Lateral-Effect Photodiode

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Position Sensitive Devices

A position-sensitive device (PSD) is a photosensor which is able to differentiate between the position where incident light strikes the sensing surface. There are uniaxial sensors which are only able to distinguish position along a single axis and duo-lateral or tetra-lateral sensors which are able to distinguish position along two axes. All of these sensors detect the centroid of light

Duo-Lateral Photodiode