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DLPLIGHTCRAFTER: DLPlightcrafter3000, cancel the refreshing mirror command

Institute of Computing
Prodigy 80 points

Part Number: DLPLIGHTCRAFTER

Hi,

I have an issue with intensity fluctuation of the image created by DLPlightcrafter3000. This is the fraction of a second. I have included the setup, the pattern on the DMD, the movie on the CCD after a microscope objective. The image is in the order of 10um size. Since I want to use this for quantum gas microscopy, I need to have a very stable intensity and I am sure about laser intensity fluctuation. I have heard that there is refreshing mirror sequence which is running for every sub-second. I am looking for a way to disable this refreshing sequence or at least make it less frequent (every several seconds). It would be great to help me.

best,

mahmood Sabooni,

saboonim@gmail.com

  • 0
    TI__Mastermind 30600 points

    Hi Mahmood,

    Thanks for your question and welcome to the DLP forums. It looks like you're using the "static image" mode. Have you tried making a pattern sequence and setting the exposure to be 2 seconds long? This might help reduce your issue. You can find details on the pattern sequence modes in Section 2.8 in the user's guide.

    http://www.ti.com/lit/ug/dlpu006e/dlpu006e.pdf 

    I hope that helps,

    Paul

  • 0 in reply to Paul Goedeke
    Prodigy 80 points

    Hi Paul,

    Thanks for your suggestion. I have learned a lot after playing with sequence part but I do not think the fluctuation that I mean is related to this. I have run two cases:

    1. Video 006.avi and corresponding setting in figure 006.jpg: sequences with 2 second exposure time

    2. Video 007.avi  the static image.

    It seems these two are identical from fluctuation that I mean.

    I have heard that there are refreshing steps between even static images to prevent mirrors to stuck on their states after some times. it seems this will prolong the DMD lifetime. I am thinking to remove this step from the whole protocol but I do not know how?

    Have you ever heard about this issue?

    Mahmood,

  • 0 in reply to Institute of Computing
    TI__Mastermind 30600 points
    Hi Mahmood,

    This is an issue we have heard of before - I did a little research on this topic. Here are some posts in which users have asked the same question:

    e2e.ti.com/.../350215

    e2e.ti.com/.../1700353

    e2e.ti.com/.../1598943

    When you did your test, what bit depth patterns did you set? I believe that you will get the behavior you are looking for if you select 1 bit per pattern.

    -Paul