Fiber-grating sensor using dynamic PZT modulation

In this paper we propose a new sensor based on a periodically modulated fiber grating. The fiber grating is fixed on a PZT plate, which is modulated by an alternating voltage. In order to measure strains, we only use an oscilloscope and a single-mode-laser source to measure the change of the reflected-light pulse period. Comparing with the original method of strain measurement that using an optical spectrum analyzer and a broadband light source to measure the wavelength shift of reflected power peak, this method is much simpler and has lower cost. Our research results show that two methods are equivalent, and theoretical analysis well consists with experimental results.