Calibration technique for rotating PCB coil magnetic field sensors

Abstract

A high-accuracy calibration of inductive coil sensors based on Printed Circuit Board (PCB), commonly used in rotating coil field measurements of particle accelerator magnets, is presented. The amplitude and phase of signals with and without main field suppression are compared in order to simultaneously determine both the PCB rotation radius and the transverse offset of its plane from rotation center. The accuracy of planar wire placement on the PCB boards is exploited to create loops highly precise in area which rotate at different radii. Such an area reproducibility and circuit geometry allow the suppression of the fundamental field, enabling the calibration, as well as improving signal resolution and mitigating vibration effects. Furthermore, the calibration can be performed dynamically, insitu during measurements. Calibration accuracy is validated experimentally by referencing the PCB positions with a Coordinate Measuring Machine (CMM).

A Rotating-Coil Scanner for the Precise Magnetic Characterization of Superconducting Accelerator Magnets at Ambient Temperature

“…This way, the gradient measurement is insensitive to a possible PCB offset from the rotation axis and relies instead on the well-defined distance between the coils on the board. This characteristic is similar to the dipole-compensation scheme described in [8], but has the advantage of doubling the signal amplitude.…”

“…Their strongest limitation is the measurement of the local and integral field gradients, with an accuracy of 0.1% [7]. Recent advancements, using the induction coils based on the printed circuit board (PCB) technology, promise to improve that value to be better than 0.02% [8]. In any case, using two separate acquisition systems for the magnet characterization substantially increases the necessary measurement time and resources.…”

Establishing and Situating Functional Features of a Machine Component Using Iso GPS Situation Features. Application to the Alignment of Magnets in a Particle Accelerator

“…The real magnet is installed on a magnetic bench using a magnetic coil field sensor as described typically in [26], and the situation of its set of magnetic situation features is determined with respect to the alignment measurement mean. Figure 16 details the example of the fiducialization of an ESS quadrupole with a laser tracker.…”

Mutual inductance model of double printed circuit board‐based coplanar rectangular spiral coils for eddy‐current testing

“…Joseph DiMarco et al used PCB to measure the rotating coil field of particle accelerator magnet. 20 Xin Wang et al solved the problem that traditional coil could not be fixed on highspeed rotating equipment in wireless power transmission application by adopting the advantages of low quality coefficient of PCB single-layer printed spiral coil. 21 Yoann Pascal et al proposed a simple and economical comprehensive analysis model for magnetic, electrostatic and loss mechanisms of the structure by embedding magnetic components in PCB.…”

“…PCB is widely used in various engineering fields. Joseph DiMarco et al used PCB to measure the rotating coil field of particle accelerator magnet 20 . Xin Wang et al solved the problem that traditional coil could not be fixed on high‐speed rotating equipment in wireless power transmission application by adopting the advantages of low quality coefficient of PCB single‐layer printed spiral coil 21 .…”