Abstract

A laser system that simultaneously measures the falling velocity and size of large particles is constructed. In this system, a specially designed laser Doppler velocimeter (LDV) measures selectively the vertically falling velocity vector, and the size is measured using two beams intersecting at right angles in the center of the sampling volume of the LDV. The two values measured by the two beams are considered as the sizes projected to the illuminating directions of the beams. This system is applied to the measurement of rain droplets and snowflakes, and it gives clear relations between the falling velocity and the size.

© 1980 Optical Society of America

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References

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    [CrossRef] [PubMed]
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    [CrossRef] [PubMed]
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    [CrossRef]
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    [CrossRef]
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    [CrossRef] [PubMed]
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    [CrossRef]
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    [CrossRef] [PubMed]
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    [CrossRef]

1980 (1)

1978 (2)

G. Wigley, Rev. Sci. Instrum. 11, 639 (1978).
[CrossRef]

T. Abe, O. Sasaki, J. Jpn. Soc. Snow Ice 40, 166 (1978).
[CrossRef]

1977 (2)

1972 (1)

1968 (1)

E. C. Monahan, J. Geophys. Res. 73, 1127 (1968).
[CrossRef]

1958 (1)

Y. Toba, J. Oceanogr. Soc. Jpn. 14, 151 (1958).

1949 (1)

R. Gunn, G. D. Kinzer, J. Meteorol. 6, 243 (1949).
[CrossRef]

Abe, T.

Farmer, W. M.

Gunn, R.

R. Gunn, G. D. Kinzer, J. Meteorol. 6, 243 (1949).
[CrossRef]

Kinzer, G. D.

R. Gunn, G. D. Kinzer, J. Meteorol. 6, 243 (1949).
[CrossRef]

Monahan, E. C.

E. C. Monahan, J. Geophys. Res. 73, 1127 (1968).
[CrossRef]

Niwayama, M.

Roberds, D. W.

Sasaki, O.

Shimizu, T.

Toba, Y.

Y. Toba, J. Oceanogr. Soc. Jpn. 14, 151 (1958).

Wigley, G.

G. Wigley, Rev. Sci. Instrum. 11, 639 (1978).
[CrossRef]

Wu, Jin

Appl. Opt. (4)

J. Geophys. Res. (1)

E. C. Monahan, J. Geophys. Res. 73, 1127 (1968).
[CrossRef]

J. Jpn. Soc. Snow Ice (1)

T. Abe, O. Sasaki, J. Jpn. Soc. Snow Ice 40, 166 (1978).
[CrossRef]

J. Meteorol. (1)

R. Gunn, G. D. Kinzer, J. Meteorol. 6, 243 (1949).
[CrossRef]

J. Oceanogr. Soc. Jpn. (1)

Y. Toba, J. Oceanogr. Soc. Jpn. 14, 151 (1958).

Rev. Sci. Instrum. (1)

G. Wigley, Rev. Sci. Instrum. 11, 639 (1978).
[CrossRef]

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Figures (5)

Fig. 1
Fig. 1

Schematic construction of the system.

Fig. 2
Fig. 2

Falling velocity and size of rain droplets I.

Fig. 3
Fig. 3

Falling velocity and size of rain droplets II.

Fig. 4
Fig. 4

Falling velocity and size of snowflakes.

Fig. 5
Fig. 5

Falling velocity and size of rain droplets I when only one measured size is used.

Tables (1)

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Table I Measurement of Velocity and Size of Various Large Droplets

Equations (1)

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S = T × V ,

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