Magnetoinductive magnetometers

[Atul Asthana]

A very recent development and probably not in much use, but seems promising (as per the descriptions below).

" Magnetoinductive sensors incorporate a coil surrounding a ferromagnetic core whose permeability changes within the earth's magnetic field. The coil serves as the inductive element in an oscillator, whose frequency is proportional to the magnetic field being measured. A DC current is provided to set the oscillator into its linear region. Directional change causes a shift in the oscillator frequency, enabling the magnetometer to provide directional and navigational feedback."

http://archives.sensorsmag.com/artic...1298/index.htm
http://itp.nyu.edu/physcomp/sensors/.../ThreeAxisMag2

US Patents : (download the PDF from pat2pdf.org)
5239264
6512370

[Atul Asthana]

Has any one made magnetoinductive sensors?

Has any one made a magnetoinductive sensor?

(a) What is the core material?
(b) What electronic circuit has been used?
(c) What has been the performance of the sensor? Noise, accuracy, repeatability, Thermal stability, alignment issues, usability issues, power requirements, mechanical design issues?

[Seeker]

Has any one made a magnetoinductive sensor?

(a) What is the core material?
(b) What electronic circuit has been used?
(c) What has been the performance of the sensor? Noise, accuracy, repeatability, Thermal stability, alignment issues, usability issues, power requirements, mechanical design issues?

Hi,
the core of this sensor is permaloy.
But I do not recomment use magnetoinductive sensor, for better results use Hall-sensors.