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OPT3101: OPT3101

eli
Guru 13485 points
Part Number: OPT3101

Hi

Could you advise regarding distance meter 20mm to 50mm with accuracy < 0.1mm ?

Do you might think it could work with OPT3101?

If not any other recommendation?

  • 0
    TI__Mastermind 25855 points
    Hi Eli,

    OP3101 cannot do sub mm precision. More like 1-2 mm. We have a system estimator on its page online for simulating performance.

    Best,

    Alex
  • 0 in reply to Alex Bhandari-Young
    Guru 13485 points

    Hi

    According to the simulating estimator, the minimum distance could be set to 1mm with maximum distance of 30,000 mm (see table 1)

    Regarding to the accuracy: - see figure 9:

    If for 200mm the accuracy is 1mm, then for 50mm we might get 0.25mm

     

    And I have no idea what wad the averaging of this, if we will increase the averaged data we might get better accuracy…

  • 0 in reply to eli
    TI__Mastermind 25855 points
    Hi Eli,

    Error does not scale linearly with range so you won't get 0.25mm at 50cm. You can use the inputs on the right of the estimator tool to set a target distance and see the resulting error. You might be able to get the estimator down to .5mm but not .25mm. This is explained in 4.7.1 Distance Resolution section of the system design doc posted online www.ti.com/.../sbau305a.pdf since the resolution of the device is .22mm. I would still say that 1-2mm will be a practical limit here even if the estimator says you can theoretically get .5mm. If you have very good optical design and cross talk calibration then perhaps possible to get below 1mm but we have not seen this in practice yet.

    For averaging vs noise the same doc about in the following sections also talks about this difference.

    Best,

    Alex