Measuring device and correction method for wavelength drift in different fields of view of narrowband optical filter

Abstract

The embodiment of the invention relates to a measuring apparatus and correction method of wavelength drift in different view fields for a narrowband light filter. The correction method of wavelength drift in different view fields for a narrowband light filter includes the steps: cutting-in a scaling light source and a diffusion sheet into an optical path on which the narrowband light filter is; scanning the spectrum of the scaling light source through the narrowband light filter; according to the spectrum of the scaling light source, determining the wavelength drift in different view fields for the narrowband light filter; shifting out the scaling light source and the diffusion sheet from the optical path; scanning the spectrum of an observation target through the narrowband light filter; and according to the wavelength drift in different view fields for the narrowband light filter, calibrating the spectrum of the observation target, and obtaining the real spectrum and the velocity field information of the observation target. The measuring apparatus and correction method of wavelength drift in different view fields for a narrowband light filter can be used for small-bore and large-view-field sun observation of space and ground base, such as a full solar disk photosphere and chromosphere image, can also be used for coronagraph observation of space and ground base to finally realize accurate background calibration of wavelength and velocity field, and can be used for small-bore and large-view-field remote sensing to earth, based on the narrowband light filter.

Description

technical field [0001] The invention relates to the field of remote sensing imaging, including remote sensing imaging of ground or astronomical targets, and in particular to a measuring device and correction method for wavelength drift of different fields of view of narrow-band filters. Background technique [0002] In the field of remote sensing observation, such as space-to-Earth observation or space-based and ground-based astronomical observation, narrow-band imaging observations are often carried out on a certain absorption line or emission line with a narrow-band filter to obtain more abundant information about the observation target. For example, in solar observation, the continuum of visible light bands is formed in the photosphere. If you want to observe the upper atmosphere of the sun such as the chromosphere, you can only observe near the line center of the chromosphere absorption line. [0003] Most narrow-band filters such as narrow-band interference filters, Lyo...

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Problems solved by technology

[0005] However, for solar observations with large apertures and small fields of view, such as full-helioscopic photosphere or chromosphere, and coronal observations, it is impossible to calculate the wavelength shift caused by different fields of view of narrow-band filters

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