Optical methods have many advantages over other measuring methods. They are non-invasive, quick to observe highly transient phenomena and have a high spatial and temporal resolution. Furthermore during measurement with most optical methods it is possible to visualize directly (on-line) the processes in the test section. The intention of this chapter is to serve as a guide as to selection of the best suitable technique for a given problem. Three tables, where the techniques discussed in this book are summarized for their capabilities and the approximate cost range for the required equipment, provide a base for the techniques selected. Since for most optical techniques the systems rely heavily on the light source, i.e. in most cases the laser, an additional table is provided giving an overview of the lasers currently available commercially as well as their main characteristic features.
KeywordsLaser Doppler Anemometry Holographic Interferometry Require Equipment High Power Pulse Laser Optical Measuring Technique
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