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DLP4500: Lightcrafter 4500 for phase shifting profilometery

alvin tan
Prodigy 140 points
Part Number: DLP4500

I am currently working on a project that uses the LC4500 for a phase shifting profilometery module. I understand that the lightcraft DMD mirrors will turn on and off to produce grayscale images, and due to this turning on and off the intensity of the images i project will change which affects my results. What is the frequency at which the mirrors turns on and off, is there a fixed frequency in which i can sync my image capturing and the projection of the grayscale image?

 

  • 0
    TI__Mastermind 20045 points
    Hello Alvin,

    I will take a look into this. I haven't heard of anyone having issues taking images since the mirrors move very fast; however, I am unfamiliar with phase shifting profilometry. Are you able to detail your setup?

    Thanks,
    Kyle
  • 0 in reply to Kyle Rakos
    Prodigy 140 points

    Hi kyle, 

    I have a very simple step up of just the DLP4500 and a ueye camera. All i am currently doing is to project and capture 3 grayscaled fringe images and repeat the same process with the same images. However i realized that the intensity of each image varies and if i substract 2 of the same images all i expect to see is white noise however there is some residual image of the fringes which affects my results. 

    I would like my setup to take the same images with the same intensity at every instance. Currently i am doing the capturing manually, would a hardware trigger solve my issue?

    Thanks,

    Alvin

  • 0 in reply to alvin tan
    TI__Mastermind 20045 points

    Hello Alvin,

    So you are just trying to capture three sinusoidal images? There shouldn't be any need to worry about the mirror refresh rate. The more important aspect is syncing the camera with the hardware triggers. I would try this and I expect this will fix the problem. More information can be found in the 4500 user's guide. Feel free to follow-up if it doesn't work.

    Thanks,

    Kyle

  • 0 in reply to Kyle Rakos
    Prodigy 140 points

    Hi Kyle, i am currently trying to sync my camera and the DLP4500 however my trigger output for the 3.3V and 1.8V for TRIG_OUT_1 is always at 3.3V or 1.8V. Am i missing any configuration that i need to set?

    I have ticked the invert trigger 1 output on the GUI setting. I am currently using J13 to measure the trigger of the DLP. 

  • 0 in reply to alvin tan
    TI__Mastermind 20045 points
    Hello Alvin,

    Jumper J13 allows selection between 3.3V and 1.8V trigger output. J14 is the actual output trigger. See more information in the 4500 EVM guide at www.ti.com/.../dlpu011f.pdf

    Thanks,
    Kyle
  • 0 in reply to Kyle Rakos
    Prodigy 140 points

    Hi Kyle,

    Looks like i made a very stupid mistake right there. Thanks for the help.