| Summary: | 碩士 === 國立成功大學 === 航空太空工程學系 === 84 === Characterizing small particles is an important subject in many
engineering fields, especially in combustion fuel spray
smoke formation researchs .The most common measurement is
particle-sizing. Although various optical techniques for
particle sizing , such as laser scattering, LDA gating and
Fraunhofer diffraction technique , have developed ,no single
technique has been found capable of sa- tisfactory measurement
which occures in practical application.They a usually time-
consuming and need to propose many assumptions about the
particles itself.Morever,it seems to be difficult to realize
real-time diagnostics by using these techniques Therefore ,
there is still intense interest in searching for more
reliable and effective techniq- ues with acceptable quality.
Due to introduced of the new filter (Size-vari able computer
generated filter) , the convenient 4F Fourier optical system
having single configura- tion easier operation ability can
be used.The measuring results by using this new matched filter
were compared with the data obtained by using previous
filter.The Size-variable computer generat ed filter combined
with 4F system was shown to have better discrimination and
measurement accura- cy.
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