Superfluid Helium Tank

TELESCOPE WITH SCIENTIFIC INSTRUMENTS + STAR SENSOR

Figure 7.24. Schematic design of ISO. Courtesy of ESA.

5.2 ^m, and a long wavelength (LW) channel covering 4 ^m to 17 ^m. Each channel contained a 32 x 32 pixel IR detector array, fixed filters, continuous variable filters (CVF) with a resolving power of AA/A = 40, and a set of magnification lenses giving angular resolutions of 1.5", 3", 6", and 12", respectively. These effective pixel sizes, however, neglect diffraction effects, which can become very significant at longer wavelengths for a telescope with this small mirror size. The calculated diffraction-limited resolution is 2" at 2.5 ^m, and 13.6" at 17 ^m.

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