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. Author manuscript; available in PMC: 2020 Dec 1.
Published in final edited form as: IEEE Sens J. 2019 Aug 15;19(23):11242–11246. doi: 10.1109/jsen.2019.2935689

Fig. 5.

Fig. 5.

(a) Spectra shift in response to external pressure changes. (b) FFT results of the sensor spectra. When external pressure increased, the cavity length decreased.