Dissertation > Excellent graduate degree dissertation topics show

Study of Interrelationship between Laser-Induced Plasma Radiation and Ambient Atmosphere

Author: ZhangXiaoPing
Tutor: ChenJinZhong
School: Hebei University
Course: Optics
Keywords: Laser-induced plasma The atmosphere Radiation intensity Enhancement Soil
CLC: TN241
Type: Master's thesis
Year: 2008
Downloads: 18
Quote: 0
Read: Download Dissertation

Abstract


In this paper, high-energy neodymium glass laser (0-25J), the automatic scanning multi-functional combination grating spectrometer and a CCD detector and delay systems and computers spectral acquisition software to constitute laser spectroscopy system, as ablation to the national standard soil samples, study the atmosphere of the laser-induced plasma radiation characteristics. The main contents include the following aspects: 1. Spatial distribution characteristics of high-energy laser-induced soil plasma radiation. The different types of high-pressure atmosphere, the laser-induced plasma radiation intensity, spatial distribution of electron temperature and electron density. It was found that in different ambient gas, the plasma radiation characteristics are significantly different, having a different degree of restriction effect of gas pressure and gas species on the plasma expansion. Laser-induced melting points to enhance the effect of the plasma radiation. Single-pulse laser with high-energy neodymium glass laser output repeated the role in the same position of the surface of the soil samples, the sequence of laser pulses formed under the plasma emission spectroscopy, plasma-like crater morphology acquisition, preliminary inquiry laser-induced melting hole plasma radiation enhanced the internal mechanism. A different atmosphere on the plasma radiation was found, different kinds of environmental gas plasma formed by the sequence of single-pulse laser radiation intensity and spectrum of the letter back than to have a significant impact. 3 sample preparation conditions on laser-induced soil plasma radiation. Experimental study of the target sample of soil under different preparation conditions of the laser-induced plasma radiation. With the improvement of the pressure exerted by the sample preparation, plasma radiation intensity and spectrum of the letter back ratio has improved to varying degrees; enhance even more delicate surface of the sample size, the plasma radiation effect is more obvious. At the same time, the experimental results show that the ambient atmospheric pressure plasma radiation. Laser-induced plasma spectrometry in quantitative analysis. Spectrum quantitative analysis based on the calibration curve method. As the target sample to the national standard soil sample series, drawing the calibration curve, the measurement of the sample elements Mn content. Ar, N2 and CO2 gas three ambient gas, the relative standard deviation (RSD) of five measurements were 9.095%, 6.428% and 11.093%, relative error (RE) elements content was measured at 3.093% -14.021 %, within the range of from 2.784% -19.072%, and 4.124% -17.732%. The results show that there is a good linear relationship between the line intensities and element content.

Related Dissertations

  1. Study on the Improvement Depth of Dynamic Consolidation by Methods of Mathematical Physics,TU472.31
  2. Rebellion of an and Shi and Poetic Style Evolution from Kaiyuan to Tianbao,I207.22
  3. Research of Images Enhancing Algorithms on Fog or Backlighting Conditions and Implementation with Hardwares,TP391.41
  4. Research on Remote Sensing Image Processing Combining High Fidelity Compression and Resolution Enhancement,TP751
  5. Application Research of Digital Image Processing on Container Inspection,TP274.4
  6. Effect of Soil Erosion on Soil Quality in the Cultivated Slope Land on the Loess Plateau, China,S157.1
  7. Cloning, Expression and Functional Analysis of STOP1 Transcriptional Factor,S336
  8. The Value of High Resolution CT and Enhanced Spiral CT in the Diagnosis of Solitary Pulmonary Nodule,R816.4
  9. Effects of the Exotic Invasive Plant Solidago Canadensis L. on the Community Structure of Soil Anmals,S451
  10. Lijiang River,RS and GIS - based Soil Erosion Research,S157
  11. Activation of Polycyclic Aromatic Hydrocarbons in Soils by Root Exudate and Its Components,X53
  12. Study on Nitrogen Removal by Soil Aquifer Treatment Process That Enhanced Nature Reoxygenation and Effective Volume,X703
  13. Risk Analysis and Mitigation Experiment of Heavy Metal Pollution in Croplands in Vicinity of Pollution Sources,X820.4
  14. Subarea Management of Tobacco Soil Nutrients and Adequate Fertilization Research by Micro Scale,S158
  15. Soil Organic Carbon Fractions and Its Dynamic in Different Soil Types of Wuyi Mountains,S153.6
  16. Research on Rainfall Erosivity in Jiangsu Province,S157.1
  17. Effect of Black Carbon Addition on Soil Organic Carbon Decomposition,S153.6
  18. A Research on Determinating Soil Types and Soil Boundaries under Chinese Soil Taxonomy,S155
  19. The Comprehensive Evaluation of Flue-cured Tobacco Origin Place Environment and Tobacco Leaf of Fangxian,S572
  20. Theanalysis of Harmfulness Factors about Heavy Metals in the Course of Beef Cattle Feeding,S823
  21. Effects of N Addition on Soil Soluble Nitrogen and CH4 Oxidation of Upland in Subtropical,S714

CLC: > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > Laser technology, the maser > Laser physics and basic theory
© 2012 www.DissertationTopic.Net  Mobile