OPT3101ESTIMATOR-SW: OPT3101 Estimator settings

Hi Tsutomu,

Can you confirm that the settings in this screenshot are the same as yours? I am inputting your settings and getting 150.35mm of noise instead of your 210.06mm.

Thank you,

Brent Elliott

Hi Brent,

Thank you for your message.

Now I can get same results as yours.
It seemed that my previous values of Light Extraction Efficiency and LED Current Values was different from yours.

the results shows that distance Accuracy is 311.77mm which is about 6.2% of the target distance.
Does it mean that simulated system can't meet distance accuracy of 2% at target distance 5m?

  In the datasheet, in the section 8.2.2.4 Distance Accuracy, it's said that to choose 100mA as the illumination current

  for meeting the SNR requirement for the 18% reflective target at a 5m distance.
  And that SNR value is one to meet Distance accuracy of 2% at 5m with 18% reflective target, right?

  But the results shows more than 2% of distance accuracy with 173.6mA as illumination current.

Best regards,

Tsutomu Hattori

Hi Tsutomu,

Let me take a deeper look at this. I will let you know what I find out.

Thank you,

Brent Elliott

Hi Brent,

Thank you for your message.

I'm looking forward to your reply.

If you have any question about my post, or it's hard to understand what I mean,

please not to hesitate to ask me.

Best regards,

Tsutomu Hattori

Hi Brent,

Thank you for your message.

Of course I think that results of OPT3101 Estimator is not best value neither worst,

but I think the simulator tends to show distance noise value close to real measurement or

calculated value and distance accuracy worse than those.

Is there any way to know more reliable value of distance accuracy by OPT3101 Estimator?

Is real measurement and evaluation of  system the only way to know it?

I mean, the measurement example using OPT3101EVM written in the Application Report SBAA296

shows that distance error of up to about 2.1% and distance noise of up to about 2.5% in 10m distance

measurement. But I haven't gotten the results like distance accuracy of 2.0% at target distance of 10m

by the simulator ever.

best regards,

Tsutomu Hattori

Hi Tsutomu,

The only way to reliably know the accuracy of the system is to measure and evaluate the specific system since there will always be variables that the tool is unable to account for, and the assumptions made for things such as reflectivity ambient light, etc. will be different in practicality.

By the way, what results were you getting for the 10m simulation? I just ran the tool for 10m with a 90% reflective object and got a distance accuracy of 250mm (2.5%).

Thank you,

Brent Elliott