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Compiler/OPT8241: Opt8241 phase data problem.

zkm zkm
Prodigy 40 points
Part Number: OPT8241


Tool/software: TI C/C++ Compiler

hi:

I designed the opt8241 sensor board, met with some problems now, opt8241 output phase information is not accurate, in the case of close range data no problem, but when the distance is greater than 1.5 meters, phase data instead of small,

I think it may be that the signal quality of the light modulation module is not good. Is that possible?Is there any other possibility?

  • 0
    TI__Expert 3495 points
    I think you are seeing 'aliasing'. Since ToF measures distance by measuring the phase delay of modulated signal, at some point, the phase will wrap around (i.e., become "small" again). That maximum distance is called 'unambiguous range', and is determined by c / (2*f), where 'f' is the modulation frequency, and 'c' is speed of light.
  • 0 in reply to Larry Li
    Prodigy 40 points
    The modulation frequency is 24mhz. It should be able to measure 6.25 meters, but the 1.5 meter data is not correct.