ETSI - TR 103 517
System Reference document (SRdoc); Short Range Devices (SRD) using Nuclear Magnetic Resonance (NMR); Technical characteristics for SRD equipment using Nuclear Magnetic Resonance (NMR) technology in the frequency range 0,1 kHz to 130 MHz
|Publication Date:||1 December 2018|
The present document provides information on NMR systems operating in the frequency range below 130 MHz.
It deals only with NMR systems using earth magnetic field strength of rare earth magnets and electromagnets and not with superconducting magnets. This limits the maximum static magnetic field strength to less than 3 Tesla. As a direct result, the maximum proton nuclear magnetic resonance is limited to less than 130 MHz. The minimum nuclear resonances of nuclei in scope are below 1 kHz in earth magnetic field.
There are two types of NMR devices:
1) "enclosed NMR sensor": Material under Test is put inside the device;
2) "open NMR sensor": - material under Test is placed on the device;
- opened to one side for measurement of building materials like a GPR or WPR generating wanted field emission at the sensor boundaries;
- opened 360°, e.g. like a pole inside a Material under Test generating wanted field emission at the sensor boundaries;
- there is no enclosure around the sensor, called "open NMR sensor".
Only "enclosed NMR" sensors" are in the scope of the present document.
Nuclear Magnetic Resonance Imaging (MRI) and Magnetic Resonance Tomography (MRT) systems are out of scope.
It reviews the present regulations for NMR systems (if any), the related markets and the evolution of the technology and it identifies limits for NMR systems operating below 130 MHz.
The present document contains the necessary information to support the possible co-existence and compatibility studies to be conducted by the CEPT/ECC, including:
• market information;
• technical information;
• regulatory issues.