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OPT8241: for sensing long distance than now

TAEWAN KIM
Prodigy 10 points
Part Number: OPT8241
Other Parts Discussed in Thread: OPT9221, CSD16301Q2

Hello, I'm taewan Kim, H/w engineer.

We are developing LiDAR module with opt8241 and opt9221.

And i have some questions for sensing long distance than now.

We are using four LD(22045498 in Lumentum) parallel with power MOSFET(csd16301q2).

Now, we can detect distance up to about 12m and we want to detect up to 30m.

We are discussing the method that increasing the number of LDs in parallel.

1) So we are wondering that how many LDs we can use for detecting 30m.

2) What is the side effect when we use a lot of LDs in parallel.

 

I'm sorry about my lack of knowledge in these fields.

Please inform to me even if it is small knowledge.

 

thanks.

  • 0
    TI__Expert 3495 points

    Hi Taewan,

    1) So we are wondering that how many LDs we can use for detecting 30m?

    Best is to use the System Estimator Tool to help you decide.  I did a quick try the tool showed you need ~8W peak power for 30m at 1% depth accuracy.  With that you can decide how many LDs you need, based on the peak power of the LD that you choose.  If you are connecting them in series, you will need to worry about max voltage so it is compatible with component max voltage rating.  If you connect them in parallel, you will need to worry about synchronization of modulation (both frequency and duty cycle).

    2) What is the side effect when we use a lot of LDs in parallel.

    If you connect them in parallel, you will need to worry about synchronization of modulation (both frequency and duty cycle).

    This training video on illumination might be informative.

    -Larry