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. 2015 Nov 5;5:16063. doi: 10.1038/srep16063

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(a) The output electric signal of one vibrating unit for vibration frequency history monitoring in an extend period of time. (b) The output electric signal of one vibrating unit for vibration amplitude history monitoring. (c–e) The detailed outputs corresponding to TR2, TR3, TR4 in (a). (f) Measured mapping figure of a vibrating unit with working frequency deviated from settled value in some specific historical period. (g) Measured mapping figure of a vibrating unit with working amplitude deviated from settled value in some specific historical period.