Measurement Errors LMSxxx

A statistical error means, when you do several measurements, you won't get the same value every time. Also when you take a measuring tape and do the same measurement several times, you will not get the exact same value every time.

A systematic error depends on the measurement principle and on the construction variation of the scanner.

The maximum measurement error of a device is the sum of the statistic and the systematic error. You can get such an error only when you just look at one measurement value, because, as more scans you take, the statistic error gets smaller because you can take the mean value of all scans.

When the object surface is not flat but irregular and especially, if within one single laser spot, there is some distance change to LMS5xx, will the output of the detected distance value to be the average distance or the nearest distance, or other situation?
We cannot give an defined answer to that question, but here are some notes that may help:
* generally the distance value depends on the energy that was reflected from the object. the generation of a real measurement value depends on weather there was enough energy reflected. For example if the nearer part of the object is reflecting a lot of light, that you may measure a short distance, compared to an object that reflects the same energy over all it's surface.
* We had a look at the special case, what is happening if the target is skewed. Some time ago there have been measurement, where the target was skewed in steps of 10°. That had nearly no influence to the distance value, so the result was, the measured value was over all distances not far away from the mean value. So we can say it depends always on the target and it's remission. If you take a real bright target, results can be different.