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Non-contact evaluation of the resonant frequency of a microstructure using ultrasonic wave

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Abstract

This paper presents a novel non-contact method for evaluating the resonant frequency of a microstructure. Firstly, the microstructure under test is excited by ultrasonic waves. This excitation method does not impose any undefined load on the specimen like the electrostatic excitation and also this is the first actual use of ultrasonic wave for exciting a microstructure in the literature. Secondly, the amplitudes of the microstructure are determined by image edge detection using a Mexican hat wavelet transform on the vibrating images of the microstructure. The vibrating images are captured by a CCD camera when the microstructure is vibrated by ultrasonic waves at a series of discrete high frequencies (>30 kHz). Upon processing the vibrating images, the amplitudes at various excitation frequencies are obtained and an amplitude-frequency spectrum is obtained from which the resonant frequency is subsequently evaluated. A micro silicon structure consisting of a perforated plate (192 × 192 μm) and two cantilever beams (76 × 43 μm) which is about 4 μm thickness is tested. Since laser interferometry is not required, thermal effects on a test object can be avoided. Hence, the setup is relatively simple. Results show that the proposed method is a simple and effective approach for evaluating the dynamic characteristics of microstructures.

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Authors and Affiliations

  1. Department of Applied Mechanics, Nanjing University of Science and Technology, 210094, Nanjing, China

    X. Kang

  2. Institute of Engineering Mechanics, Southeast University, 210096, Nanjing, China

    X. Y. He

  3. Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, 117576, Singapore, Singapore

    C. J. Tay & C. Quan

Authors
  1. X. Kang
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  2. X. Y. He
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  3. C. J. Tay
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  4. C. Quan
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Corresponding author

Correspondence to X. Kang.

Additional information

The project supported by the National Natural Science Foundation of China (10772086 and 10727201) and the National University of Singapore (R-265-000-140-112).

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Kang, X., He, X.Y., Tay, C.J. et al. Non-contact evaluation of the resonant frequency of a microstructure using ultrasonic wave. Acta Mech Sin 26, 317–323 (2010). https://doi.org/10.1007/s10409-009-0300-4

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  • DOI: https://doi.org/10.1007/s10409-009-0300-4

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