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EMISSION AND ABSORPTION OF RADIATION
THERMAL DETECTORS OF INFRARED
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absorption amplifier band bandwidth black-body bolometer caesium bromide caesium iodide cathode cent circuit coefficient conduction constant crystals current noise curves deflexion described discussed dispersion effect electrical electrons emission energy equation films filter flicker noise fluctuations fluoride frequency galvanometer germanium give given in Fig glass Globar grating heat Ibid incident infra-red detectors infra-red radiation input Inst instrument Johnson noise Jour layer lead selenide lead sulphide lead telluride limit lithium fluoride maximum mean square value measurements metal minimum detectable power mirror observed obtained ohms operation optical optimum output particles photo-cell photo-electric Phys polarization potassium potassium bromide prism prism material Proc quantum quartz range reflection refractive index region resistance resistor rock salt shot noise shown in Fig signal silver chloride slit spectrometer temperature thallium thermal detector thermocouple thickness time-constant tion transmission ultimate sensitivity value of Wm visible watt wavelength Wavelength microns window