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Physics Colloquia

October 2021

Physics Colloquium – Mark Williamsen

October 29 @ 2:00 pm - 3:30 pm
KIRC 1150, 3135 N. Maryland Ave.
Milwaukee, WI 53211 United States

Mark Williamsen, Quantum Design, Inc

Applications of AC Bridges in Cryogenic Measurements

AC (alternating current) bridges have proven to be useful in making precise measurements at low temperature, including thermometry as well as length change with respect to either thermal expansion (dilatometry) or applied magnetic field (magnetostriction). Techniques now in use allow one leg of the bridge to be placed at the cryogenic sample site while the other legs remain at room temperature, with the intervening temperature gradient being imposed along a length of coaxial cable.

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