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Original question:

DLP2000: DLP use with high power laser sources and active cooling DMD

DLP2000: Want to generate fringe pattern with DLP and use time of flight method for distance measurement of object

Bhavdipsinh Rathod
Expert 2225 points
Part Number: DLP2000
Other Parts Discussed in Thread: DLPDLCR2000EVM, OPT8241, DLPC3478

Hi,

I would like to explore DLP2000 with LED/Laser to generate Fringe pattern and want to receive reflected light (with principle of time of flight) and process it with camera.

Solution should be low cost, Does DLP2000 suitable for this? can you suggest me the light source for fringe pattern using DLP and camera part suitable for this?

Thanks in advance.

  • 0
    TI__Mastermind 28005 points
    Hello Bhavdipsinh,

    The DLP2000 chipset is only compatible with LED light sources. For an example implementation, please refer to the DLPDLCR2000EVM reference design:
    www.ti.com/.../tida-01473

    The DLP2000 is suitable for time of flight and low-cost applications. As for cameras, there are a wide variety of choice available to you. Given that the system is using the BeagleBone Black, any Linux-compatible camera would suffice.

    I hope this helps. Let me know if you have further questions.

    Best Regards,
    Philippe Dollo
  • 0 in reply to Philippe Dollo
    Expert 2225 points
    Dear

    Thanks for your reply. It gives clarity to move forward.

    I have gone through the EVM suggested by you, It seems that It doesn't has DLP2000 part in BoM list (just mentioned connector and DLP2000 interfaces) so should I need to purchase DLP2000 separately with this EVM (DLPDLCR2000EVM)?

    One more thing, Could you suggest me detector(receiver) to receive reflected (time of flight) LED waves transmitted using DLP2000 or Does DLP2000 has capacity to receive it? Please correct me about my understanding.

    Also It would be thankful If you can suggest camera which I can use with BBB to analyse image and calculate distance with DLP2000 and Time of flight technique.

    Thanks you very much for your kind support.
  • 0 in reply to Bhavdipsinh Rathod
    TI__Mastermind 28005 points
    Bhavdipsinh,

    The DLP2000 DMD is included as part of the DLPDLCR2000EVM's optical engine. You do not need to buy it separately.

    The DLP2000 EVM does not have a time of flight detector/camera built into the system, so you will need to integrate one yourself. Any camera compatible with the BeagleBone Black/Linux operating system with sufficient resolution (greater than nHD) will be suitable for this application.

    I hope this helps.

    Best Regards,
    Philippe Dollo
  • 0 in reply to Philippe Dollo
    Expert 2225 points

    Hi  

    Thank you very much for your clarification.

    So i can use DLP2000 EVM with ToF detector and camera and go for PoC.

    Just last, I came to know that TI has ToF product OPT8241.

    As I have explained my requirement that I want to measure distance of all points of object (1200X1200 mm size)(contactless) with accuracy of mm. 

    I request you to share your suggestion.

    Should I use both EVM for PoC or If only single can work then which will be better in accuracy and cost wise.

    Thank you so much again for your all support.

    Thanks

    Bhavdipsinh 

  • 0 in reply to Bhavdipsinh Rathod
    TI__Mastermind 28005 points
    Bhavdipsinh,

    What is a PoC? In any case, you definitely would need to use both EVMs in tandem in order to achieve a ToF-enabled projection.

    Good luck on your design.

    Best Regards,
    Philippe Dollo
  • 0 in reply to Philippe Dollo
    Expert 2225 points

    Hi  

    Thanks for your reply.

    PoC: Proof of Concept

    Could you help to guide me for integrate this both EVM with each other to get ToF-enabled projection?

    I will go to purchase both kits.

    Hope to get required result and make it successful.

    Thanks for your kind support.

    Thanks

    Bhavdipsinh

  • 0 in reply to Bhavdipsinh Rathod
    TI__Mastermind 28005 points
    Bhavdipsinh,

    Unfortunately I am not personally familiar with the ToF-enabled EVM you have referenced, so you may need to contact the team associated with it for assistance in integrating it.

    Thanks for your communication. If you need assistance integrating the DLP EVM please let me know.

    Best Regards,
    Philippe Dollo
  • 0 in reply to Philippe Dollo
    Expert 2225 points
    Thanks Philippe for your support.
  • 0 in reply to Bhavdipsinh Rathod
    TI__Mastermind 28005 points
    Glad to be of assistance.

    Best Regards,
    Philippe Dollo
  • 0 in reply to Philippe Dollo
    Expert 2225 points

    Again Hi


    After long study, Found that OPT8241 EVM wont work to get required accuracy in depth measurement.

    Please see below requirement and advice me.

    I need to measure steady object alignment from front side (non-contact) way, Object size may be 800mm X 800 mm. I can place DLP EVM and Camera module at distance of 550 mm to 1 meter max., my query related to this EVM kit is

    I would like to use DLPDLCR3010 EVM for structure light and camera (plan to use BBB for processing) to measure 3D measurement.
    Do you share any thumb rule for accuracy achieve using this EVM and camera (request your advice ) ?
    Accuracy to achieve for depth measurement which is most important ?

    Thank you very much for your kind assistance.
    Best Regards,
    Bhavdipsinh

  • 0 in reply to Bhavdipsinh Rathod
    Expert 2225 points
    Hi

    awaited for your advise.
    Does DLP technology help for 3D measurement? with how much accuracy?
    Does DLPDLCR3010 useful for evaluation purpose in 3D measurement?

    Thanks
    Bhavdipsinh
  • 0 in reply to Bhavdipsinh Rathod
    Prodigy 90 points
    accuracy if im not wrong will depend on your requirements, you can trade-off performance with accuracy i think...
  • 0 in reply to Bhavdipsinh Rathod
    TI__Mastermind 28005 points
    Bhavdipsinh,

    As a high-level thumb rule, you can interpret the x and y resolution of your scan as follows:

    x_res = (captured image width)/(min[camera resolution width, DMD resolution width])
    y_res = (captured image width)/(min[camera resolution height, DMD resolution height])

    You should consider your setup according to the basic metrics above when designing your system. Furthermore, if you are interested in the 3010EVM I recommend you consider the DLPC3478 chipset, which will release along with a light control EVM similar to the 3010EVM with regards to resolution and size. If you are interested in the 3010EVM and want to be able to use internal pattern streaming functionality, this chipset may be a good fit for you:
    www.ti.com/.../DLPC3478

    I hope this helps answer some of your questions. Let me know how I can assist further.

    Best Regards,
    Philippe Dollo