Design and Performance of a Laser-Based Compact Position Sensor for Long Standoff Distance

In this paper, we design and demonstrate a compact laser-based sensor for measurement of the position of a target placed at a long standoff distance. To make the sensor compact, the beam-folding technique was used in the path of the converging light from the lens, which ultimately falls on the position-sensing detector (PSD). The position resolution of 1 mm at a standoff distance of ~1000 mm betwe...