Patent ID: 7106057

Claim:
A method of measurement of high-frequency magnetic fields with a Superconducting Quantum Interference Device (SQUID), the method comprising the steps of: positioning a hysteretic SQUID over a predetermined location over a sample under study; activating at a predetermined time, the sample under study to generate a magnetic field emanating therefrom; and pulsed sampling said magnetic field by the steps of: (a) applying a pulsed bias current to said hysteretic SQUID after a predetermined time delay with respect to said predetermined time, said pulsed bias current comprising at least one pulse of a predetermined amplitude, (b) coupling a modulation flux to said hysteretic SQUID, and sweeping said modulation flux over a predetermined flux range sufficient to trigger said SQUID, thereby resulting in generation of at least one SQUID switching event at a respective modulation flux value, (c) recording said at least one SQUID switching event, and (d) repeating said steps (a)–(c) for a plurality of time delays; and interpolating said respective modulation flux values to obtain a corresponding value of said magnetic field emanating from the sample under study as a function of time.