plastic/plexiglass/perspex objects on top of the screen.
[5] Attach your circular polarising filter to your favourite lens and turn the polariser until the white LCD screen turns black in the viewfinder.
[6] Have fun!
These are the results:
The inspiration was seeing AlgenonQ's Psychedelic Petrochemicals
The principle is Photoelasticity
Note: For those who do not use a DSLR or polarising filter, you can use a good pair of polarising sunglasses with your point and shoot cameras. Though I haven't done it personally, I have seen the results of a pair of sunglasses being used as a polarising filter with a point and shoot :-)
[1] Create completely white jpg/png/tiff or your favoruite image file type with your favourite drawing/photo editing program. It helps if the size at least has the aspect ratio of your LCD display.
[2] View this completely white image using your favourite image viewing program in 'Full Screen' mode. If you have an easier method of making your display completely white, you can skip step [1] :-)
[3] This has to be done with a LCD display. So it really helps if you have a laptop. Laying your normal flat screen LCD flat on the floor might be a bit clumsy, but possible :-)
[4] Place your favourite clear plastic/plexiglass/perspex objects on top of the screen.
[5] Attach your circular polarising filter to your favourite lens and turn the polariser until the white LCD screen turns black in the viewfinder.
[6] Have fun!
These are the results:
The inspiration was seeing AlgenonQ's Psychedelic Petrochemicals
The principle is Photoelasticity
Note: For those who do not use a DSLR or polarising filter, you can use a good pair of polarising sunglasses with your point and shoot cameras. Though I haven't done it personally, I have seen the results of a pair of sunglasses being used as a polarising filter with a point and shoot :-)
posted by Navinda at 7:12 PM
3 Comments:
Impressive. So it works with any translucent object?
Probably not all. I think it requires a specific crystalline structure. Rez probably could answer that question way better than me :-)
Hi,
The way I understand it is this. The different colors are due to difference in path lengths. Crystal structure is unlikely to be coming in to play because we are considering visual wave lengths.
So I'd expect any transparent material to work. Some one repeat the experiment with polythene sheets and let us know what happens.
Thank you
-rz
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