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Abstract
The solar grating spectrometer is an essential tool to study the thermodynamics properties of the solar atmosphere with different height distributions, but its imaging performance will be degraded by the wavefront aberration generalized by the atmospheric turbulence. On the other hand, the narrow slit of the grating spectrometer will filter the wavefront aberration to some extent. The influence of the filter slit on the wavefront aberration and the correction requirement of the adaptive optics are analyzed theoretically and experimentally. We demonstrate that the influence of filter slit on the different types and magnitudes of wavefront aberration is different, and the RMS value of the wavefront aberration less than 0.3λ is down to below almost 60% after the filter slit, and it can lower the correction range requirement of the adaptive optics. The numerical simulation and experiment results show that: after the adaptive optics correction, the influence of the wavefront aberration on the spectral resolution is neglected, and the energy utilization is considerably improved; both numerical simulation and experiment results are in good agreement.
Highlights
It is well known that the evolving magnetic field causes the solar atmosphere eruption, and it produces most ofHow to cite this paper: Zheng, L.H., Rao, C.H., Gu, N.T. and Qiu, Q. (2015) The Influence of Filter Slit on the Imaging Performance of the Solar Grating Spectrometer Based on Adaptive Optics
The imaging performance of the grating spectrometer installed in the ground-based solar telescope is limited by the wavefront aberration [6] [7], i.e. the dynamic wavefront aberration generalized by the atmospheric turbulence and the static wavefront aberration of the optical system
It is apparent that the wavefront aberration needed to be corrected becomes smaller after the filter slit, the filter slit can lower the requirement of the Adaptive Optics (AO) correction
Summary
It is well known that the evolving magnetic field causes the solar atmosphere eruption, and it produces most of. (2015) The Influence of Filter Slit on the Imaging Performance of the Solar Grating Spectrometer Based on Adaptive Optics. Real-time observation and forecast of the solar atmosphere activities are very important since the violent activities of the solar atmosphere and period variation will influence the living environment of human being, and the imaging grating spectrometer is an important tool to achieve this goal [3]-[5]. It can perform the imaging observation, and can perform the spectral observation and identify the thermodynamics parameters of the solar atmosphere by the spectral information, such as the magnetic field, pressure and element abundance. This paper is organized as follows: in Section 2, the influence factors of the imaging grating spectrometer are analyzed; in Section 3, the numerical simulation is performed and is validated experimentally; in Section 4, the conclusions are summarized
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