Question

How many sensors are needed to measure part thickness by using laser triangulation sensors?

(a) 1

(b) 2

(c) 3

(d) 4

I had been asked this question by my school teacher while I was bunking the class.

This question is from Laser Inspection in section Machine Vision Systems of Engineering Metrology

Answer 1

Right choice is (b) 2

To elaborate: It is possible to measure part thickness or the inside bore diameter with the help of 2 sensors in laser triangulation sensor technique. The measurement accuracy and measurement range are directly related.