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Manufacture of Φ600 R-C optical system

In the field of space flight, aviation and astronomy, R-C (Ritchey-Chretien) camera composed by two hyperboloid mirrors is one of the main instruments for detection and photography. A R-C system has been designed, which is composed of a primary mirror with clear aperture of Φ0 = 600 mm, radius of curvature of 1440 mm, conic constant k1 of-1.00486, relative aperture A1 of 1/1.2, lightweight ratio of 53%; and a secondary mirror with clear aperture of 12-92 mm, curvature radius of 236.2 mm, conic constant k2 of-1.66923. Therefore, the focal length of the R-C optical system is 6000 mm, and the relative aperture A is 1/10. Based on classical methods, the new testing methods have been developed. The R-C optical system has been tested by both classical and new test methods, the measurement results have been compared with a perfect agreement. The manufacture precision of the secondary mirror includes the spot diaphragm with a diameter of 0.02mm in size and PV 0.12λ (λ=0.6328μm) of wavelength. The spot diaphragm's size of the primary mirror is 0.02mm. The spot diaphragm's size of the system is 0.02mm, RMS is 0.18λ and PV is 1.2 λ measured by WYKO laser interferometer. Because it is used in infrared wave band, this optical system has already met the designed technical data perfectly. The R-C optical system has been checked and accepted by the user.