In this paper, we analyze theoretically the use of correlation statistical properties in the random speckle field, in the non-contact recording of free response information of vibrating object, and in terms of time domain signals collected simultaneously at the multiple points, and we conduct system identification techniques in the frequency and time domains to identify the dynamic parameters. The vibration of the bending arm of the dental drill is measured and analyzed. The lower-order natural frequencies and mode shapes are obtained.

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