|Location||Houston Geoscience Center|
The EVS's vital assembly consists of a coil suspended in the gap of a high flux permanent magnet assembly. It offers extremely rigid motion direction, and gives clean responses at high frequencies. Each EVS basic unit is equipped with an additional stabilizing "spider" A stabilizing rod, affixed firmly to the coil and spring assembly on one end, extends through the center of the magnet and "free floats" in the spider at the opposite end of the magnet assembly. Spring resonance, associated with unbalanced spring assemblies, and metastability, often characteristic of two spring systems, is not possible in the EVS-2. Both the main spring and the spider are etched from flat stock and properly heat treated to effect maximum fatigue resistance.