| Summary: | 碩士 === 國立彰化師範大學 === 工業科技教育學系 === 82 === In this thesis, first the basic principles of 90-degree knife-edge beam profliometry is described in details. It is pointed out that this type of system is universal to measure light intensity distribution of an arbitrary profile and spot size of a light spot. Then the experimental design and setup are stated. The computer programs used in this research for data analysis including curve fitting and regression calculation are also explained and attached.
Applying this beam profiling system to three different light sources, it is found that there is a trade-off between measurement accuracy (stage moving resolution) and the tolerance of unstability when an unstable light source is measured. However, in measuring a stable light source, a good agreement on spot diameter is found between measured data and curve prediction from curve-fitting. Moreover, these measured data are close to those measured by a 10um pin hole.
Thus, our beam profilometry system is proved to be useful in measuring a Gaussian light distribution.
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