CN

PSD Detector

One Dimensional Series

The Segmented Photodiodes with separate active areas are composed of two PDs with a common substrate at minimal intervals. When the line spot is irradiated to two quadrants at the same time, different photocurrent signals can be generated, and one-dimensional coordinates of the spot can be accurately obtained by calculation.
Application: machine tool measurement, precision displacement measurement, surface profile measurement, etc.

Two Dimensional Series

QPD is a PD or APD with a photosensitive surface divided into four quadrants with very small spacing between adjacent areas and a common substrate. The signal spot of regular shape is irradiated to the four quadrants at the same time, so that the quadrants can generate different photocurrent signals, and the two-dimensional coordinates of the spot can be accurately obtained by calculation. The position resolution of the detector can be up to 0.1μm or less, and it is less affected by the signal-to-noise ratio and very suitable for applications that require high alignment accuracy.
Application: Spot centering, precision displacement measurement, vibration detection, angle measurement, eye tracking, guidance, etc.