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Original question:

[FAQ] OPT3101: What is the accuracy at short distances

OPT3101: OPT3101

Wesam Bachir
Prodigy 20 points
Part Number: OPT3101


Could you please explain how the amplitude is measured by OPT3101?. What is the formula  (describing the relationship between the amplitude measured by OPT3101 and distance) that is used in OPT3101 estimator tool? 

  • 0
    TI__Genius 9380 points

    Wesam,

    The OPT3101 is ITOF (Indirect Time of Flight) not DTOF (Direct Time of Flight) it is much more accurate and stable method of determining distance because it is not dependent on reflection percentages, colors , ambient light or signal amplitudes that can be inaccurately represented. The distance measurement is based on an I/Q demodulation concept. The I_Phase and Q_Phase creates a phase angle that is used to determine the distance. The I and Q are complex numbers. I and Q Data is a signal representation much more precise than just using a series of samples of the momentary amplitude of the signal.

    Lookup I and Q demodulation. The OPT3101 is based on this.