Journal article
On the optimum spatial code of a laser anemometer
The question of the optimum spatial code of a light scattering laser anemometer is reexamined using the Fisher number as a figure of merit. We show that field distributions that are related by a Fourier transform yield the same Fisher number. The well known differential Doppler and time-of-flight configurations are therefore equally good.
Comparison with a diffraction limited upper bound on the Fisher number shows that these configurations are both suboptimal. We point out that the optimum code is likely to be Fourier self-reciprocal, and show that a self-reciprocal hybrid combination of the Doppler and time-of-flight configuration yields a spatial code that is superior to those used previously.
Language: | English |
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Year: | 1995 |
Pages: | 300-306 |
ISSN: | 18730310 and 00304018 |
Types: | Journal article |
DOI: | 10.1016/0030-4018(95)00114-N |
ORCIDs: | Jørgensen, T.M. |