Uncertainty analysis of traceable measurements of pulsed magnetic fields used in magnetotherapy

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00177016%3A_____%2F24%3AN0000007" target="_blank" >RIV/00177016:_____/24:N0000007 - isvavai.cz</a>

Result on the web

<a href="https://zenodo.org/records/12513685" target="_blank" >https://zenodo.org/records/12513685</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.33542/EMSA-0340-1" target="_blank" >10.33542/EMSA-0340-1</a>

Result language

angličtina

Original language name

Uncertainty analysis of traceable measurements of pulsed magnetic fields used in magnetotherapy

Original language description

One of the practical applications of pulsed magnetic fields (PMF) is in magnetotherapy systems. These systems often generate low-frequency PMF for non-invasive therapy of muscles or bones. Some PMF system manufacturers use commercial teslameters with a Hall probe to measure the generated amplitude of the magnetic flux density Bm. However, the traceability and accuracy measurements of Bm of PMF using a Hall probe is an issue. There are papers describing methods using various types of search coils or pick-up coils with a digital oscilloscope or a DAQ device [1] for this kind of measurement, but they offer no stated traceability or detailed uncertainty analysis. Integration of the induced voltage pulse using an integrator is needed in order to calculate the measured value of Bm. A method using a special PCB search coil [2] with a digital oscilloscope has been developed at CMI. The method has been tested on pulse magnetic field signals (Fig. 1) with repeating frequencies of 40 Hz and 140 Hz (generated Bm value of about 2 mT and about 12 mT). This method can be used without using an integrator, and the Bm value is determined directly from the sampled pulse parameters. However, the expanded uncertainty value of the measurement is quite high (about 40 % in the worst case for a Bm value of about 2 mT using a DSO-X 4024A oscilloscope). A comparison was performed between the use of an 8-bit (DSO-X 4024A) and a 16-bit (PicoScope 5444D) digital oscilloscope. Further, the method was improved using a 3458A digital multimeter as a digitizer, which significantly reduced the expanded uncertainty of the measurement (about 3 % for a Bm value of about 2 mT). The measurement results obtained using the 3458A multimeter were compared to the results obtained using digital oscilloscopes and also with measurements obtained by various teslameters with Hall probes. A description will be presented of the method, the results and a detailed uncertainty analysis using digital oscilloscopes and a 3458A multimeter.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20201 - Electrical and electronic engineering

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

The XIV. European Magnetic Sensors and Actuators Conference - Book of Abstracts

ISBN

978-80-574-0340-1

ISSN

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e-ISSN

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Number of pages

1

Pages from-to

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Publisher name

ŠafárikPress Publishing, Pavol Jozef Šafárik University in Košice

Place of publication

Košice, Slovensko

Event location

Košice, Slovensko

Event date

Jan 1, 2024

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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