Particle Sizing Using Laser Diffraction

Volume 1 ◽  
2004 ◽  
Author(s):  
Badih A. Jawad ◽  
Chris H. Riedel ◽  
Ahmad Bazzari
Keyword(s):  
Diesel Fuel ◽  
Drop Size ◽  
Diagnostic Technique ◽  
Droplet Size Distribution ◽  
Laser Diffraction ◽  
Particle Sizing ◽  
Line Measurement ◽  
Accuracy Of Measurements ◽  
Laser Diagnostic ◽  
On Line

The laser diffraction technique constitute an easy and fast on line measurement of drop sizes. Based on the well known theory of diffraction, a laser diagnostic technique is described for the measurement of droplet size distribution. Limitations of the technique are studied to identify accuracy of measurements when applied to dense sprays (i.e. diesel fuel). Drop size measurements are then conducted for different diesel fuel under different conditions of injection and chamber pressures. Results lead to better understanding of the atomization process.

On-Line Gauge for Wire and Fibre Diameter Measurement

1974 ◽  
Vol 7 (2) ◽  
pp. 45-46 ◽  
Author(s):  
Patricia West
Keyword(s):  
Output Signal ◽  
Size Range ◽  
Fibre Diameter ◽  
Laser Diffraction ◽  
Control Mode ◽  
Absolute Accuracy ◽  
Diameter Measurement ◽  
Line Measurement ◽  
On Line ◽  
Accuracy Of Measurement

A new gauge has recently been developed for on-line measurement of filament diameters in the size range 5–160 microns. The instrument, which operates on a laser diffraction principle, has been designed for non-contacting gauging of wires, filaments and fibres on the production line. It can accept horizontal or vertical wires, and it can readily be moved from one line to another, and used in the laboratory or test bay. The absolute accuracy of measurement attainable is approximately 1% of the diameter of the filament, while the sensitivity of the gauge to changes in diameter is about 0· 2%. The deviation from nominal diameter is displayed on a meter, or can be recorded automatically. It is possible to use the output signal from the instrument in a control mode to correct the diameter of the wire under production.

On-Line Calibration Technique for Laser Diffraction Droplet Sizing Instruments

1983 ◽  
Author(s):  
E. Dan Hirleman
Keyword(s):  
Gas Turbine ◽  
Laser Diffraction ◽  
Experimental Results ◽  
Fuel Spray ◽  
Particle Sizing ◽  
Calibration Standard ◽  
Calibration Technique ◽  
Imaging Methods ◽  
Spray Droplets ◽  
On Line

Laser diffraction (forward scattering) methods for sizing fuel spray droplets in gas turbine applications have been utilized for many years, but a continuing inconvenience with these and all particle sizing techniques is the problem of calibration. This paper discusses the use of photomask reticles to provide a simple, reproducible calibration standard for particle/droplet sizing instruments based on diffraction or imaging methods. Experimental results obtained with prototype standards are presented as well.

On-line Measurement of Particle Size and Shape using Laser Diffraction

2001 ◽  
Vol 18 (5/6) ◽  
pp. 243-247 ◽  
Author(s):  
Zhenhua Ma ◽  
Henk G. Merkus ◽  
Hilda G. van der Veen ◽  
Melvin Wong ◽  
Brian Scarlett
Keyword(s):  
Particle Size ◽  
Laser Diffraction ◽  
Size And Shape ◽  
Line Measurement ◽  
On Line ◽  
Particle Size And Shape

An On-Line Measurement and Control System for Submerged Arc Spray Synthesis of TiO2 Nanoparticles

2008 ◽  
Vol 8 (2) ◽  
pp. 503-509 ◽  
Author(s):  
Liang-Chia Chen ◽  
Bao-Hong Ji
Keyword(s):  
Control System ◽  
Measurement System ◽  
Particle Sizing ◽  
Measurement And Control System ◽  
Arc Spray ◽  
Line Measurement ◽  
On Line ◽  
And Control ◽  
Measurement And Control ◽  
Submerged Arc

