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Lecture

SQUID: Measurement and Applications

In course

MSE-438: Superconducting electronics: A materials perspective

Introduction to superconducting electronic applications and their material requirements, including the fundamental phenomenology of superconductors. Key applications and their material requirements: a) magnets; b) quantum metrology; c) quantum computation. ...

Description

This lecture covers the principles of SQUID (Superconducting Quantum Interference Device) technology, including its use as an interferometer for sensing magnetic fields and its revolutionary impact on sensing and detection in various fields such as gravity measurements and mineral exploration projects. The instructor explains the operation of dc-SQUID and RF-SQUID, their sensitivity levels, and the computation of responses in Josephson junction networks.

Official source

Related concepts (32)

SQUID

A SQUID (superconducting quantum interference device) is a very sensitive magnetometer used to measure extremely weak magnetic fields, based on superconducting loops containing Josephson junctions. SQUIDs are sensitive enough to measure fields as low as 5×10−14 T with a few days of averaged measurements. Their noise levels are as low as 3 fT·Hz−. For comparison, a typical refrigerator magnet produces 0.01 tesla (10−2 T), and some processes in animals produce very small magnetic fields between 10−9 T and 10−6 T.

Magnetometer

A magnetometer is a device that measures magnetic field or magnetic dipole moment. Different types of magnetometers measure the direction, strength, or relative change of a magnetic field at a particular location. A compass is one such device, one that measures the direction of an ambient magnetic field, in this case, the Earth's magnetic field. Other magnetometers measure the magnetic dipole moment of a magnetic material such as a ferromagnet, for example by recording the effect of this magnetic dipole on the induced current in a coil.

Technological applications of superconductivity

Technological applications of superconductivity include: the production of sensitive magnetometers based on SQUIDs (superconducting quantum interference devices) fast digital circuits (including those based on Josephson junctions and rapid single flux quantum technology), powerful superconducting electromagnets used in maglev trains, magnetic resonance imaging (MRI) and nuclear magnetic resonance (NMR) machines, magnetic confinement fusion reactors (e.g.

Sin

In a religious context, 'sin' is a transgression against divine law or a law of God. Each culture has its own interpretation of what it means to commit a sin. While sins are generally considered actions, any thought, word, or act considered immoral, selfish, shameful, harmful, or alienating might be termed "sinful".

Christian views on sin

In Christianity, 'sin' is an immoral act considered to be a transgression of divine law. The doctrine of sin is central to the Christian faith, since its basic message is about redemption in Christ. Hamartiology, a branch of Christian theology which is the study of sin, describes sin as an act of offence against God by despising his persons and Christian biblical law, and by injuring others. Christian hamartiology is closely related to concepts of natural law, moral theology and Christian ethics.

Related lectures (30)

Extended Josephson Junctions: Modeling and Critical Current

Covers the magnetic thickness, short and long junctions, and critical current.

Josephson Junctions: Theory and Applications

Explores Josephson junctions, covering theory, fabrication, and practical applications in superconducting electronics.

Cosmological Puzzles: Dark Matter and Energy

Explores fundamental cosmological puzzles related to dark matter and energy.

Effects of inductance

Explores the impact of inductance in dc-SQUID systems, covering ring currents, self-flux, equations, screening parameters, and SQUID design considerations.

Maxwell's Equations

Covers Maxwell's equations, Fourier transform, and electromagnetic waves properties.

Related concepts (32)

SQUID

Magnetometer

Technological applications of superconductivity

Sin

Christian views on sin