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A high spatial resolution,high velocity resolution all-fiber laser Doppler vibrometry(LDV) based on heterodyne detection for vibration measurements is reported.A linewidth of 1-kHz single-mode continuous fiber laser,polarization-preserving fiber,and a telescope with 30-mm aperture are used in this LDV.With the inphase-quadrature circuit and the digital differentiating discriminator,a high velocity resolution of 96.9 nm/s and a high displacement resolution of 2.5 pm are obtained simultaneously with a glass attached to a piezoceramic transducer.These values correspond to the measurement uncertainties of vibration velocity and displacement within 4.14% and 4.6%,respectively.
A high spatial resolution, high velocity resolution all-fiber laser Doppler vibrometry (LDV) based on heterodyne detection for vibration measurements is reported. A linewidth of 1-kHz single-mode continuous fiber laser, polarization- preserving fiber, and a telescope with 30 -mm aperture are used in this LDV. The inphase-quadrature circuit and the digital differential discriminator, a high velocity resolution of 96.9 nm / s and a high displacement resolution of 2.5 pm are obtained with a glass attached to a piezoceramic transducer. These values correspond to the measurement uncertaintyties of vibration velocity and displacement within 4.14% and 4.6% respectively.