Sensor for measuring up to 50cm with an accuracy of +/-2 milimiter or better

Other Hardware Sensors
1

Hi everybody.
I need to measure distances up to 50 centimiters with an accuracy at 50centimeters of +/-2 milimiter or better over polished bronze.

Which sensor should I use?

Thanks in advance for your help!

2

you could try TOF sensors such as the VL53L1X, e.g.

how large is the target? anything else in the area which could upset the senor readings?

3

Thanks for your help horace.

The sensor you recommended (VL53L1X) is not suitable, because it has (as stated in it´s datasheet in page 17->https://www.pololu.com/file/0J1506/vl53l1x.pdf ) a ranging error (defined as accuracy+repetibility errror ) of apprximately 20-25milimeters, and that is very big compared to the 2 milimeters of accuracy that I need.

Do you have any other suggestions?

The size of the trget will vary between 0.5 meters x 0.5 meters and 2 meters x 2 meters. There wont be anything upseting the sensor readings.

4

I found in practice these devices required calibrating and I also averaged readings over 10 samples

have a look at ST's range of proximity sensors

also worth looking at industrial Ultrasonic Sonar Distance Sensors