Tracking sun photoelectric servo circuit used in chromospheric telescope

Published:2011/4/28 21:01:00 Author:Nicole | Keyword: photoelectric servo, chromospheric telescope | From:SeekIC

This servo system is used to observe sun. The sunshine is projected onto a Φ50mm round image by optical lens, to fix a 3DU33 photosensitive transistor to the later light slit of AA' and BB', it requires the parameters of two tubes should be as nearly as possible, after 3DG6D differentail amplifier, it is modulated into AC 50Hz, then it is AC amplified. After phase-sensitive rectification, it will be changed into DC singal, it can avoid the zero drift of DC amplifier. The parameters of two 3DG6D also should be coincided, and they are put into the same copper cap. The photoelectric tracing precision of this circuit is 0.8arc-second, the electrical energy is provided by a 300W portable lamp transformer.



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