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Fixed astronomical telescopes are generally installed in astronomical domes or other observation rooms. After installation and commissioning, they are generally no longer easy to move. So what are the precautions in the installation and post-maintenance work? Today, the Avery binoculars will give you a brief introduction! Let's take a look!
1. Fixed device
The fixed astronomical telescope is stable and reliable, and the structure is complicated. It has a structure that can be firmly locked by adjusting its polar axis to the meridian plane (north-south plane), so as to ensure that the telescope's polar axis points to the north celestial pole stably and accurately. The mechanical devices used in the fixing devices are the most diverse. Among them, the German type, the fork type, and the horizontal type are widely used, but the German type is commonly used. The German-style device has the advantages of stable structure and convenient replacement of the lens barrel and receiver. These advantages are fully utilized in the fixed device.
Of course, for some reflecting telescopes and catadioptric telescopes, especially large telescopes with an aperture greater than 500mm, the fork structure is still very advantageous and widely used.
2. Rotating instrument clock of fixed telescope
Generally, the accuracy and automation of the rotating clock of fixed telescopes are quite high. The transmission system must be stable and reliable, and the final diameter of the worm gear (or gear) must be equal to the diameter of the telescope, and generally requires a larger modulus and higher accuracy. Pay attention to this when choosing. The telescope must have an automatic tracking system, and the right ascension and declination must be driven with slow motion and micro motion. From a reliable point of view, manual operation is more advantageous. However, with the popularization of computer technology, the rapid operation of the telescope must be electric when using a computer to find a star. Since the driving device of the fixed telescope does not have to worry about the power load, the synchronous motor, DC motor or stepper motor driving system is widely used.
3. Optical system of fixed telescope
In principle, all astronomical telescope optical systems can be used in fixed telescopes. However, fixed telescopes require high stability and have the most advantages for refracting telescopes. Such as:
①The optical axis is stable. The refractor lens is installed in a stable frame and will not change after long-term use.
②The light transmittance is not easy to change, and the service life is extremely long.
③The maintenance and decoration are relatively simple.
④More spectacular. In layman's terms, it looks like a large astronomical telescope.
⑤Under the same caliber, because it does not have an intermediate reflecting element, the amount of light passing is greater than that of a reflective or catadioptric telescope.
However, under the condition of the same caliber, the price of the refractor will be the highest, because the lens barrel is long and all other components have to be enlarged, and the cost is high. In addition, if the mirror is long, the observation room has to be large, which increases the construction cost.
In addition, the aperture of the refracting telescope used by ordinary units should not be too large, generally not exceeding 200mm. The maximum diameter of the refracting telescope that can be accommodated in the 6m dome is about 250mm. If a larger aperture is required, it is recommended to use a reflecting telescope or a catadioptric telescope.
