Photoelectric grating spectrometer aberration detection and correction of a breakthrough

Recently, the research team at the Institute of Optics and Electronics of the Chinese Academy of Sciences has theoretically analyzed the influence of wavefront aberration on spectral broadening and energy utilization of a grating spectrometer, and proposed a solar grating spectrometry method based on a dual-wavefront sensor adaptive optics technology.

Influence of aberrations on the spectral resolution of grating spectrometer

Grating spectrometer is an important tool to study the basic physical reaction of solar atmosphere. It can be used to determine the thermodynamic parameters such as magnetic field, temperature, pressure and element abundance during physical reaction. As one of the important instruments at the back end of the solar telescope, it is an effective means for scientific research and applied research on scientific observation of solar activity and space weather forecasting and prediction.

Influence of Kolmogorov Turbulent Phase Screen on Spectral Profile of Grating Spectrometer

However, the spectral imaging performance of Grating Spectrometer based on the ground-based solar telescope is severely restricted by the dynamic wavefront aberrations caused by atmospheric turbulence and the static aberrations in the optical system. The spectral resolution and the energy utilization rate are limited, and the large-diameter foundation The solar telescope should have high spatial resolution, high spectral resolution and high light-gathering ability. The traditional adaptive optics integrated into the telescope system can only correct the beam dynamic wavefront aberration before entering the grating spectrometer and can not achieve the whole system aberration detection and correction.

Based on the current development status of the GNSS Grating Spectrometer and the advantages of adaptive optics technology of Photoelectricity Institute, the research team of Optoelectronics analyzed theoretically the influence of wavefront aberration on spectrum broadening and energy utilization rate of Grating Spectrometer, Sun-grid spectral measurement method using dual-wave front-sensor adaptive optics: A Hartmann wavefront sensor is introduced by conjugating at the focal plane of the spectrometer, the wavefront aberration is measured by a two-wavefront sensor, and two A wavefront probe detected data fusion to produce the corresponding correction control signal, in order to achieve the entire optical system dynamic wavefront aberration and system static aberration correction, improve the spectral imaging spectrometer spectral performance. Simulation and experimental results verify the feasibility and effectiveness of the proposed spectrometer.


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