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GONG Yuliang, LI Hongwei, BAI Shiwu, LIU Huimin. Principle,method and experiment of ultrasonic displacement measurement by Laser heterodyne interfrometer[J]. ACTA ACUSTICA, 1996, 21(3): 259-264. DOI: 10.15949/j.cnki.0371-0025.1996.03.011
Citation: GONG Yuliang, LI Hongwei, BAI Shiwu, LIU Huimin. Principle,method and experiment of ultrasonic displacement measurement by Laser heterodyne interfrometer[J]. ACTA ACUSTICA, 1996, 21(3): 259-264. DOI: 10.15949/j.cnki.0371-0025.1996.03.011
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Principle,method and experiment of ultrasonic displacement measurement by Laser heterodyne interfrometer

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  • This paper describes the measuring principle,method and experiment of ultrasonic displacement by Laser heterodyne interferometer.We use a Bragg diffraction cell as the frequency shifter,PPL as the PM demodulater.The effect of space collimation on the signal-to-noise ratio and decreasing the detection limit are discussed
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