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1 December 2008 One-wavelength two-component laser Doppler velocimeter system for surface displacement monitoring
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A two-component laser Doppler velocimeter (2D-LDV) prototype for surface-displacement measurement is presented. The system proposed is based on the Doppler differential technique with a backwardscattering configuration. A reference and two frequency-shifted probe beams are generated departing from a single laser beam by means of two beamsplitters and acousto-optic modulators. This configuration has the advantage of using a single-wavelength laser source and a single detector system, while permitting sign detection of the two vector components of the velocity in surface-displacement measurements. It also enables the implementation of a low-cost multitrigger data acquisition system, which is useful in low signal-to-noise ratio (SNR) situations, such as the velocity measurement of low-dispersion surfaces or in hydrodynamic applications. The prototype has been designed to measure velocities up to 3 m per second, both in industrial (solid target) and hydrodynamic applications, with an error well below 1% in the tests performed. The system works in real time with the use of an acquisition card and C++ based software on a PC.
©(2008) Society of Photo-Optical Instrumentation Engineers (SPIE)
David García-Vizcaíno, Federico Dios, Jaume Recolons, Alejandro Rodriguez, and Adolfo Comeron "One-wavelength two-component laser Doppler velocimeter system for surface displacement monitoring," Optical Engineering 47(12), 123606 (1 December 2008).
Published: 1 December 2008


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