Optical system of the Infrared Telescope in Space.
A 15-cm Ritchey-Chretien telescope with diamond-turned metallic mirrors has been developed for use in the cryogenically cooled infrared space mission, Infrared Telescope in Space (IRTS). The IRTS is designed to register infrared emission from 1 µm to 1 mm with a relatively wide beam (8' to 30' depending on the wavelength). It will be operated at superfluid helium temperatures (~ 1.8 K). We tested the performance of the telescope system both at room temperature (~ 300 K) and at near-liquid-nitrogen temperature (~ 100 K) to investigate the effects of the support stress and the temperature on the telescope. The results indicated that the Hartmann constant stays within the design goal (~ 1') even in the worst case. The origin of aberrations is examined and possible improvements for future application are discussed.
Onaka
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Yagi
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Shibai
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Murakami
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Tanabé
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Kohno
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