Dissertation > Excellent graduate degree dissertation topics show

Research of Laser Particle Sizer Based on Scattering Theory

Author: ShenShaoWei
Tutor: YanShuHua
School: National University of Defense Science and Technology
Course: Instrument Science and Technology
Keywords: Particle size distribution Mie scattering theory non-mode algorithm Light energy distribution matrix Steepest descent algorithm
CLC: TH744.5
Type: Master's thesis
Year: 2008
Downloads: 169
Quote: 1
Read: Download Dissertation

Abstract


Particle sizing is more and more important in areas as environment, energy sources and chemistry etc, while nowadays, the laser particle sizer based on scattering theory is widely used in the area of particle sizing, which has advantages as high precision, quick test, good repeatability, wide measuring range, non-touch test, high automatization, simple operation etc. System designing were made out on the hardware and software, and finally achieved and ameliorated the experimental system of laser particle sizer by deeply study of Mie scattering theory and the principle of laser particle sizer. The main contents includes:1、By study of Mie theory, the calculation model of intensity scattered function is set up as well as scattering light intensity distribution by various particles and refractive are obtained through computing.2、Hardware system of laser particle sizer is designed, which include optical system as well as data acquisition and processing circuit, the position of fourier lens and sample pool is changed while designing of optical system. Which reduced the cubage of the whole instrument but not reduce measuring range.3、Annulus parameters of annular detector and position parameter of large angle detectors are calculated strictly by Mie scattering intensity distribution and annular detector is designed and made out independently. Then, the mathematical model of optical system is set up, the basically dominant diagonal light energy distribution matrix obtained can make the result more stable, and serve the inverse processing later.4、Modal algorithm and non-mode algorithm are analysed detailedly, and the non-mode one is picked to mainly study. The combination of optimization algorithm and traditional distribution inverse algorithm is presented, which aims at the shortages that low antinoise ability of non-mode algorithm. The steepest descent inverse algorithm based on P-T theory is fixed which can avoid the huge error may bring by matrix inversion and also enhancing the precision and stability.5、Analysis software and its various functions are achieved to supply a simple and humanness operate panel.6、Abundance of repeated and comparable experiments are done by the experimental system, it indicates, the repeatable error of D5 0 is in 1% as well as good stability while avoid influences of sample dispersing. Finally, factors may bring error to the system are studied, and the precision as well as reliability of the system is improved by solving the main problems.

Related Dissertations

  1. Measurement of Spray Droplet Size Distribution and Information Entropy Analysis,TK407.9
  2. Preparation Method Study of Acetyl Cellulose Aqueous Dispersion,R944
  3. Study for the Influence of Additive and Processing Technique on the Densification of Zirconia Ceramics,TQ174.1
  4. Study of Light Scattering Characteristic of Submarine Suspended Particles,O436.2
  5. Low-coherence dynamic light-scattering particles in suspension measure particle size and size distribution,O436.2
  6. Study of Laser Granulometric Analysis Algorithm,O436.2
  7. The System Designing and Technology Researching about Rapid Detection of Milk,TS252.7
  8. Localized Surface Plasmon Resonance Properties of Noble Metal Nanoparticles,TB383.1
  9. Study on the Preparation Mechanism and Technology Development of Highly Effective Sorbent,X701.3
  10. Study on Grinding Mechanism of Disperse Milling Medium Dynamical for Vibration Mill,TH113
  11. Research on the Control Technology of Weld Line,TQ320.662
  12. Research on Forming Fume Influenced by Process Parameters in GMA Welding,TG444
  13. The Study on the Metric Suction of Unsaturated Clayey Soils,TU442
  14. The Design of Algorithm Applied in Adaptive Anti-jam Nulling Antenna Array,TN820
  15. Research on Light Scattering Techniques of Ultrafine Particle Size Measurement,TH724
  16. Preparation of high white aluminum hydroxide filler grade,TF821
  17. Research on High-pressure Water Mist Nozzle and Its Characteristics of Fire Suppression,TU892
  18. Development of automatic laser particle size analyzer,TP23
  19. Numerical Simulation of Wind-Blown Sand Saltation,O35
  20. Emulsifier Selection and Stability of Haloxyfop-R-methyl Emulsion Oil in Water,TQ450.62

CLC: > Industrial Technology > Machinery and Instrument Industry > Instruments, meters > Optical instruments > Physical optical instruments > Laser equipment
© 2012 www.DissertationTopic.Net  Mobile