Devices and systems for measuring magnetic fields
AssigneesInserm (Institut National De La Sante Et De La Recherche Medicale), Centre National De La Recherche Scientifique, Universite De Montpellier, Chu Montpellier, Ev-Technologies
InventorsQuang Hung Tran, Férial Terki, Trung Kien Nguyen, Gudrun Boge, Sidina Wane, Azzedine Bousseksou
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Abstract
The invention relates to a measurement device for measuring weak magnetic fields, such as fields in the sub-picotesla range (e.g. lower than a few nanotesla). The measurement device comprises ultrasensitive magnetic sensors (or arrays of ultrasensitive magnetic sensors) coupled to low-noise processing circuitry. The processing circuitry comprises a two-stage design including low-noise amplifiers and analog filters. The invention is suitable for magnetocardiovascular (MCV) applications thanks to its ability to measure very small magnetic fields with good accuracy and very little noise.
Claims19
A measurement device for measuring magnetic signals, comprising:
- only one magnetic sensor, and
- an electronic processing circuit connected to an output of the magnetic sensor,
- the electronic processing circuit comprising:
- a first amplifier and filter stage, connected in series with the output the magnetic sensor,
- a second amplifier and filter stage, connected in series with the first amplifier and filter stage, and
- an analog to digital converter connected to an output of the second amplifier and filter stage,
- the magnetic sensor being a high sensitivity magnetoresistance sensor having high thermal stability,
- the first amplifier and filter stage comprising a first low noise amplifier and at least a first linear analog filter configured to filter out parasitic magnetic fields and a first non-linear analog filter,
- the second amplifier and filter stage comprising a second low noise amplifier and a second linear analog filter and a second non-linear analog filter, the analog-to-digital converter being further connected to an output interface of the processing circuit.
Dependencies are inferred from the claim text.