Abstract

The design and performance of a real-time particle size measuring device for dense particulate systems are reported. Based on measuring the ratio of scattered light at two angles, this device, in contrast to particle sizing instruments previously reported, allows more than one particle in the focal volume at any time and selects the scattered light pulses for processing. Size distributions have been determined with an average number of particles in the focal volume of up to 2.5. This represents a potential increase of more than an order of magnitude in particle concentration over single particle sizing devices.

© 1978 Optical Society of America

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References

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  1. J. R. Hodkinson, Appl. Opt. 5, 830 (1966).
    [CrossRef]
  2. C. C. Gravatt, J. Air Pollut. Control Assoc. 23, 1035 (1973).
    [CrossRef] [PubMed]
  3. G. Kreikebaum, F. M. Shofner, “Design Considerations and Field Performance for an in situ, Continuous Fine Particulate Monitor Based on Ratio-Type Light Scattering,” presented at the International Conference of Environmental Sensing and Assessment, Las Vegas (1975) (unpublished).
  4. E. D. Hirleman, S. L. K. Witting, “In situ Optical Measurement of Automobile Exhaust Gas Particulate Size Distributions: Regular Fuel and Menthol Mixtures,” presented at the Symposium on Combustion, Boston (1976) (unpublished).
  5. C. Y. She, P. W. Chan, Appl. Opt. 14, 1767 (1975).
    [CrossRef] [PubMed]
  6. C. W. Ho, “A Real Time Measuring Device for Dense Particulate Systems,” M. S. Thesis, Colorado State University (1976) (unpublished).

1975

1973

C. C. Gravatt, J. Air Pollut. Control Assoc. 23, 1035 (1973).
[CrossRef] [PubMed]

1966

J. R. Hodkinson, Appl. Opt. 5, 830 (1966).
[CrossRef]

Chan, P. W.

Gravatt, C. C.

C. C. Gravatt, J. Air Pollut. Control Assoc. 23, 1035 (1973).
[CrossRef] [PubMed]

Hirleman, E. D.

E. D. Hirleman, S. L. K. Witting, “In situ Optical Measurement of Automobile Exhaust Gas Particulate Size Distributions: Regular Fuel and Menthol Mixtures,” presented at the Symposium on Combustion, Boston (1976) (unpublished).

Ho, C. W.

C. W. Ho, “A Real Time Measuring Device for Dense Particulate Systems,” M. S. Thesis, Colorado State University (1976) (unpublished).

Hodkinson, J. R.

J. R. Hodkinson, Appl. Opt. 5, 830 (1966).
[CrossRef]

Kreikebaum, G.

G. Kreikebaum, F. M. Shofner, “Design Considerations and Field Performance for an in situ, Continuous Fine Particulate Monitor Based on Ratio-Type Light Scattering,” presented at the International Conference of Environmental Sensing and Assessment, Las Vegas (1975) (unpublished).

She, C. Y.

Shofner, F. M.

G. Kreikebaum, F. M. Shofner, “Design Considerations and Field Performance for an in situ, Continuous Fine Particulate Monitor Based on Ratio-Type Light Scattering,” presented at the International Conference of Environmental Sensing and Assessment, Las Vegas (1975) (unpublished).

Witting, S. L. K.

E. D. Hirleman, S. L. K. Witting, “In situ Optical Measurement of Automobile Exhaust Gas Particulate Size Distributions: Regular Fuel and Menthol Mixtures,” presented at the Symposium on Combustion, Boston (1976) (unpublished).

Appl. Opt.

J. Air Pollut. Control Assoc.

C. C. Gravatt, J. Air Pollut. Control Assoc. 23, 1035 (1973).
[CrossRef] [PubMed]

Other

G. Kreikebaum, F. M. Shofner, “Design Considerations and Field Performance for an in situ, Continuous Fine Particulate Monitor Based on Ratio-Type Light Scattering,” presented at the International Conference of Environmental Sensing and Assessment, Las Vegas (1975) (unpublished).

E. D. Hirleman, S. L. K. Witting, “In situ Optical Measurement of Automobile Exhaust Gas Particulate Size Distributions: Regular Fuel and Menthol Mixtures,” presented at the Symposium on Combustion, Boston (1976) (unpublished).

C. W. Ho, “A Real Time Measuring Device for Dense Particulate Systems,” M. S. Thesis, Colorado State University (1976) (unpublished).

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Figures (5)

Fig. 1
Fig. 1

Photomultiplier output for different concentrations: (a) low concentrations; (b) higher concentrations.

Fig. 2
Fig. 2

The optical module.

Fig. 3
Fig. 3

Block diagram of the processing circuit.

Fig. 4
Fig. 4

Typical distribution for DOP smoke of high concentration ( N ¯ = 1.65 ).

Fig. 5
Fig. 5

Distribution for methylene blue particles with a diameter of 2.12 μm.

Tables (2)

Tables Icon

Table I Poisson Probability Distribution P ( n ) = exp ( N ¯ ) N ¯ n / n !

Tables Icon

Table II Comparison of the Theoretical and Experimental Count Rates

Metrics