Dual-probe homodyne quadrature laser interferometer.
We present a dual-probe homodyne quadrature laser interferometer for the measurements of displacement at two separate spatial locations. This is a coupled homodyne interferometer with inverted polarity of probe signals featuring a wide dynamic range and constant sensitivity. As an application of this dual-probe interferometer, we demonstrate how to locate the pulsed-laser interaction site on a plate without knowing the propagation velocities of the laser-induced mechanical waves.
Faculty of Mechanical Engineering, University of Ljubljana, Ljubljana, Slovenia. tomaz.pozar@fs.uni-lj.si
Tomaž
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Požar
Janez
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Možina