This paper presents a measurement method of elastic vibration modes with extremely small vibration amplitudes in the very high frequency (VHF) range. The measurement system is an optical fiber interferometric sensor, which detects optical phase modulations caused by elastic vibrations being tested to give the vibration amplitudes. Extensive use of recent optical fiber technology and a signal processing technique enabled us to achieve detailed measurements of vibration amplitudes as small as 0.1 at frequencies as high as nearly 150 MHz.
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