A New Measurement Method for Resonance Frequency of Fiber Optic Interferometric Vibration Detector

This paper proposed a new resonance frequency measurement method for fiber optic interferometric vibration detector. The harmonic components’ number of the interference signal is only modulated by the modulation depth varying in theory, simulation and experiments demonstrate with piezoceramics. Sweeping the vibration frequency and maintaining the shaking amplitude of the vibration excitation, the resonance frequency can be measured while the number of harmonic components of interference signal dramatically increases and contains the maximum value. The experiment takes about 10 s for test, it verifies that the proposed approach is an efficient and practical method.