Abstrat: The FIT sensor investigated in this study utilizes the Stewart Platform Mechanism Structure. Normally-employed 6-prismatic joints are replaced by 6-prismatic bars, which are extensible and compressible only along the axial direction of the bars. The complete analyses for the design of this kind of FIT sensor are conducted: the position analysis, the first-order and second-order kinematic analyses, and the force-deformation analysis based on the first-order kinematic characteristics of the system. Lastly, a dimensional synthesis for the FIT sensor is performed based on the kinematic isotropic index.