Design and construction of a single-axis, low-frequency magnetic probe (B-dot probe) calibrated with a LCvar Helmholtz resonant circuit

Authors

  • M. Lindero Hernandez Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada-Queretaro, Instituto Politecnico Nacional, Cerro Blanco 141, Colinas del Cimatario, 76090 Santiago de Queretaro, Qro.
  • A.G. Espino-Hernández Instituto Tecnologico Nacional, Av. Tecnologico s/n, Centro, 76000 Santiago de Queretaro, Qro.
  • and M. Romero-Bastida Secci´on de Estudios de Posgrado e Investigacion, Escuela Superior de Ingenieria Mecanica y Electrica-Culhuacan del Instituto Politecnico Nacional, Avenida Santa Ana 1000, Colonia San Francisco Culhuacan, Delegacion Coyoacan, Distrito Federal 04430, Mexico.

DOI:

https://doi.org/10.31349/RevMexFis.65.560

Keywords:

B-dot, Half bridge oscillator, LCvar resonant circuit.

Abstract

Magnetic probes (also known as B-dot coil) are electromagnetic devices used to measure magnetic
eld variations in many frequency ranges. The measured magnetic eld frequency directly relates to
the elected method to make the B-dot coil calibration. This work presents a B-dot coil calibration in
a frequency range from 6.16 kHz to 36.63 kHz. An inductor L (Helmholtz coil) connects in parallel
with a variable capacitor bank Cvar to form a coupled LCvar resonant circuit. The LCvar circuit is
fed with a half bridge oscillator. The capacitance Cvar is varied until the circuit is in resonant state
at dierent frequencies. The resonant circuit produces sinusoidal oscillations in the aforemention
frequency band. The sensitivity is calculated by using voltage Vout of the B-dot coil and voltage
VH measured from Helmholtz terminals.

Author Biography

M. Lindero Hernandez, Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada-Queretaro, Instituto Politecnico Nacional, Cerro Blanco 141, Colinas del Cimatario, 76090 Santiago de Queretaro, Qro.

MSc

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Published

2019-09-02

How to Cite

[1]
M. L. Hernandez, A. Espino-Hernández, and and M. Romero-Bastida, “Design and construction of a single-axis, low-frequency magnetic probe (B-dot probe) calibrated with a LCvar Helmholtz resonant circuit”, Rev. Mex. Fís., vol. 65, no. 5 Sept-Oct, pp. 560–565, Sep. 2019.

Issue

Vol. 65 No. 5 Sept-Oct (2019): Revista Mexicana de Física

Section

09 Instrumentation

License

Authors retain copyright and grant the Revista Mexicana de Física right of first publication with the work simultaneously licensed under a CC BY-NC-ND 4.0 that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.