A new experimental measurement apparatus for achieving high sensitive, accurate, stable and simple structure for static strain measurement based on force application is proposed. This method is based on the combination of a Fiber Bragg Gratings (FBG) and a fiber Fabry-Perot Interferometric (FFPI) filter with a photo detector. The FFPI is formed by the two different mode fibers. A multi-mode fiber with separated two sections of signal-mode optic fibers by fusing method is used. The method produced reflective mirrors mechanism by fusing uncoated bare fibers. This renders the optic light interfere in two reflective mirrors and FFPI could be a high accurate filter thereof. The experiment setup and method will provide a cheaper measurement apparatus with the characteristics of high resolution for potential automatic measuring force device and smart material applications.
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