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OPT3101: Question on how radiant intensity/FOV of illumination LED affects range

Andrew Loomis
Prodigy 80 points
Part Number: OPT3101

I read the OPT3101 datasheet and the "Introduction to Time-of-Flight Optical Proximity Sensor System Design" app note, and I'm still wondering how LED's with different radiant intensities and FOV will affect max range of the system. For example, the LED used in the app example was the SFH 4550 with radiant intensity of 1100mW/sr and FOV of 6 deg, but the SFH 4650 has an equivalent output power of 180mW, but only a radiant intensity of 90mW/sr and greater FOV of 30 deg. I did not find any equations in the app notes/datasheet that take this into account when computing max range, but I'm new to optics and TOF, so maybe I missed something.

  • 0
    TI__Mastermind 25845 points
    Hi Andrew,

    The max range will depend on a number of factors such as the LED, photodiode, target reflectivity, noise requirements, and the sample rate of the OPT3101 so there isn't an equation that can be given just using the FOV and intensity to get range.

    However, we are working on a system simulator tool that will allow you to enter these parameters and will estimate the range of the device. It has not been released yet though as it is still in development.

    Best,

    Alex
  • 0 in reply to Alex Bhandari-Young
    Prodigy 80 points
    Thanks Alex, could you point me to any resources to learn how to choose a certain LED based on range/FOV requirements? I just want to get a head start before your tool comes out. When is the ETA on this new tool?
  • 0 in reply to Andrew Loomis
    TI__Mastermind 25845 points
    Hi Andrew,

    The simulator tool will be released in July.

    For calculations based on the parameters I mentioned in my first response (including range and FOV) you can refer to section 8.2.2.4 Distance Accuracy in the Application and Implementation section of the datasheet. It gives all the needed equations.

    Best,

    Alex