This chapter presents the conceptualization and development of a novel sensor system designed to measure the absolute vibration displacement of mobile platforms, based on the quasi-zero stiffness (QZS) principle. The system employs a combination of positive and negative stiffness springs to achieve an effective QZS configuration, thereby establishing a broadband stationary point essential for accurate displacement measurement. A theoretical framework is developed to analyze the influence of structural parameters on measurement performance, guiding the system’s design. To address the instability commonly associated with negative stiffness in existing QZS systems, a prototype has been constructed with enhanced stability. Complementing the hardware, custom data-processing software has been implemented to perform time-domain measurements. The system’s effectiveness is validated through both simulation and experimental results, demonstrating its potential as a robust solution for precise vibration displacement sensing in dynamic environments.