Abstract

We have developed a technique using light scattered from individual particles in the near-forward direction to measure particle size in the range of 10–200 μm. This technique uses the Mie scattering theory to relate the measured light intensity to particle size based on calibration techniques employing pinholes and water droplets of known size. We have applied a unique two-color optical arrangement to minimize the edge effect which can cause incorrect size measurements for particles that pass through the edge of the laser beam focal volume. In this paper we describe our experimental technique and the results of size measurements obtained with this technique for water droplets and pulverized coal particles.

© 1986 Optical Society of America

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References

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  1. D. J. Holve, D. A. Tichenor, J. C. F. Wang, D. R. Hardesty, “Design Criteria and Recent Developments of Optical Single Particle Counters for Fossil Fuel Systems,” Opt. Eng. 20, 529 (1981).
    [CrossRef]
  2. N. Chigier, G. Stewart, Eds. “Particle Sizing and Spray Analysis,” Opt. Eng. 23, 554 (1984).
  3. D. Holve, S. A. Self, “Optical Particle Sizing for in situ Measurements Part 1,” Appl. Opt. 18, 1632 (1979)
    [CrossRef] [PubMed]
  4. E. O. Hirleman, “Laser-Based Single Particle Counters for In Situ Particulate Diagnostics,” Opt. Eng. 19, 854 (1980).
    [CrossRef]
  5. J. V. Dave, “Subroutines for Computing the Parameters of the Electromagnetic Radiation Scattered By a Sphere,” IBM Report320–3237 (1968).
  6. J. D. Holve, “In Situ Optical Particle Sizing Technique,” J. Energy 4, 176 (1980).
    [CrossRef]
  7. D. A. Tichenor, R. E. Mitchell, K. R. Hencken, S. Niksa, “Simultaneous In Situ Measurement of the Size, Temperature and Velocity of Particles in a Combustion Environment,” presented at the Twentieth International Symposium on Combustion, U. Michigan, Ann Arbor, 12–17 Aug. (1984).

1984

N. Chigier, G. Stewart, Eds. “Particle Sizing and Spray Analysis,” Opt. Eng. 23, 554 (1984).

1981

D. J. Holve, D. A. Tichenor, J. C. F. Wang, D. R. Hardesty, “Design Criteria and Recent Developments of Optical Single Particle Counters for Fossil Fuel Systems,” Opt. Eng. 20, 529 (1981).
[CrossRef]

1980

E. O. Hirleman, “Laser-Based Single Particle Counters for In Situ Particulate Diagnostics,” Opt. Eng. 19, 854 (1980).
[CrossRef]

J. D. Holve, “In Situ Optical Particle Sizing Technique,” J. Energy 4, 176 (1980).
[CrossRef]

1979

Dave, J. V.

J. V. Dave, “Subroutines for Computing the Parameters of the Electromagnetic Radiation Scattered By a Sphere,” IBM Report320–3237 (1968).

Hardesty, D. R.

D. J. Holve, D. A. Tichenor, J. C. F. Wang, D. R. Hardesty, “Design Criteria and Recent Developments of Optical Single Particle Counters for Fossil Fuel Systems,” Opt. Eng. 20, 529 (1981).
[CrossRef]

Hencken, K. R.

D. A. Tichenor, R. E. Mitchell, K. R. Hencken, S. Niksa, “Simultaneous In Situ Measurement of the Size, Temperature and Velocity of Particles in a Combustion Environment,” presented at the Twentieth International Symposium on Combustion, U. Michigan, Ann Arbor, 12–17 Aug. (1984).

Hirleman, E. O.

E. O. Hirleman, “Laser-Based Single Particle Counters for In Situ Particulate Diagnostics,” Opt. Eng. 19, 854 (1980).
[CrossRef]

Holve, D.

Holve, D. J.

D. J. Holve, D. A. Tichenor, J. C. F. Wang, D. R. Hardesty, “Design Criteria and Recent Developments of Optical Single Particle Counters for Fossil Fuel Systems,” Opt. Eng. 20, 529 (1981).
[CrossRef]

Holve, J. D.

