Tunable LC Filter

Discussion in 'Camera Building, Repairs & Modification' started by Mustafa Umut Sarac, May 19, 2009.

  1. Mustafa Umut Sarac

    Mustafa Umut Sarac Member

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    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
     
  2. keithwms

    keithwms Member

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    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 :wink:
     
  3. L Gebhardt

    L Gebhardt Subscriber

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    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.