A laser beam emitted from the semiconductor laser is applied to the target. The light reflected from the target is collected by the receiver lens and focused on the light-receiving element. When the distance to the target changes, the angle of the reflected light passing through the receiver lens changes, and the light is focused at a different position on the light-receiving element.
The measurement accuracy of the laser sensor utilizing triangulation is greatly affected by the following two factors: optical design and stability of received light intensity and waveform.