DIFFUSION BLOCK FOR AN EVACUATED INSTRUMENT SYSTEM

Instrument system (400), such as a gyroscope, includes instrument components (408) at least partially disposed in an evacuated chamber (410) within an instrument housing (406). The system also includes a barrier (412) that is configured to seal the evacuated chamber (410). The barrier (412) includes a plurality of instrument electrodes (414) that are electrically coupled to the instrument components (408) and extending through the barrier (412). The system further includes a diffusion block (416) formed of a non-diffusive material and coupled to the instrument housing (406) to seal an evacuated cavity (418) within the instrument housing (406) between the barrier (412) and the diffusion block (416).