Active Magnetic Shielding for Sensitive Environments
Magnetic field cancellation systems use a closed-loop feedback approach to continuously sense and actively cancel ambient magnetic fields — including the Earth's field, powerline interference, and other environmental disturbances. The result is a precisely controlled, near-zero-field region ideal for sensitive electron microscopy, materials research, and precision measurement laboratories.
Sense
Fluxgate sensors continuously measure the residual magnetic field within the protected volume.
Process
A control unit computes the correction signal needed to cancel the measured field in real time.
Cancel
Compensation coils generate an opposing field that neutralizes ambient magnetic disturbances.
Result
A stable, near-zero-field environment maintained automatically without passive shielding.
Where Field Cancellation Is Used
Stefan Mayer Cancellation Systems
Stefan Mayer Instruments offers two active field cancellation systems — the MR-3 for full three-axis cancellation and the MK-1 for compact single-room installations — both leveraging the company's deep expertise in fluxgate sensor technology.
MR-3 — Three-Axis Active Field Cancellation System
MR-3Overview
The MR-3 is a fully active three-axis magnetic field cancellation system designed for laboratory and cleanroom environments where low residual magnetic fields are critical. It employs three pairs of orthogonal Helmholtz-style compensation coils driven by a precision control unit, continuously cancelling the Earth's field, AC powerline interference, and other ambient disturbances across all three spatial axes simultaneously.
The MR-3 is particularly well suited for electron microscopy suites, ion beam systems, and research laboratories where fluctuating magnetic fields degrade instrument performance or measurement accuracy. The system is scalable to different room sizes and can be configured for a wide range of protected volumes.
Key Specifications
- Full 3-axis (X, Y, Z) active compensation
- Cancels DC, low-frequency AC, and transient fields
- Fluxgate sensor feedback for each axis
- Helmholtz coil configuration
- Scalable to various room dimensions
- Suitable for SEM, TEM, FIB, and research labs
- Continuous closed-loop feedback control
- Contact us for attenuation specifications
MK-1 — Compact Active Field Cancellation System
MK-1Overview
The MK-1 is a compact and cost-effective active magnetic field cancellation system designed for smaller protected volumes, such as individual instrument enclosures, microscope stages, or single-instrument laboratory setups. It provides effective cancellation of DC and AC magnetic disturbances using an integrated sensor and control approach, making it straightforward to install and commission without specialist infrastructure.
The MK-1 is an excellent choice for facilities seeking to protect a single piece of sensitive equipment from magnetic interference without the complexity and cost of a full room-scale cancellation installation.
Key Specifications
- Active cancellation for compact volumes
- Cancels DC and AC magnetic disturbances
- Integrated sensor and control electronics
- Designed for single-instrument protection
- Straightforward installation and commissioning
- Cost-effective alternative to room-scale systems
- Contact us for attenuation specifications
Candoo Systems Inc. is an authorized reseller and installation service provider for Stefan Mayer Instruments magnetic field cancellation systems in Canada, the United States, and Mexico. Our engineering expertise ensures proper system design, installation, and commissioning for your specific facility. For pricing, availability, or a consultation on your requirements, please contact us.