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OPT3101EVM: Phase offset calibration distance

Moses Christian
Prodigy 170 points
Part Number: OPT3101EVM

Since we are currently in tensive evaluation, apologize for frequent questions.

I would like to ask about phase offset calibration that mentioned on P.9-10 of document sbau310.

If our application is measuring object at distance of 5m, is it better to calibrate phase offset at 5m rather than at 1m?

  • 0
    TI__Expert 6800 points

    Hi Moses,

    You will want to measure at a distance such that you receive > 10000 in AMP_OUT. This may not be at 1m or your target distance of 5m.

    Thank you,

    Brent Elliott

  • 0 in reply to Brent Elliott
    Prodigy 170 points

    Okay, let's say we have two options for phase offset calibration as follows:

    1. Target's AMP_OUT > 10000, 1m

    2. Target's AMP_OUT > 10000, 5m

    And the application is a measurement mainly at 5m. 

    Is there a strong suggestion saying that "2." is better than "1." for minimizing measurement error?

    I'm expecting an answer from one of these:

    1. Yes, since it is calibrated at the distance that the measurement is actually take place.

    2. Not really, calibrating at 1m and 5m doesn't matter.

    3. Other answer.

  • +1 in reply to Moses Christian
    TI__Expert 6800 points

    Hi Moses,

    Given the two choices, it is better to pick the one that is closer to the use case distance. This will lead to a more accurate calibration as long as you're still able to reach the recommended amplitude levels.

    Thank you,

    Brent Elliott