Magnetic Flux Sensor

Abstract

A device for measuring complex permeabilities, called a magnetic flux sensor, has been constructed from ferrite. Tests of the sensor which involve the imaginary part of the complex permeability are described in this paper. With a signal‐to‐null ratio of 2:1, the sensor can detect a change of resistance per unit resistance in metallic samples of 1.1×10⁻⁷, an electrical power absorption of 3.4×10⁻¹⁰ W, a radiant flux of 3.1×10⁻⁸ W/cm², and a temperature change of 4.9×10⁻⁵°K. Construction of the sensor is also described.