How does the LT Measure?
The LT is called an Active Confocal sensor because its focusing lens is connected to a tuning fork. This fork is constantly scanning the lens up and down throughout the measuring range. Every time the lens is focused onto the target surface, the pin-hole will generate a trigger pulse. The LT will then take a measurement of the tuning fork position. Since we know the position of the fork, we know the position of the lens, and therefore, we know the position of the target.
