Abstract
Radiometers are the devices for registration of temporally incoherent radiation, for example, of thermal origin. With the help of radiometers, it is possible to measure temperature of remote objects and to analyze their spectra. In optical domain, there are basically two types of radiometers: with the direct detection receivers and with the heterodyne receivers. The last ones have the advantage of better sensitivity and spectral resolution. Besides, heterodyne radiometers make it possible to create stellar interferometers for precise measurement of angular dimensions of space objects. Characteristics of laser heterodyne radiometers are basically determined by two features: sensitivity of photo-detector and signal processing organization. Insofar as heterodyne de- tectors were analyzed in every detail in Chap. 3, the current chapter is focused on signal processing principles. Specific optical problems are discussed only in the end of the chapter, in conjunction with laser heterodyne interferometers.
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Protopopov, V.V. (2009). Laser Heterodyne Radiometers. In: Laser Heterodyning. Springer Series in Optical Sciences, vol 149. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-02338-5_4
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DOI: https://doi.org/10.1007/978-3-642-02338-5_4
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