Position Sensing Detectors (PSDs) are becoming more popular thanks to their simple, robust design, and high positional accuracy. To further compliment these detectors we highly recommend using a Signal Processing Circuit (SPC).
A Signal Processing Circuit is designed to directly interface with a PSD, providing it with the supply voltage and delivering the position measurement data in an easy to handle format.
PSDs generate two photocurrents per axis which travel to two contacts. One can calculate the absolute laser spot position by performing a difference over sum calculation. These photocurrents are very small. To accommodate for this the SPC converts and amplifies these small photocurrents into an easily readable value of ±12 V.
To simplify the use of PSDs in your system we can also mount PSDs as large as 10x10 mm directly onto the SPC, meaning no soldering required!
