The precision of gastric motility and volume sensing by implanted magnetic sensors

Tomek, Jiří; Mlejnek, Pavel; Janásek, V.; Ripka, Pavel; Kašpar, Petr; Chen, J.

doi:10.1016/j.sna.2007.04.020

Cited by 11 publications

(10 citation statements)

References 7 publications

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“…The maximum realistic range for industrial applications is 20 to 50 m. For this purpose, we estimate the magnetic moment of the coils to be about 10 Am 2 , which gives us a sufficient magnetic field (about 10 nT in 20 meters) for a 0.5 meter distance error. This means that a 1000-turn coil should have a cross sectional area A of 100 cm 2 , and an excitation current of 1 A.…”

Section: Discussionmentioning

confidence: 99%

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A magnetic distance sensor with high precision

Zikmund

Ripka

2012

Sensors and Actuators A: Physical

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A magnetic distance sensor working at very low frequency has been developed to measure distances up to 1 m. The principle is similar to that of the 3-D magnetic tracker, but the system is optimized to minimize the error in distance for static measurements. The system is not affected by conductive objects. The uncertainty caused by noise and interference is below 2 mm, even in a noisy environment. The measurement time of 3 minutes can be decreased to 1 minute, depending on the amplitude of the interferences and the required accuracy. After applying corrections, systematic error of 5 mm was achieved by using a calibration model. The system is scalable up to 20 m range.

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Section: Discussionmentioning

confidence: 99%

“…In order to reduce this error below 10% for any angular position, we employed a 3-axial detection coil [2]. This approach greatly reduces the angular misalignment error, because the entire vector is known.…”

Section: Introductionmentioning

confidence: 99%

A magnetic distance sensor with high precision

Zikmund

Ripka

2012

Sensors and Actuators A: Physical

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“…The position error is 1% for 240 mm distance. Similar sensors with solenoid coils developed for biomagnetic applications are described in [22]. A tri-axial miniature receiving coil was used to correct for angular mismatch between the transmitter and receiver coils.…”

Section: Linear Inductance and Transformer Sensorsmentioning

confidence: 99%

“…A system for measuring gastric activity in vivo. (a) A pair of implantable coils is attached to the gut; (b) output voltage vs. distance-from[22] with permission from Elsevier.…”

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confidence: 99%

Inductive Position and Speed Sensors

Ripka

Blažek

Mirzaei

et al. 2019

Sensors

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Magnetic position and speed sensors are rugged and durable. While DC magnetic sensors use permanent magnets as a field source and usually have only mm or cm range, inductive sensors use electromagnetic induction and they may work up to a distance of 20 m. Eddy current inductive sensors equipped with magnetoresistive sensors instead of inductive coils can operate at low frequencies, allowing detection through a conductive wall. In this paper, we make an overview of existing systems and we present new results in eddy current velocity and position measurements. We also present several types of inductive position sensors developed in our laboratories for industrial applications in pneumatic and hydraulic cylinders, underground drilling, large mining machines, and for detecting ferromagnetic objects on conveyors. While the most precise inductive position sensors have a resolution of 10 nm and linearity of 0.2%, precision requirements on the industrial sensors which we develop are less demanding, but they should have large working distance and large resistance to environmental conditions and interference.Sensors 2020, 20, 65 2 of 15 Eddy Current Inductive SensorsAn advantage of eddy current position and speed sensors is that they do not require a ferromagnetic target: Any conducting material can be used.Author Contributions: Conceptualization, P.R. and J.B.; design, calculations, and measurements: M.M., P.L., M.Š., and K.D.; writing-original draft preparation, P.R. and J.B.; writing-review and editing, all authors.

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“…Basic accuracy was 1 mm at 5 cm distance and 5 mm at 10 cm distance. In order to measure distance for arbitrary position we used 3-axial detection coil [7]. Similar system using AMR sensors was described in [8].…”

Section: Fully Magnetic Trackersmentioning

confidence: 99%

Long-range magnetic tracking

2012

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Two magnetic trackers are described in this paper. The first one is fully magnetic and has 1 meter range. This device can measure distance with 1 mm resolution and 1 cm total accuracy. The second system is a hybrid tracker using active magnetic ranger, three optical gyros and three micromachined inclinometers. It has 15 m range and for distances below 5 m the position accuracy is 50cm. The heading error is below 0.1 deg. .

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The precision of gastric motility and volume sensing by implanted magnetic sensors

Cited by 11 publications

References 7 publications

A magnetic distance sensor with high precision

A magnetic distance sensor with high precision

Inductive Position and Speed Sensors

Long-range magnetic tracking

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