A modular and multi-functional single-sided NMR sensor

We present a new single-sided NMR sensor which is designed with three detection modes. By combining different modules, this sensor can achieve magnet mode for mobile measurement, large detection depth measurement and homogeneous field measurement. The magnets of mobile mode are about 8.6 kg, and its field gradient is about 3.25 T/m. The magnets of large detection depth mode can be obtained by combining the magnets of mobile mode with additional magnets. This mode creates a similar magnetic field as mobile mode, but larger intensity, field gradient and volume of useful region. The homogeneous field mode is accomplished by a magnet structure gain from a group of outer magnets combined with a bar magnet. We have demonstrated that this modular and multifunctional single-sided NMR sensor is highly sensitive and is capable to determine relaxation time and diffusion coefficients of different fluids. Such a design is especially suitable for experiments that need to measure many samples in different situations. (C) 2017 Elsevier Inc. All rights reserved.