Provided are a method and a system to distribute clock signals in digital circuits to ensure that the multiple clock signals reach multiple loads associated with the digital circuit, concurrently. In accordance with one aspect, variation in the available transmit power over time is estimated. The fractional surface contacts may be associated with the emitter, a barrier, or the collector. The array of sensors can remotely provide data corresponding to at least one of a degree of cure of the protective coating, a health of the cured protective coating, and a corrosion rate of the engineered structure at each of the sensors.