NIST has developed the Cold Atom Vacuum System (CAVS), a new quantum-based standard for measuring vacuum pressure. This device acts as a primary sensor that is intrinsically accurate, eliminating the need for the periodic recalibration required by conventional gauges. By using a trap containing approximately one million ultra-cold atoms, CAVS provides measurements compatible with the International System of Units (SI) without relying on external reference points.
The system determines pressure by monitoring the light emitted by these atoms. When gas molecules collide with the trapped atoms, the atoms are ejected, causing the light to dim; the rate of this dimming reveals the exact number of molecules in the vacuum. This high level of precision benefits industries like microelectronics, aerospace, and pharmaceuticals that rely on ultra-clean environments to manufacture sensitive components.
While the technology is currently functional for ultra-high vacuum levels, it remains in the research and development phase. Ongoing efforts focus on miniaturizing the equipment and improving components like 3D-printed dispensers to facilitate broader industrial use. Once further refined, CAVS aims to replace standard ionization gauges and set a new benchmark for vacuum metrology.
Source: https://www.nist.gov/noac/technology/thermodynamics/cold-atom-vacuum-system
Keywords: cold atom vacuum system, primary standard, fluorescence dimming
