OCA Alied Op, 7421 Orangeod Ave . , Garden Grov, (liforriia 92642Often it is not possible to fiix pairs of infrar refractive materials in the ,,v-v diagram1 jc design achranatic dciblets with focal distance theriil change, matching the expansion of the focal plane supporting structure. The probl solv1 with three refractive materials if they form a finite area triangle in the ;yV-V diagram. We derive formulas for the calculaticri of the pr of the elanents that include both the doublet aixI the triplet solutions.

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The formula for evaluation of narcissus equivalent temperature difference as a function of the scan angle in thermal imaging systems is made more meaningful by grouping the parameters in two factors: one depending on wavelength and temperature and the other, a function of the scan angle, depending on the geometry of the instrument. Exact ray tracing equations are used to evaluate the ratio of radiant energy reaching the detector from warm and cold areas of the instrument.

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An efficient algorithm for the computation of monochromatic and polychromatic diffraction in the region of the focus of a converging wavefront has been devised for the Perkin-Elmer RAY-GODE optical design computer program. The algorithm generates a digitized map of intensity over an area defined by the user. With this map energy distribution can be integrated in different ways. Also, the program plots an analog map which closely resembles photographs of so-called aerial images of artificial stars observed under a microscope.