LIBS-MS combined substance detection system in planetary open environment

Abstract

The invention discloses an LIBS-MS combined substance detection system in a planetary open environment. The LIBS-MS combined substance detection system mainly comprises a main controller, an MS module, an LIBS module, a mass spectrum coupling module an auxiliary module. The LIBS-MS combined substance detection system has the beneficial effects that plasma particles induced by an LIBS laser deviceare efficiently transmitted into an MS by virtue of planetary atmosphere as carrier gas and a siphon effect of a capillary tube and are analyzed; a time-of-flight mass spectrometer structure is adopted in a mass spectrum module, so that the drawback that auxiliary gas is required by an ICP is avoided; and a spectrograph is combined with an ICCD detector through a CT structure, so that weak femtosecond LIBS signals can be detected, and the spectrograph can meet the optical mass spectrum reuse requirement of a femtosecond laser device.

Description

technical field [0001] The invention relates to a material detection system, in particular to a material detection system using LIBS combined with MS optical mass spectrometry, which is suitable for material detection in the open environment of deep space detection of planets, and belongs to the field of in situ detection of planets. Background technique [0002] So far, the technology of mass spectrometry detachment with laser is mainly LA-ICP-MS, that is, laser ablation (laserablation, LA) inductively coupled plasma mass spectrometry, laser is used for detachment and stripping, inductively coupled plasma mass spectrometry (inductively coupled plasma mass spectrometry) , ie ICP) for ionization, mass spectrometry (mass spectrometry, ie MS) for particle analysis. This technology is only in a closed laboratory environment, using a specially manufactured sample delivery chamber to efficiently send the laser-desorbed particles to the mass spectrometer for analysis. Using the LA...

AI Technical Summary

Problems solved by technology

[0004] Secondly, the ICP in ICP-MS adopts the method of arc heating and inert gas delivery, which requires high pressure and auxiliary gas cylinders, which is difficult to meet the needs of deep space planetary exploration. Therefore, ICP-MS is not suitable for mass spectrometry analysis;

[0005] Furthermore, the adoption of high repetition frequency deep ultraviolet and femtosecond laser sources can effectively reduce the fractionation effect of mass spectrometry, make the ablation holes smooth and detach particles smaller and more uniform, which is an excellent laser source for detachment; but for LIBS In terms of ultra-short femtosecond pulses, the particles ablated at high temperature have no thermal effect of heat accumulation, which makes the LIBS signal much weaker than that of conventional nanosecond lasers. In addition, high repetition rate lasers are not suitable for LIBS;

Images