Specific detectivity

From Wikipedia, the free encyclopedia

For a photodetector, a figure of merit used to characterize performance, equal to the reciprocal of noise equivalent power (NEP), normalized to unit area and unit bandwidth.

Specific detectivity, D ^* (synonym D-Star), is given by , where A is the area of the photosensitive region of the detector and Δf is the effective noise bandwidth. Its common units are , also called the Jones in honour to R. Clark Jones who defined this magnitude. ^{[1] [2]}

Given noise equivalent power can be expressed as a function of responsivity, noise spectral density (A / Hz^{1 / 2}) and noise bandwidth as , it's common to see Specific detectivity expressed as .

[edit] References and footnotes