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- W2038013337 abstract "Abstract A digital filtering procedure is presented for enhancing the detectability of multiple-pulse laser-generated narrowband ultrasound. Regarding their spectral characteristics, multiple-pulse laser-generated acoustic signals offer several advantages as compared with conventional single-pulse laser-generated ultrasound. In particular, multiple-pulse signals exhibit considerably narrower spectral content and offer the possibility for tuning the ultrasonic frequency, and yet still retain the high degree of temporal resolution possible with a single-pulse signal. For applications in non-destructive evaluation, adapting the frequency response of an interferometer to match the comb-like spectral signature of the multiple-pulse ultrasound would facilitate remote ultrasonic inspection with enhanced sensitivity. Towards this goal, the steps are outlined for applying a digital Wiener filtering method to multiple-pulse ultrasonic signals generated with a long cavity length mode-locked Nd: YAG laser and detected with a path-stabilized Michelson interferometer. Experimental results are presented for multiple-pulse waveforms generated at a pulse repetition frequency of 5 MHz, which demonstrate that Wiener filtering yields a significant improvement in the signal-to-noise ratio that is not possible with single-pulse laser ultrasonic methods." @default.
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- W2038013337 date "1994-05-01" @default.
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- W2038013337 title "Wiener filtering of laser-generated multiple-pulse narrow-band ultrasound for enhanced detectability by a laser interferometer" @default.
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- W2038013337 doi "https://doi.org/10.1016/0041-624x(94)90032-9" @default.
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