Abstract:
A main mirror for a reflecting telescope comprises a plurality of individual polygonal reflecting elements (1 to 11) and positioning and adjusting elements (12) connected thereto. Prior art main mirrors of this type have a poor capacity for transmitting point images and for modulation and are unsuitable for use in the infrared region, because the positioning and adjustment elements, in particular the measurement sensors arranged in the region of the separating lignes between the individual polygonal reflecting elements (1 to 11) emit interfering thermal radiation. Furthermore, the polygonal reflecting elements (1 to 11) of prior art main mirrors (20) are expensive to manufacture. In order to remedy these drawbacks, the reflecting surface forms a complete circle by means of connecting reflecting elements (1 to 8) connected radially to the outer edges of the polygonal reflecting elements (9), the reflecting elements (1 to 11) are made from a lightweight preformed material, and the positioning and adjustment elements (12) are arranged below the reflecting elements (1 to 11).
Abstract:
Reflector telescope, consisting of a tube (2) disposed in a spherical casing (1) and an outer framework (4) in which the spherical casing (1) is mounted. In known reflector telescopes, the tube is rotatable about its polar and declination axis, requiring two different driving systems. Moreover, access to the spherical casing is variable according to the position of said casing. These disadvantages are avoided by mounting the spherical casing (1) within the outer framework (4) to rotate about a horizontal axis (8), and by mounting said framework on a base to rotate about a vertical axis (50). Fixed and permanent access to the spherical casing (1) and therefore to the tube (2) is thus ensured, and the provision of a driving force for the spherical casing (1) is easily achieved.
Abstract:
A double reflector system has two spaced apart primary mirrors oriented towards a common focal point. The optical system further has two separate secondary deflector mirrors, as well as tertiary deflector mirrors, for concentrating the beam on a common focal point. Both the primary mirrors and the secondary deflector mirrors are so-called off-axis reflectors, i.e. their surface represents sections of the surface of a large, aspherical, hypothetical mirror body. The primary mirrors, as sections of the surface of a large, hypothetical hyberpolic mirror, are inclined at an angle to the common optical axis and are located at a predetermined distance therefrom, so that the inner marginal rays of the incident radiation that lie nearest to the optical axis converge. The primary mirrors of over 8 m in diameter must be formed of individual segments coupled to the corresponding segments of the secondary deflector mirrors that lie opposite to them in the path of the rays by a high-precision, computer-assisted measurement system, so that each deviation of the position of the segments of the primary mirrors may be effected by actuators by a real time corrective displacement of the corresponding, opposite segments of the secondary deflector mirrors.
Abstract:
A double reflector system has two spaced apart primary mirrors (5, 7) oriented towards a common focal point (1). The optical system further has two separate secondary deflector mirrors (2, 3), as well as tertiary deflector mirrors (6) for concentrating the beam on a common focal point (4). Both the primary mirrors (5, 7) and the secondary deflector mirrors (2, 3) are so-called off-axis reflectors, i.e. their surface represents sections of the surface of a large, aspherical, hypothetical mirror body. The primary mirrors (5, 7), as sections of the surface of a large, hypothetical hyperbolic mirror, are inclined at an angle to the common optical axis and are located at a predetermined distance therefrom, so that the inner marginal rays of the incident radiation that are nearest to the optical axis converge. The primary mirrors (5, 7) of over 8 m in diameter must be formed of individual segments coupled to the corresponding segments of the secondary deflector mirrors (2, 3) that lie opposite to them in the path of the rays by a high-precision, computer-assisted measurement system, so that each deviation in the position of the segments of the primary mirrors (5, 7) may be effected by actuators by a real time corrective displacement of the corresponding, opposite segments of the secondary deflector mirrors (2, 3).
Abstract:
A mirror telescope comprises a primary mirror the surface of which is shaped like the surface of a reference circle of a large, hypothetical, rotationally symmetrical mirror, so that the optical axis parallel to the path of the incident light beam, the focus of the primary mirror and the focus of the large mirror are identical. The primary mirror or the surface of the reference circle are adjacent to the optical axis, and therefore all the optical and mechanical accessories to be mounted in the region of the focus can be arranged outside the region of incidence of the light and of the field of reflection, without the need for optical correction devices.