Optical sensors
Abstract
The majority of optical displacement sensors are based on variable reflection or transmission. Optical force sensors are derived from displacement sensors by adding one or more spring elements. Since light is a wave, one can also make use of travel time (or ToF), phase shift and interference.
First we discuss in this chapter the major optical variables and parameters. Next we review the properties of some commonly used electro-optical and optoelectric components as measurement tool. The subsequent section deals with methods on how to build up sensing systems for the measurement of position and displacement, using such components. Special attention is given to the position sensitive diode (PSD), optical triangulation, ...
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