Fig. 7. (Color online) ESPI images on the resonance pipe by using AR application. (a) shows the resonance pipe with no marker. (b) shows the case when an ESPI image of n = 4 is on the resonance pipe. (c) shows the case when an ESPI image of n = 5 is on the resonance pipe. (d) shows the case an ESPI image is displayed on the resonance tube when excited at a frequency other than the resonance frequency.
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