Tolerance Compensation based on Gaussian Processes for Angle Measurements with Magnetic Sensor Arrays

Schüthe, Thorben; Jünemann, Klaus; Riemschneider, Karl-Ragmar

doi:10.1109/sensors47125.2020.9278932

Cited by 2 publications

(1 citation statement)

References 14 publications

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“…It is widely used in civil engineering [1], mechanical manufacturing [2], geophysical observation [3] and aeronautical engineering [4]. The existing angle sensors are mainly divided into electric [5]- [7], magnetic [8]- [11] and optical fiber [12]- [15]. Optical fiber angle sensor [16]- [19] not only has the unique advantages of optical fiber sensor [20]- [22], such as against electromagnetic interference, but also has the measurement accuracy and sensitivity no lower than the first two [23]- [24].…”

Section: Introductionmentioning

confidence: 99%

An Omni-Azimuth Angle Sensor for Tilt Measuring Based on FBG Array

Cao

Zhang

et al. 2021

IEEE Photonics J.

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An omni-azimuth angle sensor for tilt measuring based on fiber Bragg grating (FBG) array is proposed. It is designed based on the sensitivity of FBG to axial traction. The sensor consists of a mass block and a cube frame connected by an FBG array. The FBG array consists of four FBGs. When the sensor is tilted at different angles, the axial traction of each FBG will change due to the pull of the mass block. The tilt angle of the sensing unit can be obtained by calculating the magnitude and direction of the resultant traction of the four FBGs. The array design and measurement theory of the sensor are introduced, and the sensitivity of the sensor is discussed. Experimental results show that the FBG array can be used to measure the omni-azimuth angle. The angle sensitivity varies unevenly with the tilt angle and the range of variation is 0.08 nm/° to 0.4593 nm/°. Using the spectrometer with an accuracy of 0.01nm, the angle resolution ranges from 0.125° to 0.0218°. The array effectively extends the measurement range of the tilt sensor, and reduces the number of FBGs as much as possible on the basis of achieving omni-azimuth angle measurement.

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Section: Introductionmentioning

confidence: 99%

An Omni-Azimuth Angle Sensor for Tilt Measuring Based on FBG Array

Cao

Zhang

et al. 2021

IEEE Photonics J.

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Signal Processing Using a Circular Sensor Array to Measure the Torsional Angle of a Bolted Joint

Schüthe,

Riemschneider,

Meyer-Eschenbach

2024

Sensors

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This study presents a new approach to determining the preload force of bolted joints. The concept involves measuring the torsional angle without contact. For this purpose, we present a circular magnetic sensor array integrated into the torque wrench. The torsional angle in bolted joints depends on the dimensions of the screw and the materials used and is typically less than four degrees. For this reason, one requirement is a high angular resolution so that a continuous recording of the torsion angle is feasible during the assembly process. This can be achieved using the circular sensor array and adapted signal processing methods. Two signal processing approaches are utilized. First, the direct method uses the discrete Fourier transformation to calculate the rotation angle from the signal phase. This approach is robust to signal distortion and does not depend on signal amplitude. Second, the method with a learning phase employs Gaussian process regression to minimize the angle error. In an experiment, both approaches were applied within a test bench and showed promising results. The direct method demonstrated a very good angular resolution without training and calibration. For mobile and less-complex applications where a reference system is unavailable, the direct method is preferable. However, in complex measurement systems where reference systems can be utilized initially, significant enhancements to an excellent resolution can be achieved through prior training.

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Tolerance Compensation based on Gaussian Processes for Angle Measurements with Magnetic Sensor Arrays

Cited by 2 publications

References 14 publications

An Omni-Azimuth Angle Sensor for Tilt Measuring Based on FBG Array

An Omni-Azimuth Angle Sensor for Tilt Measuring Based on FBG Array

Signal Processing Using a Circular Sensor Array to Measure the Torsional Angle of a Bolted Joint

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