Towards fully digital magnetometer

Cerman, A.; Ripka, Pavel

doi:10.1016/s0924-4247(03)00128-6

Cited by 11 publications

(9 citation statements)

References 7 publications

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“…The feedback electronics can also introduce their own noise floor into the measurement process, and finally, a highamplitude, high-frequency, bias signals often increase the noise floor of the system. Others techniques include: pulse-position, pulse-height, and fully digital designs [11,34]. Pulse-position, in a fluxgate, for instance, keeps track of changes in the pulse positions of the voltage in the pickup coil, while pulseheight measures the differences between positive and negative peaks.…”

Section: Sensing Techniquesmentioning

confidence: 99%

Coupled overdamped bistable systems with applications to sensor devices

Kho

Longhini

et al. 2012

NOLTA

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Theoretical and experimental works have shown that coupling similar overdamped bistable systems can lead, under certain conditions that depend on the topology of connections and the number of units, to self-induced large-amplitude oscillations that emerge through a global bifurcation of heteroclinic connections between saddle-node equilibria. We have exploited this fundamental feature to model, design, and fabricate a new generation of highly-sensitive, low-powered, sensor devices, mainly detectors of magnetic-and electric-fields. In this article we review the fundamental principles and methods behind this new paradigm. These principles are device-independent so they can be readily adapted to a wide range of sensors, such as acoustic and gyroscopic sensors among many types. In this manuscript we describe the design and fabrication of a new class of highly-sensitive fluxgate-and electric-field magnetometers as a case study to review basic ideas and methods.

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Section: Sensing Techniquesmentioning

confidence: 99%

Coupled overdamped bistable systems with applications to sensor devices

Kho

Longhini

et al. 2012

NOLTA

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“…The FG is a non-linear sensor [1], which does not perform any inherent smoothing of the incident field, and a closed-loop measurement is necessary to increase the linear range of the sensor. Recent attempts to return a 1-bit magnetic field have shown linearity limitations [3,4]. Consequently, a low-pass filtering of the 1-bit IIR output is required for high resolution architectures.…”

Section: B Fully Low-pass Asic : Architecture and Designmentioning

confidence: 99%

“…While µFG exhibit a lower sensitivity and greater magnetic noise compared to fluxgate sensors, this can be partially counteracted by an increase of their excitation frequency. Digital signal interfaces [3] seem to be great candidates for µFG magnetometers, considering their simple implementation in regard to their higher performance and adjustability.…”

Section: Introductionmentioning

confidence: 99%

“…Though, while these architectures take the right path to miniaturization and digitalization, they still use designchallenging analog blocks [6]. Similarly, fully digital architectures based on the basic analog interface scheme are not adapted to portable microsystems [3]. In order to minimize the analog design requirements, a first approach consists in converting the signal directly at the sensor output.…”

Section: Introductionmentioning

confidence: 99%

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A Sigma-Delta closed-loop digital microfluxgate magnetometer

Gayral

Delevoye

Condemine

et al. 2006

2006 13th IEEE International Conference on Electronics, Circuits and Systems

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This paper presents the concept and the design of a new architecture for microfluxgate sensors. An innovative lowpass architecture based on pulsed excitation is presented, with a Σ∆-based closed-loop measurement circuit including digital and semi-digital filters. While the total power consumption is reduced to about 20mW, it also allows a power/resolution tradeoff for a digitally-controlled tunable magnetometer.

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“…The Overhauser magnetometer has a resolution of 0.01 nT and the power consumption is only 0.5 W at a sampling rate of 5 seconds, but it can also only perform scalar measurements of the magnetic field. Only the SQUID magnetometer is more sensitive than the fluxgate sensor among the current vector sensors [ 8 , 9 , 10 ]. Nevertheless, the high demand for liquid helium or nitrogen (for high temperature SQUIDs) and the limited dynamic range make their use limited.…”

Section: Introductionmentioning

confidence: 99%

Design of a Low-Cost Small-Size Fluxgate Sensor

Shen

Teng

2021

Sensors

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Traditional fluxgate sensors used in geomagnetic field observations are large, costly, power-consuming and often limited in their use. Although the size of the micro-fluxgate sensors has been significantly reduced, their performance, including indicators such as accuracy and signal-to-noise, does not meet observational requirements. To address these problems, a new race-track type probe is designed based on a magnetic core made of a Co-based amorphous ribbon. The size of this single-component probe is only Φ10 mm × 30 mm. The signal processing circuit is also optimized. The whole size of the sensor integrated with probes and data acquisition module is Φ70 mm × 100 mm. Compared with traditional fluxgate and micro-fluxgate sensors, the designed sensor is compact and provides excellent performance equal to traditional fluxgate sensors with good linearity and RMS noise of less than 0.1 nT. From operational tests, the results are in good agreement with those from a standard fluxgate magnetometer. Being more suitable for modern dense deployment of geomagnetic observations, this small-size fluxgate sensor offers promising research applications at lower costs.

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Towards fully digital magnetometer

Cited by 11 publications

References 7 publications

Coupled overdamped bistable systems with applications to sensor devices

Coupled overdamped bistable systems with applications to sensor devices

A Sigma-Delta closed-loop digital microfluxgate magnetometer

Design of a Low-Cost Small-Size Fluxgate Sensor

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