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Additional info for Electronic circuits and tubes
The mechanism and band structure of various NEA photoemitters has been reviewed by Bell (1973) and Zwicker (1977).
6 11m) and HCN (337 11m). For most applications extreme sensitivity is not required, but for pulsed systems the speed of response is vital, and special pyroelectric devices have been developed with rise times faster than 1 nsec. Stotlar et al (1980) have described a detector with a rise time of about 30 psec, achieved by matching a strontium barium niobate, SBN, device to a 50 ohm resistor. Roundy et al (1974) have produced LiTa03 devices with similar response times. G3 r-- - - - I --~ I ... , ....
28) where a is the Stefan-Boltzmann constant and n the emissivity. these ideal conditions the NEP can be evaluated such that (16onkT SAM)! 32) However, unlike the thermal deVices, photon detectors do not have a flat spectral response, and they will only respond to photons of energy greater than the minimum energy E, required to excite the electronic transition. Hence, it is assumed that for hv ~ E, the quantum efficiency n is one; whilst if hv < E, n = O. 33) where EA is the photon energy of the signal radiation, and $B is the total background photon flux to which the detector is sensitive.