Resena: Sensors transform signals from different energy domains to the electrical domain. Figure 1.3 classifies signals in six domains. The uppermost domain in Figure 1.3 contains all signals of the radiant or optical domain. Optical sensors are able to translate these signals into electrical signals, which are depicted in the lowest domain. An example is an image sensor that translates a picture into an electrical signal. The next domain, to the right is the mechanical signal domain. For example, an accelerometer or airbag sensor is able to translate mechanical acceleration into an electrical signal. Similarly, a temperature sensor translates the temperature into an electrical signal. Even electrical sensors exist. They translate electrical signals into other electrical signals, for instance to measure accurately the voltage difference between two skin electrodes on the chest of a patient. To the lower left is the magnetic domain. A Hall plate is able to convert a magnetic signal into an electrical signal. And finally, from the chemical and biochemical domain sensors are able to translate these signals into electrical ones. Examples are pH sensors and DNA sensors.

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