METHOD AND APPARATUS FOR RESONANT FREQUENCY IDENTIFICATION THROUGH OUT-OF-PLANE DISPLACEMENT DETECTION
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Abstract
A method for out-of-plane displacement detection is disclosed. The out-of-plane displacement is detected by analyzing all the fringe density indexes calculated using the frequency-domain information extracted from a series of interference images of the sample vibrating at different frequencies. The present invention further discloses a method and an apparatus for resonant frequency identification by detecting the peak value of all the fringe indexes calculated at different scanning frequencies. With the identified resonant frequency, the full-field vibratory surface profile of the sample in various resonance modes can be reconstructed.
18 Citations
23 Claims
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1-15. -15. (canceled)
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16. An apparatus for out-of-plane displacement detection and resonant frequency identification, comprising:
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a central control unit; a synchronous control unit, coupled to the central control unit for generating the first, second and third control signals synchronously with the control signal of the central control unit; a vibration-driving unit for carrying and vibrating the sample upon receiving the first control signal; a light-emitting unit for generating a stroboscopic flash upon receiving the second control signal; and an image acquisition unit for acquiring an interference image from the sample upon receiving the third control signal, and transmitting the interference image acquired to the central control unit. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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Specification