Deep-space micro-zone self-adaptive laser spectrum and imaging detection system

Abstract

The invention discloses a deep-space micro-zone self-adaptive laser spectrum and imaging detection system. The system is composed of a main controller, a spectrometer, optical fibers, a three-dimensional motor driver, a three-dimensional precise electric platform, a digital pulse delay controller and an optical head. The self-adaptive laser spectrum and imaging detection system can self-adaptivelyadjust the diameter of the focused spot during the analysis of the micro-area, utilizes the regional average gray of an electronic eyepiece as the intensity of the scanned imaging spot, satisfies therequirements on self-focusing and wide-spectrum scanning imaging, realizes three-dimensional space LIBS elemental analysis, active laser Raman molecular analysis, hyperspectral fluorescence and visible wide-spectrum scanning imaging and provides a variety of information for micro-area fine detection.

Description

technical field [0001] The invention relates to a material detection system, in particular to a material detection system using scanning laser-induced plasma LIBS, laser Raman imaging, laser-induced fluorescence imaging and laser illumination area array wide-spectrum scanning imaging, which is suitable for deep space detection of planets The detection of matter in an open environment belongs to the field of in-situ detection of planets. Background technique [0002] For future deep space exploration, higher requirements are put forward for material composition detection technology and methods, and the in-situ fine detection capability is the highest point of technology aimed at by all aerospace powers. Fine detection requires a smaller laser focus point, a small amount of analyzed substances, more abundant elements and molecular types, more accurate quantification, and it is carried out under the monitoring of extremely high spatial resolution imaging. [0003] Laser-induce...

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Problems solved by technology

LIBS and Raman material analysis in deep space micro-area detection are more demanding than conventional laser spectroscopy applications. The main challenges and technical difficulties are that due to the complex composition of minerals contained in rocks and soils, the same mineral particles Very small diameter

Therefore, in the micro-area analysis, the laser focus spot is required to be on the order of 1 micron, so that the minerals can be accurately analyzed in the micro-area, and the requirements for the microscopic optical path are extremely high. The spot is affected by the degradation of the laser mode and the diffraction limit, so the focused spot is often larger than 5 microns, which cannot meet the requirements; the combination of a free optical path, a short-wavelength laser, and a high-magnification, high-NA microscopic objective can theoretically obtain extremely Small focusing spot, but because the focusing depth of field is extremely small, it is necessary to find a suitable self-focusing scheme for micro-area analysis and three-dimensional structure analysis, and to ensure that the focusing spot size of each point is consistent and consistent with the design value. At the same time, if the self-focusing time Long, it will affect the scanning imaging speed

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