Abstract
The signal visibility characteristics of a dual beam laser anemometer operated in a backscatter mode have been investigated both experimentally and analytically. The analysis is based on Mie's electromagnetic scattering theory for spherical particles and is exact within the limitations of the scattering theory. It is shown that the signal visibility is a function of the ratio of the particle diameter to the fringe spacing in a certain, restricted case; but more generally it also depends on the Mie scattering size parameter, refractive index, the illuminating beam polarization, and the size, shape, and location of the light collecting aperture. The character of backscatter signal visibility differs significantly from the forward scatter case, and it is concluded that backscatter measurement of particle diameters using the visibility sizing technique may not always be possible. Restrictions on the forward scatter application of the visibility sizing method are also discussed.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 677-684 |
| Number of pages | 8 |
| Journal | Applied Optics |
| Volume | 16 |
| Issue number | 3 |
| State | Published - Mar 1977 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
Cite this
LASER ANEMOMETER SIGNALS : VISIBILITY CHARACTERISTICS AND APPLICATION TO PARTICLE SIZING. / Adrian, Ronald; Orloff, Kenneth L.
In: Applied Optics, Vol. 16, No. 3, 03.1977, p. 677-684.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - LASER ANEMOMETER SIGNALS
T2 - VISIBILITY CHARACTERISTICS AND APPLICATION TO PARTICLE SIZING.
AU - Adrian, Ronald
AU - Orloff, Kenneth L.
PY - 1977/3
Y1 - 1977/3
N2 - The signal visibility characteristics of a dual beam laser anemometer operated in a backscatter mode have been investigated both experimentally and analytically. The analysis is based on Mie's electromagnetic scattering theory for spherical particles and is exact within the limitations of the scattering theory. It is shown that the signal visibility is a function of the ratio of the particle diameter to the fringe spacing in a certain, restricted case; but more generally it also depends on the Mie scattering size parameter, refractive index, the illuminating beam polarization, and the size, shape, and location of the light collecting aperture. The character of backscatter signal visibility differs significantly from the forward scatter case, and it is concluded that backscatter measurement of particle diameters using the visibility sizing technique may not always be possible. Restrictions on the forward scatter application of the visibility sizing method are also discussed.
AB - The signal visibility characteristics of a dual beam laser anemometer operated in a backscatter mode have been investigated both experimentally and analytically. The analysis is based on Mie's electromagnetic scattering theory for spherical particles and is exact within the limitations of the scattering theory. It is shown that the signal visibility is a function of the ratio of the particle diameter to the fringe spacing in a certain, restricted case; but more generally it also depends on the Mie scattering size parameter, refractive index, the illuminating beam polarization, and the size, shape, and location of the light collecting aperture. The character of backscatter signal visibility differs significantly from the forward scatter case, and it is concluded that backscatter measurement of particle diameters using the visibility sizing technique may not always be possible. Restrictions on the forward scatter application of the visibility sizing method are also discussed.
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UR - http://www.scopus.com/inward/citedby.url?scp=0017465136&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0017465136
VL - 16
SP - 677
EP - 684
JO - Applied Optics
JF - Applied Optics
SN - 0003-6935
IS - 3
ER -