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Sense light through opaque, thin-walled plastic

Edwin Geerdink
Prodigy 10 points
Other Parts Discussed in Thread: OPT3002, OPT3001

Hello all,

We are looking for a sensor (OPT3002 optional) to adjust a LCD screen, influenced by artificial and daylight.

Is it possible to position the sensor behind a thin-walled (0,15mm approx.), opaque plastic? We know this will let light through if a LED is positioned behind it.

But will it also work the other way around by daylight or artificial light?

I hope somebody has experience in this.

Kind regards, Ed

  • 0
    TI__Mastermind 25895 points
    Hi Ed,

    Do you know the attenuation of the plastic? OPT3001 is made to work with dark glass and we have some documentation on it. OPT3002 should work as well, but it does not have IR rejection. If the attenuation of visible visible light is larger than the attenuation of IR light the addition of the plastic could increase the sensitivity to IR. It will be helpful if you can get the spectrum response of the plastic as well. There is a section in here on using a dark glass covering here. The information should also apply to plastic. www.ti.com/.../sbea002a.pdf

    Best,

    Alex
  • 0 in reply to Alex Bhandari-Young
    TI__Mastermind 49956 points
    Ed,

    I'm closing this thread since there hasn't been any followup in a while. If you have further questions feel free to post them and the thread will automatically reopen.