Tunable LC Filter

[Mustafa Umut Sarac]

I think hyperspectral photography is very interesting. I want to do it bymyself and I need a tunable liquid crystal filter. Is there anyone who knows the technology. Which lc is tunable and transparent when colored ? What kind of a lc housing required ? Do electrodes needed to be transparent or electrodes at the sides usable ? What would be the thickness of the lc ? etc etc..

Best ,

Mustafa Umut Sarac

Istanbul

[keithwms]

My recollection is that the transmission spectrum of most LCs are not even approximately neutral. Anyway, you might look up the Kent State liquid crystal institute. They do have a wall on a fab room at Kent that can be variably darkened, and I recall some discussion there long ago about making variable-tint windscreens for cars. Turns out to be rather expensive, I think.

At one time I investigated the use of the photochromic materials found in the 'transitions' sunglasses. That may be possible. And you'd not need a power supply

[L Gebhardt]

Last I knew the electrodes were transparent Indium Tin Oxide coated on glass. But my knowledge is 20 years old. It may be significantly different now.