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Magnetic Resonance An interactive open-access publication of the Groupement AMPERE
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https://doi.org/10.5194/mr-2020-8
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/mr-2020-8
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 24 Apr 2020

Submitted as: research article | 24 Apr 2020

Review status
A revised version of this preprint is currently under review for the journal MR.

ArduiTaM: accurate and inexpensive NMR auto tune and match system

Mazin Jouda, Saraí M. Torres Delgado, Mehrdad Alinaghian Jouzdani, Dario Mager, and Jan G. Korvink Mazin Jouda et al.
  • Karlsruhe Institute of Technology (KIT), Institute of Microstructure Technology, Karlsruhe 76131, Germany

Abstract. We introduce a low complexity, low cost, yet sufficiently accurate automatic tune and match system for NMR and MRI applications. The ArduiTaM builds upon an Arduino Uno embedded system that drives a commercial frequency synthesizer chip to perform a frequency sweep around the Larmor frequency. The generated low power signal is fed to the NMR coil, after which the reflected waves are detected using a directional coupler, and amplified. The signal shape is then extracted by means of an envelope detector and passed on to the Arduino, which performs a dip search while continuously generating actuator control patterns to adjust the tune and match capacitors. The process stops once the signal dip reaches the Larmor frequency. The ArduiTaM works readily with any spectrometer frequency in the range from 1 T to 23 T. The speed of ArduiTaM is mainly limited by the clock of the Arduino, and the capacitor actuation mechanism. The Arduino can easily be replaced by a higher speed micro controller, and varactors can replace stepper-motor controlled variable capacitors. The ArduiTaM is made available in open source, so it is easily duplicated.

Mazin Jouda et al.

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Mazin Jouda et al.

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Latest update: 04 Jun 2020
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Short summary
We have assembled a few off-the-shelf electronic chips and a popular Arduino Uno microcomputer board into an automatic system that performs so-called tuning and matching of an arbitrary NMR probehead at very low cost. This removes the tedium of doing the job by hand, the bane of many NMR analysts. It also brings accuracy and repeatability into the process, which is so necessary for high throughput analysis, or when working with low-field permanent magnesystems with excessive magnetic field drift.
We have assembled a few off-the-shelf electronic chips and a popular Arduino Uno microcomputer...
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