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Total reflectivity of DLP9500

Remko Koornneef
Prodigy 35 points
Other Parts Discussed in Thread: DLP9500

Hi,

Is there anybody who has knowledge of the spectral reflectivity of a DLP9500 dmd (total reflectivity)? I am only able to find the transmission curves for the different types of windows. Another part is of course the reflectivity of the mirror itself. I am especially interested in a broad wavelenght range (300-2000nm) but all information is welcome.

Best regards,

Remko 

  • 0
    TI__Expert 6370 points

    Hi Remko,

    The reflectivity of the micromirrors is 88% up to 700 nm. To get a more complete understanding of reflectivity across different wavelengths, the reflectivity of the micromirros is fairly similar to that of bulk aluminum, see this link:

    http://en.wikipedia.org/wiki/File:Image-Metal-reflectance.png

    The other determining factor of total reflectivity, as you mentioned, is the window. A good resource on wavelength transmittance through DMD windows (which you may have already found) can be viewed here:

    http://www.ti.com/lit/dlpa031

    Please let us know if you have any other questions!

    Best Regards,

    Trevor

    (Edited to correct links and for clarity)

  • 0 in reply to Trevor Dowd
    Prodigy 35 points

    Hi Trevor,

    Thank you for the fast reply. But I still find it strange that TI is not providing the total reflectivity including all its components. Especially for the DLP9500. Because there is no data available from the UV enhanced window with AOI of 30 degrees, which is supplied for the Corning window. This makes it even more difficult to do basic calculations of the tot reflectivity and the light input needed for my purpose.

    I will try to get in contact with our optical group of the university to seed if they can do some measurements on it.

    Best regards,

    Remko

  • 0 in reply to Remko Koornneef
    TI__Expert 6370 points

    Hi Remko,

    Unfortunately we do not have data on transmissivity of the UV window with an AOI of 30 degrees. While an approximation can be made with the data that has an AOI of 0 degrees, to find information for 30 degrees, you would have to take measurements.

    Best Regards,

    Trevor

  • 0 in reply to Trevor Dowd
    Prodigy 35 points

    Hi Trevor,

    Sure, it has to be measured, but I have to take apart a DMD which costs me about 8000 euro.  I am not willing to spend this money on something that to my opinion should be provided by the manufacturer. This is normally the case with all kind of equipment.

    By pupping off the window, my warrenty will end. This was clearly stated at the DLP symposium in Frankfurt last week. Also the special additives in the DMD can come out and this will limit the lifetime of my DMD significantly.

    Also fairly expensive equipment is needed to perform these measurements. These are impossible to perform without taking apart the DMD. If there is a possibility to send me a separate window, I think we will have the equipment at the University to perform these measurements. Could you provide me with one?

    Best regards,

    Remko

  • 0 in reply to Remko Koornneef
    TI__Expert 6370 points

    Hi Remko,

    Unfortunately, we will be unable to support such a request, but I would like to follow up with you privately. I have added you as a friend in the system, please accept the friend request and we can go from there.

    Thanks,

    Trevor