This article presents the development of an on-line measurement and control system for process characterization and optimization of the nanoparticle manufacturing process, called the submerged arc-spray nanoparticle synthesis system (SANSS). To achieve optimized control of particle uniformity, this research investigates the feasibility of employing optical fiber probe and the dynamic light scattering (DLS) technique to monitor and control particle sizes. According to the theory of DLS, an on-line nanoparticle sampling and measurement system was developed and integrated with the SANSS as an important step to verify the measurement performance of the proposed method. To examine the measurement accuracy of the developed system, calibrated polystyrene latex particles with known accurate sizes were employed to verify the particle sizing accuracy of the proposed system. The data conformity between the measurement results of TiO2 nanoparticles obtained by various methods, including TEM, a calibrated commercial particle sizing system and the on-line measurement system, has indicated that the developed method was feasible and effective.

Particle Size Measurement Techniques: A Review Of Methods And Applications

2012 ◽  
Author(s):  
Mohd Fua’ad Rahmat ◽  
Teimour Tajdari
Keyword(s):  
Particle Size ◽  
Measurement Techniques ◽  
Particle Sizing ◽  
Size Measurement ◽  
Zone Method ◽  
Laser Scattering ◽  
Particle Size Measurement ◽  
Line Measurement ◽  
Wide Range ◽  
On Line

A number of particle sizing techniques are available to measure solid particles median size of nano–scale to centimeter. The techniques cover a wide range of applications in industries where the particle size information is an important parameter in manufacturing process. The particle size measurement (in terms of application) can be categorized into two groups, offline application and on–line measurement. On–line particle size measurement in pneumatic transporter is challenging area in terms of measurement condition, where particles flow homogeneity, humidity, velocity and concentration profile are directly affects the measurement results. All these parameters make difficult the instrumentation design. This paper highlights some of the important instrumentation in particle sizing based on their measurement principle. The measurement methods include physical methods, laser scattering based methods, Image based methods and electrical sensing zone method. In addition, the paper highlights recent innovative on–line measurement techniques used in particle size measurement. Key words: Sedimentation; sieving; laser scattering; phase–Doppler; morphology; coulter count; resonance frequency; optical tomography; electrostatic sensor

A new on-line measurement method for particle sizing

1995 ◽  
Vol 26 ◽  
pp. S761-S762 ◽  
Author(s):  
Cai Xiaoshu ◽  
Zheng Gang ◽  
Wang Naining ◽  
Zhang Hongwu
Keyword(s):  
Measurement Method ◽  
Particle Sizing ◽  
Line Measurement ◽  
On Line

Thickness Measurement in the AEM by Macintosh-Based Analysis of Two-Beam Convergent Beam Patterns

1990 ◽  
Vol 48 (2) ◽  
pp. 504-505
Author(s):  
John F. Mansfield ◽  
Douglas C. Crawford
Keyword(s):  
Electron Microscope ◽  
Video Camera ◽  
Thickness Measurement ◽  
Specimen Thickness ◽  
Crystalline Materials ◽  
Beam Dynamic ◽  
Line Measurement ◽  
On Line ◽  
Image Position ◽  
Convergent Beam

A method has been developed that allows on-line measurement of the thickness of crystalline materials in the analytical electron microscope. Two-beam convergent beam electron diffraction (CBED) patterns are digitized from a JEOL 2000FX electron microscope into an Apple Macintosh II microcomputer via a Gatan #673 CCD Video Camera and an Imaging Systems Technology Video 1000 frame-capture board. It is necessary to know the lattice parameters of the sample since measurements are made of the spacing of the diffraction discs in order to calibrate the pattern. The sample thickness is calculated from measurements of the spacings of the fringes that are seen in the diffraction discs. This technique was pioneered by Kelly et al, who used the two-beam dynamic theory of MacGillavry relate the deviation parameter (Si) of the ith fringe from the exact Bragg condition to the specimen thickness (t) with the equation:Where ξg, is the extinction distance for that reflection and ni is an integer.

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