• State TI Thinks Resolved
  • Locked Locked
  • Replies 5 replies
  • Answers 2 answers
  • Subscribers 30 subscribers
  • Views 466 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

OPT3101: Distance Measurement

Sam Ref
Expert 1610 points
Part Number: OPT3101
Other Parts Discussed in Thread: TDC7201

Hello

In a factory automation application we are trying to measure a varying distance between a moving object and a fixed heavy metal (steel) plate. We must attach the sensor to the moving object. The distance to be measured varies between 0 and 25mm. Are we able to use your OPT3101 evaluation module to realize this measurement? 4Ksps is just good enough for us.

 

If not, does TI have other sensing system that can help us?

 

Regards

Sam

  • 0
    TI__Mastermind 25815 points
    Hi Sam,

    What is the minimum distance you need and how much resolution? Are you able to set 0mm as a fixed offset some millimeters in front of the emitter and receiver? Setting 0mm right at the optics might be a bit challenging due to triangulation error.

    Have you also seen our system estimator tool online? This can help in simulation range and performance as well.

    Best,

    Alex
  • 0
    Expert 1610 points

    Hi Alex,

    Thanks for responding.

    Resolution we need is 0.1mm or better. Min distance can change from 0 to 50mm we have the freedom to change the location of the sensor.

    I think before we delve into triangulation and system estimator it might be a good idea to address whether we can realize 0.1mm resolution and 25mm measurement range.


    Regards

    Sam




    On 22/04/2019 9:36 am, Alex Bhandari-Young wrote:

     

    A Message from the TI E2E™ Community
    Texas Instruments

     

    Alex Bhandari-Young replied to OPT3101: Distance Measurement.

    Hi Sam,

    What is the minimum distance you need and how much resolution? Are you able to set 0mm as a fixed offset some millimeters in front of the emitter and receiver? Setting 0mm right at the optics might be a bit challenging due to triangulation error.

    Have you also seen our system estimator tool online? This can help in simulation range and performance as well.

    Best,

    Alex

     
     

    You received this notification because you subscribed to the forum.  To unsubscribe from only this thread, go here.

    Flag this post as spam/abuse.

    refid:7191082e-0871-4471-b09d-1482e5439b5c
  • 0 in reply to Sam Ref
    TI__Mastermind 25815 points
    Hi Sam,

    We cannot do 0.1mm resolution. The ADC limits the device to 0.22mm resolution, but error and noise make the practical resolution 1-2mm best case.

    More details here e2e.ti.com/.../724400
    and in the system design guide if you are interested.

    Best,

    Alex
  • 0 in reply to Alex Bhandari-Young
    Expert 1610 points

    Hi Alex

    Many thanks. Very clear answer.

    Does the same limitations (in terms of resolution) apply to TDC7201-EVM?

    If so....does TI has any solution for us that would allow us to measure distance with a resolution of 0.1mm and measuring range of 25mm, where we have the flexibility to offset that range by up to 50mm?

    Regards

    Sam

  • 0 in reply to Sam Ref
    TI__Mastermind 25815 points
    Hi Sam,

    The TDC7201 should not have the same limitation. This is a direct time of flight sensor (OPT3101 is indirect because it measures phase shift rather than directly the time for light to travel there and back) so the technology is a bit different. There will be some limitation but this will be determined by the speed of the TDC chip. I don't directly support TDC so I would suggest creating a new post for the TDC7201-EVM to get someone who can help there.

    Best,

    Alex