Other Parts Discussed in Thread: OPT8241,
Hello -
I am evaluating the OPT8241 and OPT9221 for a long-range sensing application. This is only theoretical analysis at this time, so many of the operating paramaters may change.
It is my understanding that the max range is limited due to the "wraparound" effect occuring in the integration phase. That is, the sensor is designed to read the signal within the pulse width timing of the illumination pulse.
Our application is to perform in the range of 300m to 1000m. Theoretical design includes an illumination lens design giving a FOV of <1 degree. At these distances, the roud trip timing combined with the sensor design drives an operating frequency of 100kHz, well below the lower limit of the device. This is daylight operation, but the illumination module is yet to be designed, so assume that the power will be sufficient to meet the design needs.
My question: can the illumination start-of-cycle and sensor start-of-cycle can be decoupled in the Integration phase? That is, can I design the illumination module such that it operates in the 20-40MHz range, but delay the sensor activation a suitable time to allow round-trip transit (of course, assuming its timing cycle is locked in with the illumination timing)?
What is the function of the illum_en_early and illum_mod_early settings in the OPT9221 (that is, is it merely to allow an early signal for an external illuminator so there is time for it to awaken, or does it offer a means to achieve longer range through starting the pulses early)?
Thank you,
Bob