Magnetometer having a dynamically adjustable bias setting...

G - Physics – 01 – R

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G01R 33/02 (2006.01) G01C 17/30 (2006.01)

Patent

CA 2465826

A magnetometer includes at least one sensor (10) for sensing a magnetic field component, a biasing circuit (6), and a processor (1). The sensor (10) generates an output signal having a signal characteristic that varies in response to the sensed magnetic field component and in response to an applied bias. The biasing circuit (6) dynamically biases the sensor (10) in response to a bias setting signal. The processor (1) is coupled to receive the output signal from the sensor (10) and coupled to the biasing circuit (6). The processor (1) is operable to generate the bias setting signal (3) and thereby control the biasing circuit (6) to dynamically bias the sensor such that the signal characteristic of the output signal is maintained in a target range. The processor (1) determines the magnetic field component sensed by the sensor (10) as a function of the bias setting applied to the sensor.

L'invention concerne dans certains modes de réalisation un magnétomètre comprenant au moins un capteur servant à détecter un composant de champ magnétique, un circuit de polarisation et un processeur. Le capteur génère un signal de sortie présentant une caractéristique de signal qui varie en réponse au composant de champ magnétique détecté et en réponse à un signal de réglage de polarisation. Le processeur est couplé pour recevoir le signal de sortie du capteur et couplé au circuit de polarisation. Le processeur peut être utilisé pour générer le signal de réglage de polarisation et commander ainsi le circuit de polarisation afin de polariser dynamiquement le capteur de manière que la caractéristique de signal du signal de sortie soit maintenue dans une gamme cible. Le processeur détermine le composant de champ magnétique détecté par le capteur en fonction du réglage de polarisation appliqué au capteur.

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