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Online calibration method of tunable filter for solar observation

A calibration method and filter technology, which are applied in the field of solar optical observation, can solve problems such as affecting solar radiation intensity, and achieve the effect of reducing requirements, reducing weather conditions, and improving calibration accuracy.

Active Publication Date: 2018-09-04
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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Problems solved by technology

On the one hand, even on a clear day with no visible clouds, there may still be thin clouds that are difficult to distinguish with the naked eye, which will affect the intensity of solar radiation; The thickness of the atmosphere is different, and the sunlight intensity will change with time in a day, which has a great influence on the calibration of tunable optical filters, especially the multi-sampling point calibration in a wide spectral range that requires a long time

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  • Online calibration method of tunable filter for solar observation
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  • Online calibration method of tunable filter for solar observation

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0033] Based on the seven-band tomographic imaging system of the 1m new vacuum solar telescope of Yunnan Astronomical Observatory, the mechanically tuned lyot filter of the Hα band (center wavelength is 656.28nm) in the system is calibrated using the traditional method and this method respectively.

[0034] The first step: set the mechanically tuned lyot harmonic filter to be calibrated in the spectral range of and the scan step size is

[0035] Step 2: Set the acquisition frequency of the lyot filter imaging camera to 5HZ. The TiO band (center wavelength is 705nm) filter and its imaging camera are used as the reference light intensity recording system, and the acquisition frequency is set to 5HZ.

[0036] Step 3: Point the telescope system 1 to the center of the sun. Camera 3 separately collects each filter scanning wavelength λ k Corre...

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Abstract

The invention discloses an online calibration method of a tunable filter for solar observation. The online calibration method of a tunable filter for solar observation is composed of a telescope system (1), a filter to be calibrated (2), a camera (3), a reference light intensity recording system (4), a beam splitter (5), and a reflector (6). The tunable filter is widely applied to solar narrowbandspectral imaging observation, and requires regular on-line calibration. A traditional method performs imaging observation on a quiet area of the solar disk, and the change of solar light intensity during the calibration process may have a greater impact on accuracy of calibration of the filter. The online calibration method of a tunable filter for solar observation corrects the solar light intensity change caused by the non-solar atmospheric absorption phenomenon in the calibration process through real-time solar light intensity detection, and can effectively overcome the solar light intensity change during the long-term calibration process and weaken the influence of thin cloud on solar light intensity during the calibration process. The online calibration method of a tunable filter forsolar observation can be applied to online calibration of various tunable filters in solar observation, can significantly reduce the requirement for on-line calibration of solar light intensity stability, and can improve the calibration accuracy.

Description

technical field [0001] The invention relates to the field of solar optical observation, in particular to an online calibration method for a tunable optical filter applied to solar observation. Background technique [0002] The sun provides the necessary guarantee for the survival of all things on the earth. At the same time, the activities of the sun also directly affect the earth's climate, communication and many other aspects. In recent years, with the development of solar physics, space astronomy and other sciences, the research on the sun is no longer limited to the observation of single-band and imaging features, but further extends to the observation of the solar layered structure and the measurement of physical quantities. [0003] Because the line center and line wing of the sun at a specific absorption peak (wavelength) correspond to different height layers of the solar atmosphere (such as the 656nm wavelength line corresponds to the chromosphere, and The line win...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J1/02G01J1/42
CPCG01J1/02G01J1/42G01J2001/4266
Inventor 刘洋毅王佳饶长辉
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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