Development Of Analysis&Test Software And Research Of Qualitative Analysis Methods For Laser-induced Breakdown Spectroscopy

Laser-induced breakdown spectroscopy technology is a new analysis method inthe field of spectroscopic. Its unique characteristics made it become remote, real-time,non-destructive and multi-element simultaneous detection. It has showed a hugeapplication potential in biology, medicine, industry, agriculture, military, public safetyand many other areas. With the deepening of basic theoretical research of LIBS andcontinues increasing of industry demand, equipment based on laser-inducedbreakdown spectroscopy has begun to enter the market.Analysis and test of software is an important and indispensable part of thelaser-induced breakdown spectroscopy instruments. The software can effectivelyguide the user to accomplish the spectral acquisition, reduce the trouble of manuallyoperating the individual instrument parts, and avoid equipment failure caused byimproper manual operation, which improve work efficiency. The efficient andaccurate spectral data processing method is introduced into the software to achieverapid analysis, not only convenient for the user to directly see the results, but alsoimprove the site online testing technology. As the traditional analysis method is firstacquisition and then processing, which is timeliness inadequate. Changing thetraditional method is to meet the needs of industrial development, which is definitelyof great significance.This paper worked on the development for analysis and test of software andresearch of a qualitative analysis ways, the main contents are as follows:(1) Design of analysis and test software architecture.When the requirement is fixed, the design and development of software needn’tto consider software architecture at all. As long as it implements specified function,the software can be used continuously. However，analysis and test software requiresversatility. With the upgrade of hardware and the improvement of data increasing orprocessing methods, the functional requirements of software will change, whichinevitably need to make changes to the code. To allow developers to read programcode more easily, to better locate where you want to modify the code and to minimizethe code need to be modified, we proposed an analysis and test software architectureto be MVC, which is based on the study of the classic three-tier architecture. Through software stratifiing, weakened dependency between layers and made the system notcomplex as before. In addition, for predictable changes, studied the plug-inmechanism, and integrated it into the MVC architecture. The extensible functionalmodules have been isolated from the software architectures with the form of plug-in.Correspondence between functional modules and plug-ins is defined used the form ofconfiguration files, which enhanced the extensibility of functional modules and makesecondary development of software possible.(2) Research of qualitative analysis methods for LIBS.The errors will be inevitably produced in the process of the spectral acquisition,and the datas are always mixed with a lot of interference information, the difficulty ofthe spectral data analysis will be increased. Through analysis for background andnoise source of LIBS data, spectral data preprocessing method is studied. In order toimprove search LIBS peak resolution of overlapping peaks and adaptive capacity,proposed one kind of automatic peak search method for LIBS spectra. The ridge peaksearch method based on continuous wavelet transform was introduced into the LIBS,the choice of mother wavelet for continuous wavelet transform was discussed, thescale parameters and translation parameters were optimized. A method for correctingridges was proposed to improve ridge peak search method. Test results shows that thismethod has a significant advantage for resolution of overlapping peaks and peaksearching precision compared to the direct comparison method, derivative method andthe ridge peak search method. Studied element identification method based on cosinesimilarity, and tested the developed analysis and test software, correctly identified themain elements component in Cu sample.(3) Implement of analysis and test software.According to the functional requirements in needs analysis, three majormodules including data collection function, data analysis function and datamanagement function were designed and developed. Each module separately analyzedand implemented from the view layer, the controller layer and model layer. Viewlayer is responsible for maintaining the graphical user interface, providing accesshuman-computer interaction; The controller layer is responsible for distributing andmonitoring between the view layer and model layer, which is the core of softwarecontrollment, but not involved in the actual business operations; Model layer isresponsible for handling business logic to complete specific tasks, showing the corevalue of the software. The model layer has been divided into initialization module,plug-in management module, the device management module, parameter analysismodule, rule check module, the data module, process control module, the spectrumoperation module, data analysis module and a data access module and so on.Developed a hardware device’s operating methods, parameters and event processingrules on the inflow and outflow data software specifications; draw the hardware devices state transition diagram; designed spectral data collection workflow to meetthe LIBS experiments, by calling the hardware interface and detecting hardwaredevices’ state to achieve the orderly collection; To achieve a friendly interaction,used event handling mechanism update user interface in real time to show theprogress situation.(4) Research of storage format for LIBS spectral data.Taking the advantages of the GAML standard, we introduce the the GAMLstandard into the LIBS analysis software. With the study of storage format of theGAML standard, we could save the original spectral data that collected from the LIBSinstrument as the GAML file, store the processed spectral data which contains thespectral peak information in the form of the GAML file, and achieve the storage andanalysis of the GAML format by software programming.In short, LIBS analysis and testing of software development has importantpractical significance, can effectively solve the domestic LIBS instrument softwaredevelopment ubiquitous software systems maintenance inconvenient, difficult toextend, customize functionality issues such as inadequate, can quickly adapt tochanges in demand, a substantial increase efficiency of software development.Thereby promote the development of LIBS instrumentation and technologyapplications fast forward in our country.