Detection Of Low-level Optical Signals: Photodetectors, Focal Plane Arrays And Systems (solid-state Science And Technology Library)
by M.A. Trishenkov /
1997 / English / PDF
14.9 MB Download
This book is intended for designers of military and civil systems,
such as systems for guiding and control, target acquisition,
surveillance, laser range-finding, fiber-optical communications,
thermal imaging and the like, as well as for designers of
photodetectors for optical signal detection. The first question
they face is how to detect an ultimately weak optical signal. This
book gives the answer to this most important question. All the main
types of photodetectors are considered, from photodiodes (including
avalanche photodiodes) to focal plane arrays (FPA). Methods of
matching photodetectors with preamplifiers are described. The pair
photodetector plus preamplifier is treated as an integrated
detection system. Much attention is paid to different types of
noise and ways of maximising the signal-to-noise ratio (SNR).
Foundations of theory of optimal filtering of photosignals are
discussed taking due account of typical shapes of optical signals
and noise spectra. Methods for tuning quasi-optimal filters to
maximise the SNR are explained. The main problems associated with
detection of low-level optical signals are considered: operation of
avalanche photodiodes in photon count mode, filtering in the case
of charge accumulation in FPA cells, and the effect of the number
of pixels and geometry of FPAs on detection. Finally, using the
examples of the laser range finder and IR Imager, we give
guidelines for calculating the limiting parameters of
optoelectronic systems to achieve the highest possible SNR. The
book is based on many years' experience by the author and his
colleagues in the development of photodetectors and FPAs. The book
is aimed at research workers, engineers, students and
postgraduates.
This book is intended for designers of military and civil systems,
such as systems for guiding and control, target acquisition,
surveillance, laser range-finding, fiber-optical communications,
thermal imaging and the like, as well as for designers of
photodetectors for optical signal detection. The first question
they face is how to detect an ultimately weak optical signal. This
book gives the answer to this most important question. All the main
types of photodetectors are considered, from photodiodes (including
avalanche photodiodes) to focal plane arrays (FPA). Methods of
matching photodetectors with preamplifiers are described. The pair
photodetector plus preamplifier is treated as an integrated
detection system. Much attention is paid to different types of
noise and ways of maximising the signal-to-noise ratio (SNR).
Foundations of theory of optimal filtering of photosignals are
discussed taking due account of typical shapes of optical signals
and noise spectra. Methods for tuning quasi-optimal filters to
maximise the SNR are explained. The main problems associated with
detection of low-level optical signals are considered: operation of
avalanche photodiodes in photon count mode, filtering in the case
of charge accumulation in FPA cells, and the effect of the number
of pixels and geometry of FPAs on detection. Finally, using the
examples of the laser range finder and IR Imager, we give
guidelines for calculating the limiting parameters of
optoelectronic systems to achieve the highest possible SNR. The
book is based on many years' experience by the author and his
colleagues in the development of photodetectors and FPAs. The book
is aimed at research workers, engineers, students and
postgraduates.