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WOh.2
WOh.2
Associate II
November 29, 2021
Solved

What are VL53L0X_VCSEL_PERIOD_PRE_RANGE and VL53L0X_VCSEL_PERIOD_FINAL_RANGE in Long Range profile?

  • November 29, 2021
  • 1 reply
  • 1212 views

I think those two values are for HDR(High Dynamic Range). Am I right?

1. If so, is it possible to use the same value for VL53L0X_VCSEL_PERIOD_PRE_RANGE and VL53L0X_VCSEL_PERIOD_FINAL_RANGE?

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The amplitude(brightness) of the reflective sheet gradually lowers(darkens) with distance, but at a certain distance it jumps up and then begins to lower(darken).

I think there is a VCSEL period switching for the reflective sheet at the certain distance.

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If I use the same VCSEL periods, I think there is no jump of the amplitude.

2. If it is not possible to use the same value for VL53L0X_VCSEL_PERIOD_PRE_RANGE and VL53L0X_VCSEL_PERIOD_FINAL_RANGE, could I know which VCSEL Period the VL53L0X used?

Best Regards,

Wooijin

This topic has been closed for replies.
Best answer by Julien NGUYEN

Hi,

I see that you are very familiar with the camera sensor but unfortunately the VL53L0X_VCSEL_PERIOD_PRE_RANGE and the VL53L0X_VCSEL_PERIOD_FINAL_RANGE are used to check the wrap around. Long distance bright target can be wrongly measure if there is no wrap around check.

Julien

1 reply

Julien NGUYEN
Julien NGUYENAnswer
ST Employee
December 14, 2021

Hi,

I see that you are very familiar with the camera sensor but unfortunately the VL53L0X_VCSEL_PERIOD_PRE_RANGE and the VL53L0X_VCSEL_PERIOD_FINAL_RANGE are used to check the wrap around. Long distance bright target can be wrongly measure if there is no wrap around check.

Julien

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