On-orbit calibration method for Mars substance analyzer based on elastic particle swarm optimization

Abstract

The invention discloses an on-orbit calibration method for a Mars substance analyzer based on elastic particle swarm optimization, and the method is based on a particle swarm optimization algorithm. The method comprises nine steps of the establishment of a simulation environment cabin and a standard lamp test, the establishment of a standard calibration equation, the establishment of a target material standard test, the establishment of a target material standard wavelength set, an on-orbit target material test, on-orbit spectral line peak searching, particle swarm generation, particle fitnesscalculation, particle evolution and the establishment of an on-orbit calibration equation. The method has the advantages that the wavelength fitting coefficient of an on-orbit LIBS spectrometer is solved by adopting an elastic matching fitness particle swarm optimization method, the accurate on-orbit correction of drift can be realized by virtue of evolutionary optimization of a large number of particles under the condition of large-scale drift of the spectrometer caused by a planet external field environment, therefore, the feasibility and accuracy of planet LIBS material analysis are guaranteed, and the method has extremely high environmental adaptability and is particularly suitable for spectral loads such as MarsCode which do not have sufficient energy for constant-temperature work. The particle swarm software algorithm provided by the invention can achieve the same precision effect as a constant temperature test under the condition of saving the energy supply cost.

Description

technical field [0001] The invention relates to a spectrometer calibration method, in particular to an on-orbit real-time calibration method for a laser-induced breakdown spectroscopy (LIBS) instrument based on elastic particle swarm optimization, which is suitable for LIBS spectrometer when analyzing the composition of LIBS planetary materials On-orbit spectral calibration belongs to the field of photoelectric detection. Background technique [0002] In the field of deep space exploration, laser-induced breakdown spectroscopy (LIBS) has been or is being used internationally to analyze the in-situ material composition of planets, especially the elemental composition. For example, the American Curiosity rover is equipped with a LIBS material composition detector, and in 2020, a new generation of Mars rover will also be equipped with a material composition detector jointly used by LIBS and Raman. The Mars rover to be launched by the China Space Administration in 2020 will be ...

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Problems solved by technology

[0005] However, when the LIBS material composition analyzer is launched to work in the Martian environment, the temperature range of the Martian environment is very wide (minus 150 degrees Celsius to plus 50 degrees Celsius), and the operating temperature range of the instrument is also very wide (for example, the working temperature of MarsCode is minus 50 degrees Celsius to plus 30 degrees Celsius). , will inevitably lead to the wavelength shift of the spectrometer

Moreover, China's 2020 Mars rover is powered by solar energy, and there is not enough heat energy to maintain the temperature stability of the spectrometer and other optical structures. Affected by the temperature and environment of Mars, wavelength drift is inevitable. track correction

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