Coriolis Sensor Magnet Arrangement for Sensitivity
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Solution Overview
Problem
Coriolis measuring sensors with homogeneous magnetic fields struggle to detect relative movements between coil and magnet devices effectively, leading to low sensor sensitivity.
Innovation Solution
A Coriolis measuring sensor design featuring a magnetically conductive holder with opposing magnets arranged perpendicular to the coil's cross-sectional plane, increasing magnetic field strength and sensitivity to relative movements by merging and opposing magnetic fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a homogeneous magnetic field is used in the coil device, then the magnetic field structure is simple, but the sensor sensitivity to relative movements is poor
Solution Approach 1:
The patent applies local quality by creating a non-homogeneous magnetic field with specific spatial variations. Opposing magnets are arranged to generate a magnetic field with a zero-crossing line, creating regions of different field strengths and directions. This local variation in magnetic field properties enables the coil to detect relative movements through changes in magnetic flux, significantly improving sensor sensitivity while maintaining a manageable structural complexity.
2Measurement precision
If opposing magnets are arranged to create a non-homogeneous magnetic field, then sensor sensitivity improves, but the device complexity increases
Solution Approach 1:
The magnetic field generation is segmented into multiple opposing magnet pairs arranged around the coil. Each pair creates a localized magnetic field region, and the combination of these segmented fields produces the desired non-homogeneous field pattern with a zero-crossing line. This segmentation approach allows for modular construction and facilitates the achievement of high detection sensitivity through controlled magnetic field variations.
Solution Approach 2:
The patent employs asymmetry by arranging opposing magnets to create a magnetic field that is intentionally non-homogeneous. The magnetic field strength and direction vary asymmetrically across the coil's position, creating a distinct zero-crossing line. This asymmetric field configuration enables the detection of relative movements by measuring changes in magnetic flux, thereby improving sensor sensitivity while the symmetric arrangement of magnet pairs maintains reasonable device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design enhances sensor sensitivity to detect even small relative movements, significantly inducing electrical voltage in the coil device, resulting in improved detection of mass flow rate and density measurements.
Implementation Method 1
the magnets are respectively designed to cause a magnetic field perpendicular to a cross-sectional plane of the coil
Implementation Method 2
the magnet device has a magnetically conductive holder, in particular a ferromagnetic holder for magnets
Implementation Method 3
even small relative movements lead to a significant induction of an electrical voltage in the coil device
Data Source
AI summary
The invention relates to a Coriolis measuring sensor for detecting a mass flow rate or a density of a medium flowing through a measurement tube of the Coriolis measuring instrument. The measurement tube has an inlet and an outlet designed to convey the medium between the inlet and the outlet; an exciter; and two sensors; the measuring sensor comprising a supporting element having a chamber designed to house the measurement tube at least in portions. The magnet device comprises a magnetically conductive holder for magnets and a first pair of magnets arranged on the holder on a first face of the coil device, with the magnets designed to cause a magnetic field perpendicularly to a cross-sectional plane of the coil, and the magnetic field of a first magnet of the pair is oriented so as to be opposite to the magnetic field of a second magnet of the pair.