Ultra-low frequency magnetic field probe for field measurements in gradient coils during medical device testing

• Published in: Electronics letters 2019-05, Vol.55 (11), p.634-636
• Main Authors: Attaran, A, Wawrzyn, C.M, Handler, W.B, Chronik, B.A
• Format: Article
• Language: English
• Subjects: 3D printed waterproofed cover; Biomedical technology; biomedical transducers; coils; dB‐dt exposure system; FR4; frequency 30 kHz; gain 40.0 dB; gradient coils; inductance measurement; induction loop antenna; inductive sensors; instrumentation amplifiers; instrumentational amplifier; loop antennas; magnetic field measurement; magnetic sensors; medical device testing; printed circuits; saline phantom; single‐sided PCB; size 1.57 mm; size 2 cm; size 35.0 mum; three‐dimensional printing; time‐varying magnetic field measurements; ultralow frequency magnetic field probe
• ISSN: 0013-5194; 1350-911X; 1350-911X
• DOI: 10.1049/el.2019.0204

In this Letter ultra-low frequency probes for measuring time-varying magnetic field produced in gradient coils were designed, fabricated, and tested. A 1 cm radius induction loop antenna followed by an instrumentational amplifier with a gain of 40 dB and a cutoff frequency of 30 KHz was designed to measure the magnetic field. The probe was fabricated on a single-sided PCB, FR4 of thickness 1.57 mm and copper of thickness 35 μm was employed in a dB/dt exposure system within a saline phantom using 3D printed waterproofed cover. Simulation and measurement results of the magnetic field were in good agreements.