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With the widespread use of metal detectors for security purposes in courthouses, penal institutions, and airports, a risk may exist for users of personal medical electronic devices (PMEDs) because of electromagnetic interference (EMI) from the magnetic fields generated by the metal detectors.
An emulator that simulates the linearly-polarized magnetic fields of walk-through metal detectors was developed by NIST researchers for the FDA to conduct EMI tests of PMEDs. The emulator consists of a current source and specially designed coil that can simulate magnetic fields with adequate uniformity and with the rapid time varying characteristics found in some walkthrough metal detectors, as well as numerous handheld metal detectors.
Because the emulator can be readily fabricated, manufacturers of PMEDs have the option of building their own emulators for conducting EMI tests of their products.