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DLP7000: DLP7000 Using as a spatial light modulator

Sanja
Prodigy 70 points
Part Number: DLP7000
Other Parts Discussed in Thread: DLP5500, , DLPLCR70EVM, DLPC410, DLPC900

Hello,

My application is a schlieren measuring system ("Toeplers Dual Field Lens System") to visualize ultra sound waves. For this application I want to use a DMD as a spatial light modulator. I want to put my DMD in the focalplane  of my second lens and want to use as a blend, like knife edge cutt-off. So a simple application.

The application with lenses, laser, ccd-Camera is already implemented.

The Data of my pulsed Laser: Wavelength 532nm , pulse length 1,2ns, 4,5 uJ Pulsenergy

CCD Camera has the resolution:1928x1448

I am thinking of to use the DLP 7000 for my application. Because of the pitchlength which is 13,68 um. I read, that if the pitch length is higher, then there is less diffraction.

Would you recommend me the same DLP, or a another one like DLP6500 or DLP5500 or something different?

My next question is also, for this application is a DLP7000 chipset enough? What should I also  have  to order? How can I program via PC  the DMD?

I think for my application is a EVM Board to much, or what do you recommend ? Because the usage is only for a blend.

Another question is, after programming the DMD, can I switch it off and the mirrors will stand on the same place? Or it will go to the flat mode back?

Thank you for you support

  • 0
    TI__Mastermind 45645 points

    Hello Sanja,

    Welcome to the DLP section of the TI-E2E community.  Sorry for the late answer, we had a glitch in the system so this message got missed for a bit.

    Before advising you, could you explain more about what you mean by "the usage is only for a blend"?

    What pattern speed do you need. If fairly low 30 patterns per second. Then the DLPC410/DLP7000 system may work as is. We now offer the EVM pieces separately for this chipset.  You would need a DLPLCR410EVM and a DLPLCR70EVM, which mates with the controller EVM.

    A DLPLCR6500EVM might work also, but the diffraction orders would be closer together as you point out.  This system would be easier from a software point of view.

    If you plan to re-image the DMD onto your sensor, then the diffraction will not have much of an effect, unless you plan to use a very small NA out of the DMD.

    Fizix

  • 0 in reply to Fizix
    Prodigy 70 points

    ##Before advising you, could you explain more about what you mean by "the usage is only for a blend"?

    >I mean using as blend: example horizontal blend: half of the dmd pixels should be off, and the other upper half of the dmd pixels should be on... So that the Laser can reflect on the upper half and it would go to the ccd Camera directly and the other half would go to the absorber.

    Another pattern would be a vertical blend: The left half of the dmd pixels should be on, the right half of the dmd pixel should be off.

    Do you understand what I mean?

    ##What pattern speed do you need. If fairly low 30 patterns per second.

    >Ehm I dont exactly know.. I want to have for one whole measurement only one pattern. Like the horizontal blend.

    If I do a new measurement, I want to change the pattern or the blend or use the same one….

    ###A DLPLCR6500EVM might work also, but the diffraction orders would be closer together as you point out.  This system would be easier from a software point of view.

    >What do you mean with easier software? 

    ###If you plan to re-image the DMD onto your sensor, then the diffraction will not have much of an effect, unless you plan to use a very small NA out of the DMD.

    >> NA means?

  • 0 in reply to Sanja
    TI__Mastermind 45645 points

    Hello Sanja,

    First I need to make one correction:

    A DLPLCR6500EVM might work also, but the diffraction orders would be closer together further apart.   This could be advantageous if you could isolate and use just one order.

    For the speed you want either system would work quite well.  The DLP7000 is very fast, but if you are only going to use the DLPLCR410EVM GUI then you are limited by USB to around 30 patterns per second.  To get the speed you would have to create your own VHDL code to put into the APPS_FPGA, 

    If you use the DLPLCR6500EVM GUI software, you can use Pattern On-th-Fly Mode to upload and run patterns at a very fast rate.  This GUI software is more flexible than the DLPC410 GUI.

    "NA" means "Numerical Aperture".  If you are using a very small pupil after the DMD, this could affect your image.

    Fizix

  • 0 in reply to Fizix
    Prodigy 70 points

    Hello Fizix,

    Sorry, but I do not understand. My Question is , is it possible to apply one Pattern on the DMD ?

    Or in other words, do the mirrors switch all the time continuously on- off state. Or can I put one Status? like I described before?

    Because I want to programm only  pattern and use it on my measurement.

  • 0 in reply to Sanja
    TI__Mastermind 45645 points

    Hello,

    It is possible on both systems to place the DMD in one image state.  The DLPC900 controller system will periodically send a "mirror reset", but this does not switch them to the other side, but it does preturb them for a very brief period of time 2-4 µs.

    The DLPC410 system can be set to leave the mirrors without any "mirror resets" by disabling the Reset Watchdog timer, but we do not recommend leaving them in one positions for long periods without a "mirror reset pulse".  The watchdog if not disabled will send a "mirror reset approximately every 10 seconds.

    Fizix

  • 0 in reply to Fizix
    Prodigy 70 points

    Ok,

    An How can I do this?

    Is it possible to do it with the GUI?

  • 0 in reply to Fizix
    Prodigy 70 points

    I have also another question:

    If I would use this Pattern On-The-Fly Mode with the EVM of DLP 6500. Can apply Pattern 1 with a long time like 2-3 min and than change it to the next pattern?

    Is it also possible to do this with the EVM of DLP7000 with the GUI?

  • 0 in reply to Sanja
    TI__Mastermind 45645 points

    Hello Sanja,

    It is possible on the DLPC410 system to do this with the GUI.  ON the Menu Bar there is a tab labelel "DMD" which has DLPC410 control under it.  You should find an option to disable the Watchdog there.   Please see §3.5 DLPC410 Control Window on page 59 of the DLP Discovery 4100 Development Kit Software User’s Guide (Rev. A). 

    Then build a script to run your pattern for the time you want. 

    NOTE:  We do not recommend leaving the mirrors in the on or off position without resets for an extended period of time.

  • 0 in reply to Sanja
    TI__Mastermind 45645 points

    Hello Sanja,

    For the DLPC900 EVM's the FW limits the value to 24 bits, so the longest time you can display a pattern without a reset is 16,777,215 µs = 16.777 s.

    Fizix

  • 0 in reply to Fizix
    Prodigy 70 points

    Ok, Thank you..

    And how to do the complete reset with the DLPC900 EVM? Is that also possible with the GUI?

  • 0 in reply to Sanja
    TI__Mastermind 45645 points

    Sanja,

    I am sorry, I am not sure I understand your question. 

    For this platform, resets are done as part of displaying the pattern.  So at the end of the exposure time a reset is automatically done.  

    Fizix

  • 0 in reply to Fizix
    Prodigy 70 points

    Yes, this I understand.

    I mean, DLP7000 with the GUI you can deactivate this Watchdog Function.

    My question is regarding to DLP6500, how can I expand the exposure time or deactivate this reset-functionality with the GUI?

  • 0 in reply to Sanja
    TI__Mastermind 45645 points

    Hello Sanja,

    I am not sure I understand the question.  When the you say, "do the complete reset", what do you mean?  They system will do a reset at teh end of the pattern display.  If you are looping the pattern, it will have the same image up, but the mirrors will be momentarily perturbed by the mirror reset waveform.

    Fizix