Chapter 2 – Comparison of photon and thermal detector performance

摘要: The chapter investigates the performance of both photon and thermal detectors, with emphasis on material properties, device structure, their impact focal plane arrays (FPA) performance, especially in long wavelength infrared (LWIR) very (VLWIR) spectral regions. In comparison detectors have been considerably less exploited commercial military systems. reason for this disparity is that are popularly believed to be rather slow insensitive detectors. effort develop has extremely small relative speed quite adequate non-scanned images two-dimensional comparative studies, more attention paid a wide family Progress (IR) detector technology connected semiconductor IR included class show selective dependence response per unit incident radiation power. They exhibit perfect signal-to-noise fast response. Thermal operate simple principle, is, when these heated by incoming temperature increases changes measured any temperature-dependent mechanism, such as thermoelectric voltage, resistance, pyroelectric voltage. extrinsic require cooling than intrinsic having same limit. theoretical detectivity value much dependent requirements attain background fluctuation noise general favor at higher cryogenic temperatures lower temperatures.