Labels:crt screen | monitor | web site | window OCR: SCSI "Data test2 Details 120% Text se lection Plain EBUPCF he thermal sensitivity IS then set by the minimum detectable temperature (the smallest change temperature that can be seen) which given where T is the post- detection time constant (integration time). In this case we can identify as being the time per pixel integration, or the 'dwell -time' for scanned beam. We can therefore link this to the rate of beam scan and the effective spot size of the beam. Here we can consider rotating aperture (mirror) of diameter Using the Gaussian beam methods that have become standard for mm -wave optics, we can say that the beam width parameter Wo, at this aperture should be chosen so that Wo D/3 This produces far- field Gaussian beam angle value of Tf Wo Wo where the signal frequency and is the spee ...
