Research Of Satellite-Borne High Precision Solar Irradiance Spectrometer Wavelength Scanning Mechanism

Satellite-borne high precision solar irradiance spectrometer is one of the most important facilities in studying solar radiation,wavelength scanning mechanism of which dramatically determines the final measurement result.As an important part of National Natural Science Foundation,this article investigated the wavelength scanning mechanism of a satellite-borne high precision solar irradiance spectrometer,and finished the following work:1.Research and application of satellite-borne solar irradiance spectrometer was investigated.The cam mechanism was replaced by the screw mechanism so that the new demand of precision and repeatability could be realized.2.Stepping motors and bearings were chosen based on the design of wavelength scanning mechanism.Allowance analysis and lifetime analysis were done to make sure that all elements were proper.3.Grating shaft was analyzed and optimized to reduce the deformation and vibration of concave gratings.Parameterization in UG and goal driven optimization in ANSYS workbench were combined so that all targets,such as centroid adjustment,rigidity enhancement,light weight and vibration resistance could be realized at the same time.4.The method of error analysis was improved.First,the wavelength formula was derived according to dispersion principle and geometrical relationship.Then,relationship between measurement result and each parameter was analyzed.Finally,precision of the wavelength scanning mechanism was calculated based on principle of superposition.5.Wavelength was calibrated on the prototype to check the method of precision analysis.Zero error was assessed by measuring straightness accuracy and a new way of fine tuning was proposed based on that.6.All tasks were concluded,and some other research and application of this project was discussed.