Spicer Consulting magnetic field cancelling systems are purpose-designed to reduce the magnetic field in the environment of electron microscopes and similar sensitive equipment. Thousands of our systems are in use worldwide, protecting instruments from all the major electron microscope manufacturers.
Today’s high performance electron beam tools are very sensitive to changing ambient magnetic fields. These fields are often referred to as electomagnetic interference or EMI. The fields move the beam causing loss of resolution and image distortion. Spicer Consulting cancelling systems reduce the ambient magnetic field and restore the resolution and image quality of the microscope. This process is sometimes called EMI cancellation.
All our cancelling systems comprise a Magnetic Field Control Unit, one or more Magnetic Field Sensors and three multicore cables, which are installed around the microscope for which the field is to be cancelled. Three power amplifiers in the control unit drive currents through the cables to create a field of the opposite sign to the change in ambient field. The magnetic field sensor measures the resulting field and real time negative feedback reduces the ambient field by the loop gain of the system.
All Spicer Consulting cancelling systems share the following features.
The following comparison highlights the differences between the available models