Abstract
A prototype near-backscatter reference beam laser Doppler velocimeter was developed for measuring the component of velocity along its line-of-sight. It was used in combination with a previously commissioned single colour rotatable differential Doppler velocimeter for the simultaneous measurement of axial and radial velocities near a model mounted in a large water tunnel. This paper describes the reasons for adopting the reference beam method and the design principles that were employed. Sensitive signal processors were used and alignment problems were solved by means of optical fibres. Line-of-sight velocities of up to 2 m/s were measured with the same precision as that in the transverse directions. Future detailed attention to the optical system would increase the signal light flux and, thereby, enable faster flows to be measured.
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