SC24
Electron microscopes have to operate in anambient magnetic field comprising the earth’s field and fields radiated byelectric power networks and electricalmachines. When the ambient field changes, the electron beam in the microscope is deflected, causing loss of resolutionand image distortion. The SC24 system stabilises the field by dynamicallycreating nearly equal and opposite field changes, so that the microscopeperformance is much improved.
The SC24 system comprises a magnetic fieldcontrol unit, one or two magnetic field sensors and three orthogonal axismulticore cables, that are installed in the room where the field is to becancelled. The SC24 can drive single loop and double loop room size cables. Italso works with Helmholtz cables that are attached to a frame around thecolumn. Three power amplifiers in thecontrol unit drive currents through thecables to create a field of the opposite sign to the change in ambientfield. The magnetic field sensormeasures the resulting field and real time negative feedback reduces theambient field by the loop gain of the system. The system is dynamic,automatically responding to field changes within 100 µs.
SC24 Features
- Makes the ambient magnetic field “OK” for the electron microscope
- Adapts to field changes within 100 µs
- Touch screen intelligent user interface with automatic setup and DC reset
- Simultaneous AC & DC field display with choice of Tesla or Gauss unit
- Mixes dual sensors to create virtual sensor “inside” the EM column
- Use AC sensors for cancelling 50/ 60 Hz AC line fields or:
- Use DC sensors for cancelling tram and train DC fields and 50/60Hz
- Built-in test field generator
- Ethernet and USB ports for remote operation and monitoring
SC24 Product Guides (pdf)
Brochure for the full SC24 system
Monitor software option for Windows PC
AC magnetic field sensor option
DC magnetic field sensor option
Column sensor mount option for AC sensor
Sensor mount option for SEM
Sensor mount option for TEM
Single loop room cable option for SEM
Double loop room cable option for TEM
Frame-mounted Helmholtz cable option for SEM
Rectangular frame option for SEM