Embodiments of the invention are directed to systems and methods for detecting sequential write threads in non-volatile storage media. The resonant frequency of the control system is a function of a bias current. Upon detonation, the reactive materials of the shaped charge liner undergo an exothermic reaction that raises the temperature and the effectiveness of the liner. A pocket implant is formed within the structure. When the assumptions have been updated a specified number of times or when a desired accuracy threshold has been met, the adjusted assumptions may be used to determine one or more sensor characteristics, such as the separation between the proximity sensor and the target object.