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A Magnetic-Field Regulation and Stabilization System

  • ELECTRONICS AND RADIO ENGINEERING
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Abstract

An inexpensive system for controlling and stabilizing the magnetic-flux density of an electromagnet on the basis of a monolithic Hall sensor is described. The main functional unit of the system is a precision controllable stable-current source with digital control and a regulating unit based on a power MOSFET transistor, which operates in the saturation region. A signal from a magnetic-field sensor is used to control the magnetic-field flux density, while a negative electromagnet-current feedback stabilizes the flux density. In this method, the 1/f noise of a Hall-effect sensor does not affect stability of the electromagnet flux density, while the drift and noise characteristics of the system are determined by the parameters of the used reference-voltage source. The position of the working point of the transistor in the saturation region is stabilized in the entire range of operating currents using a drain–source voltage control circuit. The developed system is used to control the magnetic-field flux density of the mass analyzer of the MI1201IG mass spectrometer and provides the following characteristics of the magnetic-field flux density control: the operating frequency band is 0–10 Hz, the flux-density control range is 0–0.4 T with a step of 1.5 µT, and the overall drift and noise instability do not exceed ±2 × 10–6 T within 20 min in the operating temperature range of 20–50°С.

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Authors and Affiliations

  1. Northern Energetics Research Center, Branch of the Kola Science Centre, Federal Research Centre, Russian Academy of Sciences, 184209, Apatity, Murmansk oblast, Russia

    V. V. Kolobov & M. B. Barannik

Authors
  1. V. V. Kolobov
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  2. M. B. Barannik
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Corresponding authors

Correspondence to V. V. Kolobov or M. B. Barannik.

Additional information

Translated by A. Seferov

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Kolobov, V.V., Barannik, M.B. A Magnetic-Field Regulation and Stabilization System. Instrum Exp Tech 62, 646–652 (2019). https://doi.org/10.1134/S0020441219050075

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  • DOI: https://doi.org/10.1134/S0020441219050075

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