INFRARED TECHNOLOGY

INFRARED TECHNOLOGY AND RAMAN SPECTROSCOPY INFRARED TECHNOLOGY [Pg.191]

Kirk-Othmer Encyclopedia of Chemical Technology (4th Edition) [Pg.191]

Because NEP is roughly proportional to Ak, D is more useful for comparing detectors of differing sizes. D depends on the wavelength distribution striking the detector (if it is quantum) and the frequency at which the radiation is modulated, so these measurement parameters need to be included for a D value to have meaning. Often detectivity is written as D (T/ ), where T is the temperature of the blackbody source of radiation or the wavelength of the monochromatic radiation,yis the modulation frequency, and b is the bandwidth of the measurement (10,11). [Pg.193]

Hg1 CdJTe is an example of a ternary detector, in which the value of x controls the cutoff wavelength. Photoconductive detectors are generally simpler to couple to low noise amplifiers photodiodes generally have lower power consumption because these have no external bias, and better high frequency performance (15,16). [Pg.193]

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