What is it about?
Modern possibilities of digital signal processing open the way to the creation of compact, inexpensive, and efficient measuring devices. There are three sources of errors in any measurement process: (I) erroneous data taken from the sensor at the moments when the measurement result has not yet settled, (II) random noise that accompanies any measurement, and (III) individual deviations of the sensor parameters from ideal, inherent in any analog device. Effective suppression of these errors in a measuring device with full digital control is achieved, respectively: (I) rejecting the data obtained under abnormal conditions (time domain filtering), (II) accumulating results for a sufficient time (frequency domain filtering), and (III) digital correcting the results taking into account the individual characteristics of the sensor based on the calibration once performed.
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Why is it important?
This approach was used to create a patented precision Hall effect magnetometer for use in a desktop Electron Paramagnetic Resonance spectrometer with a permanent magnet system and scanning coils. Magnetometer control and all digital processing were done using a Field-Programmable Gate Array IC. The magnetometer is small in size and cost and provides a high resolution of 0.1 μT and an absolute measurement error of not exceeding 6 μT.
Perspectives
Time-domain filtering of data before further processing for eliminating invalid data can improve the accuracy of any measurement in the presence of noise or transients that occur at a predictable time.
Mikhail Artyomov
Ural Federal University, Institute of Natural Sciences and Mathematics
Read the Original
This page is a summary of: Precision Hall Effect magnetometer, Review of Scientific Instruments, March 2023, American Institute of Physics,
DOI: 10.1063/5.0131896.
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