Does VL53L8CX distance value affect by ambient value?

[JunSheng]

Currently, I'm working on a project to detect human height, but the measured height appears shorter under strong ambient light. I would like to know if the ambient light affects the distance measurements

[JunSheng]

When the person 1.7m walking around the sensor, this is the data collected from the ambient versus distance.

[John E KVAM]

Ambient is a source of noise. 

The sensor cannot detect which 940nm photons are from the sensor's VCSEL (laser) and which are from the sun. (The sun is the most likely cause of ambient.) 

So, the sensor detects how many photons are being received PRIOR to turning on the VCSEL. Then it subtracts that amount of light from each bin in the histogram. (A histogram bin contains the number of photons detected during each clock cycle.)

But the ambient is not as consistent as one hopes, and if the photon detectors are all busy detecting ambient, they are not detecting the signal.

All of this leads to noise. 

Detections are less accurate in high ambient conditions.

Unfortunately, I don't quite understand your plot. So, I cannot comment on that. 

 

[JunSheng]

My plot illustrates a person with a height of 1.7 meters moving around the sensor. As shown, the height decreases as the ambient levels increase.