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Performance measures provide a quantified evaluation of system performance. These measures often indicate aggregate performance, covering several lower-level parameters in a single measure. Depending on the sensor application, one or more of these expressions provide an optimum sensor performance figure. For example, the sensitivity of an optical communication receiver is described in terms of the SNR ratio at the sensor, whereas the performance of a thermal camera is expressed in terms of the detectable temperature difference. The motivation for using performance measures is given in Section 1.5.7. Examples of the application of performance measures are given in Chapter 9.
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