title: Note: High resolution alternating current/direct current Harman technique.
abstract: This note describes the construction and engineering of a high precision Harman set-up for metrology of the thermoelectric figure of merit (ZT) of modules and materials based on steady state AC and DC measurements. The Harman technique presented in this article has a resolution of milli-ZT and it does not employ lock-in amplifiers or AC bridges; rather, the technique is developed to avoid typical complications experienced in AC Harman systems. By one-time reference measurements the best operation point for the system is chosen, minimizing the effects of capacitive loads due to AC signals.
authors.affiliation: Faculty of Engineering, University of Duisburg-Essen and CENIDE, Duisburg, Germany.
authors.forename: R
authors.initials: R
authors.lastname: Chavez
authors.forename: A
authors.initials: A
authors.lastname: Becker
authors.forename: M
authors.initials: M
authors.lastname: Bartel
authors.forename: V
authors.initials: V
authors.lastname: Kessler
authors.forename: G
authors.initials: G
authors.lastname: Schierning
authors.forename: R
authors.initials: R
authors.lastname: Schmechel