Concentration determination using single-peak NMR spectra

A system for production line nuclear magnetic resonance (NMR) measurement of a fluid comprising a material having a single resonance frequency, the system comprising:

• a permanent magnet configured to generate a magnetic field;
• an NMR measurement unit coil positioned within the magnetic field;
• a reference sample housing configured to hold a reference sample comprising the material at a known concentration;
• a fluid conduit configured to hold a sample of the fluid;
• at least one radio frequency coil;
• and
• a processor configured to:
• control the at least one radio frequency coil to perform an NMR measurement,
• process detection signals to provide an NMR spectrum comprising a first peak associated with the material within the reference sample and a second peak associated with the material within the fluid, and
• determine a concentration of the material within the fluid based on a relationship between an attribute of the first peak, an attribute of the second peak and the known concentration.

A non-transitory computer-readable medium storing instructions that, when executed by a processor, cause the processor to perform a method for production line nuclear magnetic resonance (NMR) measurement of a fluid comprising a material having a single resonance frequency, the method comprising:

• positioning a reference sample comprising the material and a sample of the fluid within a sensing region of an NMR measurement unit coil of a production line NMR measurement device, and within a magnetic field of a permanent magnet of the production line NMR measurement device, wherein a concentration of the material within the reference sample is of a known value;
• performing an NMR measurement comprising feeding at least one radio frequency coil of the production line NMR measurement device with a signal having a spectrum that comprises a characteristic frequency of a nucleus of the material, and generating detection signals indicative of sensed radio frequency emissions associated with the reference sample and the sample of the fluid;
• processing the detection signals to provide an NMR spectrum comprising a first peak associated with the material within the reference sample and a second peak associated with the material within the fluid;
• and
• determining a concentration of the material within the fluid based on a relationship between an attribute of the first peak, an attribute of the second peak and the known value.