Electron Paramagnetic Resonance (EPR), also called Electron Spin Resonance (ESR) is a magnetic resonance technique which detects the resonance transitions between energy states of unpaired electrons in an applied magnetic field.

The EPR system is generally composed of a magnet system, a microwave system and an electronic detection system. The magnet system is generally divided into electromagnets, permanent magnets and superconducting magnets according to the principle that the main magnetic field generates the magnetic field. Currently, permanent magnets and electromagnets are commonly used.

Permanent magnets can permanently maintain magnetism, their construction and maintenance costs are relatively low, and they can be designed to be open and large in diameter, which is a boon for patients with claustrophobia.

The 0.041T super large opening EPR magnet produced by CSJ is a permanent magnet. Permanent magnets are used to generate a stable static magnetic field, the sweep coil is energized to generate a bias magnetic field, and the modulation coil is energized to generate a modulated magnetic field. It works with other components to generate an electronic paramagnetic resonance signal, thereby composing the test sample. Analysis of, status, etc.