SQUIDtækni

SQUIDtækni refers to Superconducting Quantum Interference Device technology. These are extremely sensitive magnetometers used to measure minute magnetic fields. SQUID devices are based on the principles of superconductivity and quantum mechanics, specifically the Josephson effect. A SQUID consists of a superconducting loop interrupted by one or two Josephson junctions. When a magnetic field passes through the loop, it causes a change in the superconducting current flowing through the device. This change in current can be detected and amplified, allowing for the measurement of incredibly small magnetic flux changes. There are two main types of SQUIDs: radio-frequency (RF) SQUIDs and DC SQUIDs. DC SQUIDs are generally more sensitive and are widely used. SQUIDtækni has applications in various fields. In medicine, it is used for magnetoencephalography (MEG) to study brain activity and magnetocardiography (MCG) for heart activity. In geophysics, SQUIDs can detect subtle magnetic anomalies in the Earth's crust for mineral exploration. They are also employed in fundamental physics research, materials science, and non-destructive testing. The extremely low noise levels and high sensitivity of SQUIDtækni make it an indispensable tool for precise magnetic field measurements.