A method of controlling the instability in fluid film bearings by using a magnetic bearing in combination with a fluid film bearing, wherein the fluid film bearing serves as the primary load carrying bearing and the magnetic bearing controls the instability of the fluid film bearing. The systems can communicate directly, indirectly, andor wirelessly. The SEE executes one or more tests to create a characterization signature for the core. In addition, the shielding means is formed from an absorptive or reflective film placed in a region outside the prescribed optical path or through machining the region outside the prescribed optical path. The second connection plate is position such that at least a portion of the second diagonal slot aligns with a portion of the first diagonal slot.