NIST's atom-based magnetic sensor, about the size of a sugar cube, can measure human brain activity. Inside the sensor head is a container of 100 billion rubidium atoms (not seen), packaged with micro-optics (a prism and a lens are visible in the center cutout). The light from a low-power infrared laser interacts with the atoms and is transmitted through the grey fiber-optic cable to register the magnetic field strength.
A compass made of light promises to be more sensitive than anything in a boy scout’s wildest dreams. A light beam shot through a blob of rubidium atoms can directly and reliably measure the size and orientation of a magnetic field, ... Read Post
A miniature atom-based magnetic sensor has passed an important research milestone by successfully measuring human brain activity. The lightweight sensor potentially could be used for biomedical applications such as studying mental p... Read Post
In future a new magnetic sensor the size of a sugar cube might simplify the measurement of brain activity. In the magnetically shielded room of Physikalisch-Technische Bundesanstalt the sensor has passed an important technical test:... Read Post