SiTek Electro-Optics, manufacturer of Position Sensitive Detectors (PSD) was founded under the name Sitek Laboratories in 1976 as a spin-off from Chalmers Technical University in Gothenburg Sweden. The discovery of the Lateral Photo came with the founding and the development of the first PSD by Prof. Wallmark was a fact. Today in a constantly expanding market, SiTek has gained a worldwide reputation as a constantly developing manufacturer of advanced PSD’s.

Specialised in

Research and development of tailor made Position Sensitive Detectors (PSD) and fast PSD electronics.


There are multiple application areas using the PSD:

  • non-contact distance measurement system (triangulation)
  • alignment and surface level measurement
  • position and motion measurement system
  • optical spectrum analyzer
  • three-dimensional machine vision (contour mapping)
  • angle measurement system


  • advanced facilities with clean room conditions
  • intensive research & development

Product categories

One-dimensional PSD

Two-dimensional PSD

Two-dimensional PSD







Customised PSD SiTek

Customised PSD


PSD electronics

PSD school

PSD school



PSD applications