Abstract
How to apply an array of fiber-bundles to the receiving optics of a dual-beam laser interferometer was investigated regarding the measurement of particle size. An aperture construction with fiber-bundles enabled us to apply the interferometer to particle-sizing in narrow spaces owing to the flexibility and the fineness of optical fibers. It was also possible to adjust the “measurable range” of the visibility curve to the desired range of particle size by selecting the appropriate fiber-bundle or bundles from the array. Signal visibility was calculated by ray-tracing and measurement errors caused by oscillating components in visibility curves are discussed. Measured results for glass beads are also presented in order to confirm the analyses. Close agreements between the calculated and measured results were obtained.
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