Digital signal conditioning solution for a magnetometer circuit
First Claim
1. A fluxgate magnetometer comprising:
- a fluxgate;
a digital processor in communication with the fluxgate, the digital processor including an analog to digital converter configured to digitize a back EMF signal from the fluxgate generating digitized back EMF signal, and a first signal generator configured to generate a fluxgate driving signal, wherein the digital processor is configured to reverse the sign of the digitized back EMF signal at a frequency corresponding to two times the frequency of the fluxgate drive signal.
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Abstract
A fluxgate magnetometer including a fluxgate and a digital processor. The digital processor includes an analog to digital converter for digitizing the back EMF from the fluxgate and a signal generator to generate the fluxgate driving signal. Further, a current sourcing circuit is provided to receive the fluxgate driving signal from the signal generator and transmit a current amplified driver signal to the fluxgate capable of driving the fluxgate in and out of saturation. The signal generator is a pulse width modulator used in conjunction with a voltage shaper and driver to create a triangle-shaped driving signal to excite the fluxgate. The digital processor is further configured to reverse the sign of the digital back EMF signal at a frequency corresponding to two times the frequency of the fluxgate driving signal thereby capturing only the second harmonic of the back EMF signal.
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Citations
24 Claims
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1. A fluxgate magnetometer comprising:
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a fluxgate; a digital processor in communication with the fluxgate, the digital processor including an analog to digital converter configured to digitize a back EMF signal from the fluxgate generating digitized back EMF signal, and a first signal generator configured to generate a fluxgate driving signal, wherein the digital processor is configured to reverse the sign of the digitized back EMF signal at a frequency corresponding to two times the frequency of the fluxgate drive signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A fluxgate magnetometer comprising:
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a fluxgate; a digital processor in communication with the fluxgate, the digital processor including an analog to digital converter configured to digitize a back EMF signal from the fluxgate generating digitized back EMF signal, and a first signal generator configured to generate a fluxgate driving signal; a current sourcing circuit configured to receive the fluxgate driving signal from the first signal generator of the digital processor, and transmit a current amplified driver signal to the fluxgate; a resistor connected in electrical series between the first signal generator and the current sourcing circuit, and a capacitor is in electrically parallel connection between the resistor and an electrical ground; and a second signal generator in electrical communication with the current sourcing circuit, wherein the current sourcing circuit includes a first, second, third, and fourth transistor, the first, second, third, and fourth transistor in electrical communication with the fluxgate. - View Dependent Claims (10, 11, 12)
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13. A sensor for measuring torque comprising:
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a fluxgate including a magnetic shaft mounted such that a torque may be applied causing a rotation of the shaft, such that a rotation of the shaft creates a back EMF in a coil; a digital processor in communication with the fluxgate, the digital processor including an analog to digital converter configured to digitize the back EMF signal from the fluxgate generating a digitized back EMF signal, and a first signal generator configured to generate a fluxgate driving signal, wherein the digital processor is configured to reverse the sign of the digitized back EMF signal at a frequency corresponding to two times the frequency of the fluxgate drive signal. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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21. A sensor for measuring torque comprising:
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a fluxgate including a magnetic shaft mounted such that a torque may be applied causing a rotation of the shaft, such that a rotation of the shaft creates a back EMF in a coil; a digital processor in communication with the fluxgate, the digital processor including an analog to digital converter configured to digitize the back EMF signal from the fluxgate generating a digitized back EMF signal, and a first signal generator configured to generate a fluxgate driving signal; a current sourcing circuit configured to receive the fluxgate driving signal from the first signal generator of the digital processor, and transmit a current amplified driver signal to the fluxgate; a resistor is connected in electrical series between the first signal generator and the current sourcing circuit, and a capacitor is in electrically parallel connection between the resistor and an electrical ground; and further comprising a second signal generator in electrical communication with the current sourcing circuit, wherein the current sourcing circuit includes a first, second, third, and fourth transistor, the first, second, third, and fourth transistor in electrical communication with the fluxgate. - View Dependent Claims (22, 23, 24)
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Specification