J. D. Holve, “In Situ Optical Particle Sizing Technique,” J. Energy 4, 176 (1980).
[CrossRef]

Mitchell, R. E.

D. A. Tichenor, R. E. Mitchell, K. R. Hencken, S. Niksa, “Simultaneous In Situ Measurement of the Size, Temperature and Velocity of Particles in a Combustion Environment,” presented at the Twentieth International Symposium on Combustion, U. Michigan, Ann Arbor, 12–17 Aug. (1984).

Niksa, S.

D. A. Tichenor, R. E. Mitchell, K. R. Hencken, S. Niksa, “Simultaneous In Situ Measurement of the Size, Temperature and Velocity of Particles in a Combustion Environment,” presented at the Twentieth International Symposium on Combustion, U. Michigan, Ann Arbor, 12–17 Aug. (1984).

Self, S. A.

Tichenor, D. A.

D. J. Holve, D. A. Tichenor, J. C. F. Wang, D. R. Hardesty, “Design Criteria and Recent Developments of Optical Single Particle Counters for Fossil Fuel Systems,” Opt. Eng. 20, 529 (1981).
[CrossRef]

D. A. Tichenor, R. E. Mitchell, K. R. Hencken, S. Niksa, “Simultaneous In Situ Measurement of the Size, Temperature and Velocity of Particles in a Combustion Environment,” presented at the Twentieth International Symposium on Combustion, U. Michigan, Ann Arbor, 12–17 Aug. (1984).

Wang, J. C. F.

D. J. Holve, D. A. Tichenor, J. C. F. Wang, D. R. Hardesty, “Design Criteria and Recent Developments of Optical Single Particle Counters for Fossil Fuel Systems,” Opt. Eng. 20, 529 (1981).
[CrossRef]

Appl. Opt.

J. Energy

J. D. Holve, “In Situ Optical Particle Sizing Technique,” J. Energy 4, 176 (1980).
[CrossRef]

Opt. Eng.

E. O. Hirleman, “Laser-Based Single Particle Counters for In Situ Particulate Diagnostics,” Opt. Eng. 19, 854 (1980).
[CrossRef]

D. J. Holve, D. A. Tichenor, J. C. F. Wang, D. R. Hardesty, “Design Criteria and Recent Developments of Optical Single Particle Counters for Fossil Fuel Systems,” Opt. Eng. 20, 529 (1981).
[CrossRef]

N. Chigier, G. Stewart, Eds. “Particle Sizing and Spray Analysis,” Opt. Eng. 23, 554 (1984).

Other

J. V. Dave, “Subroutines for Computing the Parameters of the Electromagnetic Radiation Scattered By a Sphere,” IBM Report320–3237 (1968).

D. A. Tichenor, R. E. Mitchell, K. R. Hencken, S. Niksa, “Simultaneous In Situ Measurement of the Size, Temperature and Velocity of Particles in a Combustion Environment,” presented at the Twentieth International Symposium on Combustion, U. Michigan, Ann Arbor, 12–17 Aug. (1984).

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Figures (9)

Fig. 1
Fig. 1

Schematic of the two-color particles sizing system.

Fig. 2
Fig. 2

Laser intensity distributions at the scattering volume of the two-color particle sizing arrangement.

Fig. 3
Fig. 3

Scattered light signals from the same particle in the scattering volume of the two-color particle sizing arrangement.

Fig. 4
Fig. 4

Sampling frequency correction factor normalized with respect to 60-μm particles.

Fig. 5
Fig. 5

Mie scattering response curve and pinhole calibration.

Fig. 6
Fig. 6

Size and velocity measurements of monodispersed water droplets from a Berglund-Liu generator.

Fig. 7
Fig. 7

Comparison tests on measurement accuracy for particles passing through the center and edge of the sampling volume.

Fig. 8
Fig. 8

In situ measurements of coal particle size and velocity distributions.

Fig. 9
Fig. 9

Size and velocity correlation of particles shown in Fig. 6.

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