Device For Direct Microwave Measurement of Permeability as a Function of High DC Voltage

摘要

A sample holder and a coaxial method of measuring the permeability of magnetoelectric materials as a function of applied DC voltage are described. The sample holder reduces electromagnetic radiation losses as compared to conventional devices. The connections in the sample holder are electrically isolated from measuring equipment, preventing damage. A complementary algorithm to analyze the signal from the sample and calculate the permeability of the sample is described.

主权项

1. A method for measuring permeability comprising:
(i) providing a sat le in a sample holder comprising:
a doughnut-shaped sample positioned in electrical contact with an interior wall of a cylindrical conductive shield at a terminal end of the conductive shield;a conductive plate juxtaposed to the terminal end of the conductive shield, said conductive plate spaced apart and electrically isolated from the conductive shield and in electrical contact with the sample; anda conducting cable passing through a conducting end of the conductive shield and in electrical contact with the sample; (ii) connecting a conducting end of the cable to a permeability analyzer that emits an electric AC signal and collects a reflected electric AC signal from the sample in the sample holder; (iii) applying a DC voltage between the conductive shield and the conductive plate, establishing an electrical field across the sample; and (iv) calculating the permeability of the sample.