Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1992-12-28
1996-05-21
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Magnetometers
324247, G01R 3302
Patent
active
055193188
ABSTRACT:
A triaxial magnetic heading sensing apparatus includes nulling coils and netoresistive sensors having inputs and outputs. The nulling coils are arranged in parallel relation to three orthogonal planes intersecting at a common center point. The sensors are disposed along orthogonal axes in parallel relation to the orthogonal planes and in close proximity to the center point. Each sensor has a bridge configuration balanced in the absence of an applied external magnetic field and unbalanced in the presence one. Also, a signal generator is connected to the inputs of the sensors for exciting the sensors with a bipolar voltage waveform exhibiting alternating positive and negative voltage polarities punctuated by "off" states of zero volts. Further, a voltage integrator and low pass filter are connected in series with the output of a respective one of the sensors for generating an error signal representative of an imbalance due to the presence of an applied external magnetic field and for coupling the input and output of each nulling coil and of each sensor into a servo control loop such that each sensor is driven by the error signal to a magnetic nulling condition with zero steady state error. A pick-off resistor is connected to the output of the low pass filter for outputting a representation of the nulling current to provide a measure of the applied external magnetic field.
REFERENCES:
patent: 4656750 (1987-04-01), Pitt et al.
Philips Components, Data Sheets--3 pages "Magnetic Field Sensor" Dec. 1989.
Koerner Steve J.
Lifur Anthony E.
Wall Michael J.
Gilbert Harvey A.
Hampsch Robert J.
Snow Walter E.
The United States of America as represented by the Secretary of
LandOfFree
Triaxial magnetic heading sensing apparatus having magnetaresist does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Triaxial magnetic heading sensing apparatus having magnetaresist, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Triaxial magnetic heading sensing apparatus having magnetaresist will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2040759