Abstract
An electronic gradiometer was built using a HTS SQUID magnetometer array. A SQUID magnetometer in the center of the array was used to pick up background noise, and the output signal fed back to other magnetometers to cancel background noise. Fast feedback electronics were built for the background channel with a slew rate about 10/sup 7/ /spl Phi//sub 0//sec and 10 MHz small signal bandwidth. Two other magnetometers of the array were connected to pcSQUID/sup TM/ electronics with 5/spl times/10/sup 4/ /spl Phi//sub 0//sec slew rate using the AC bias mode to decrease 1/f noise. The output signals from these two magnetometers were input to a summing amplifier resulting in a gradiometric output signal without background channel noise. Constructing the gradiometer with different magnetometers on the array enables us to vary the baseline from 0.75 mm to 7.5 mm with 2/spl times/10/sup -12/ T//spl radic/Hz field resolution in an unshielded laboratory environment. This variable-baseline gradiometer can be used for NDE, biomagnetism and other applications.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
