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In many practical flow situations the complexity of the flow and the environmental conditions demand the use of non-invasive optical flow measurement techniques. Accurate, quantitative measurements are needed to obtain important flow details, vital data for design modifications, as well as validate and improve computational models. In many practical applications, qualitative visualization approaches provide general understanding of the flow in a large region of the flow. This paper will describe the use of qualitative and quantitative approaches to study flow problems. Flow measurements are carried out using laser based systems. For qualitative studies a laser light sheet probe is used. The probe head is very small allowing it to be placed in flow geometry's where access is limited. The system is also made flexible by the use of optical fibers so that the light sheet could be delivered at the desired location.