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A method of using ccd detectors for astrometric telescopes to accurately measure the positions of stars

A technology of astrometry and precise measurement, applied in photogrammetry/video metrology, measuring devices, instruments, etc., can solve problems such as low efficiency, fuzzy electrical signals, and large photoelectric conversion losses

Inactive Publication Date: 2017-03-01
NAT ASTRONOMICAL OBSERVATORIES CHINESE ACAD OF SCI
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Problems solved by technology

Due to the large photoelectric conversion loss of this method, the quantum efficiency is only 26%, and the finally obtained electrical signal is relatively blurred and unclear. In addition, this method requires special equipment to record the moment of the star image, and it needs to be processed in the later stage. Get the end result, inefficient, bulky, complex systems that require specialized maintenance

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  • A method of using ccd detectors for astrometric telescopes to accurately measure the positions of stars
  • A method of using ccd detectors for astrometric telescopes to accurately measure the positions of stars
  • A method of using ccd detectors for astrometric telescopes to accurately measure the positions of stars

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Embodiment Construction

[0028] figure 1 The overall operation steps of the present invention are as follows: firstly, the selection of the CCD detector, followed by the installation and control of the CCD detector, then the automatic focusing of the terminal, and finally the data processing of the observed astrology.

[0029] Selection of CCD detectors: Different astrometric instruments will choose different CCD detectors according to different needs. For an astrometric instrument with a focal length of F, according to the formula C=L / F*206265, the CCD pixel unit size L can be obtained under the premise of specifying the scale C.

[0030] For example, since the speed of the earth's rotation is 15 arc seconds / S, and the elongated distance of the astrological image on the CCD photosensitive plate in one second is 15 arc seconds, and the exposure time is 0.5 seconds, the final elongated distance of the astrological image on the panel is 7.5 arc seconds. In the data processing, the position calculation...

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Abstract

The invention provides a method for accurately measuring the position of a fixed star by an astrometry telescope through a CCD (Charge Coupled Device) detector. The method specifically comprises the following steps: selecting the CCD detector used on a full-automatic astrometry instrument terminal, mounting and utilizing the CCD detector, utilizing an automatic focusing principle and an automatic focusing method of the CCD detector and accurately measuring the position of the fixed star by using a picture photographed by the CCD detector. According to the method provided by the invention, the measurement work of the position of the fixed star can be carried out on the astrometry telescope by using the CCD detector; the observation efficiency is improved, the structure is simple and the utilization is convenient; the method can be popularized and applied to the astrometry telescope.

Description

technical field [0001] The invention relates to the field of astronomical observation, in particular to the measurement work of astronomical time and latitude in astrometry. Background technique [0002] Astrometry is a method of astronomical observation. It obtains information such as the high-precision position of celestial bodies through measurement, which will be used in the research of Earth Rotation Parameters (ERP), geodesy, etc. The detector is one of the important devices in the observation instrument. The photons collected by the telescope can be objectively collected and used only after being recorded by the detector. The recording terminals of traditional astrometric instruments in our country are basically on the focal plane. The measured star passes through the grating, is received by the photomultiplier tube, passes through the AC and DC amplifiers, and then is saturated and amplified. The time when the star passes a certain point is recorded by the counter. ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C11/00
CPCG01C11/00G01C21/02
Inventor 田立丽王政王博
Owner NAT ASTRONOMICAL OBSERVATORIES CHINESE ACAD OF SCI
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