Frequency and Amplitude Measurement of a Vibrating Object in Water Using Ultrasonic Speckle Technique

Authors: Hongmao Zhu, Jun Chu, Lei Shen, Zhihua Luo

Abstract:

The principle of frequency and amplitude measurement of a vibrating object in water using ultrasonic speckle technique is presented in this paper. Compared with other traditional techniques, the ultrasonic speckle technique can be applied to vibration measurement of a nonmetal object with rough surface in water in a noncontact way. The relationship between speckle movement and object movement was analyzed. Based on this study, an ultrasonic speckle measurement system was set up. With this system the frequency and amplitude of an underwater vibrating cantilever beam was detected. The result shows that the experimental data is in good agreement with the calibrating data.

Keywords: Frequency, Amplitude, Vibration measurement, Ultrasonic speckle

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1058461

References:

[1] Y.H. Huang, L. Liu, F.C. Sham, Y.S. Chan, S.P. Ng. "Optical strain gauge vs. traditional strain gauges for concrete elasticity modulus determination”. International Journal for Light and Electron Optics, vol.121, no. 18, pp.1635 -1641, Oct. 2010.
[2] K. Saijyou and T. Okuyama. "Estimation of frequency characteristics of the Tonpilz piezoelectric transducer with a bending piezoelectric disk”. Applied Acoustics, vol.72, no.12, pp. 915-922, Dec. 2011.
[3] K. Kesavan, K. Ravisankar, S. Parivallal. "A technique for embedding EFPI fiber optic strain sensors in concrete”. Experimental Techniques, vol.28, no.4, pp.31-33, Jul. 2004.
[4] J. Yuan, Z. Qiu, S. Wang and J. Shao. "Research on wide range measurement system of free-form surfaces using laser displacement detector and grating displacement sensor”. Pro. of 9th Inter. Conf. on Electr. Measure. and Instr., vol.2, pp.1011-1014, Aug. 2009.
[5] A. Devillez and D. Dudzinski. "Tool vibrarion detection with eddy current sensors in machining process and computation of stability lobes using fuzzy classifiers”. Mechanical Systems and Signal Processing, vol. 21, no.1, pp.441-456, Jan. 2007.
[6] J.G. Abbott and F.L. Thurstone. "Acoustic speckle: theory and experimental analysis”. Ultrasonic imaging, vol.1, no.4, pp.303-324, Oct. 1979.
[7] H.M. Zhu and Q.H. Qin. "Statistics of ultrasonic speckles reflected from a rough surface”. Arch. Appl. Mech., vol.72, no.2-3. pp.189-198, Apr. 2002.
[8] H.M. Zhu, Y.Y. Wu and Y.G. Wang. "Average longitudinal size of ultrasonic speckles back scattered from an interface”. Arch. Appl. Mech., vol.73, no.11-12, pp.841-845, Jan. 2004.
[9] X.P. Wu, S.P. He and Z.C. Li. "Movement of the speckle in the space”. Acta. Phy. Sin.,vol. 29, no. 9, pp.1142-1150, Sep. 1980.
[10] W.H. Peters. "Applications of digital correlation methods to digital body mechanics”. Opt. Eng., vol. 22 , no.6, pp.738-742, Dec. 1983.