Segmented Piezoelectric Measuring Element Reducing Transverse Force Crosstalk
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Solution Overview
Problem
Piezoelectric measuring elements made of crystal symmetry class 32, used to measure forces perpendicular to the x-y plane, experience crosstalk and generate interference signals when transverse forces occur, leading to systematic measurement errors, especially in applications like milling and planing where transverse forces are significant.
Innovation Solution
The measuring element is divided into identical segments with straight flanks and narrow gaps in the x-y plane, with crystal orientations aligned parallel or orthogonally to each other, reducing interference signals caused by transverse forces without compromising resilience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a piezoelectric measuring element made of crystal symmetry class 32 is used to measure forces perpendicular to the plate surfaces, then the measuring element is well-suited for measuring normal forces, but crosstalk occurs when transverse forces act orthogonally, generating interference signals
Solution Approach 1:
The measuring element is divided into four identical segments with straight flanks, separated by narrow slits. This segmentation reduces the crosstalk effect of transverse forces by distributing the piezoelectric material in a way that minimizes the generation of interference signals while maintaining the ability to measure normal forces accurately.
2Object-generated harmful factors
If the measuring element is divided into segments with narrow slits, then crosstalk is reduced, but the structural integrity and load-bearing capacity may be compromised
Solution Approach 1:
The segments are equipped with different crystal orientations (parallel or orthogonal to each other) to create local variations in piezoelectric response. This allows each segment to contribute differently to the overall measurement, reducing crosstalk while maintaining sufficient structural integrity through the segmented design.
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
This configuration significantly reduces crosstalk and interference signals, minimizing measurement errors by approximately halving or eighth-ing the amplitude of interference signals, while maintaining the load-bearing capacity of the measuring element.
Implementation Method 1
a piezoelectric measuring element made of a crystal of symmetry class 32, in particular quartz, flat in a plane xy for installation in a measuring body for measuring a force Fz acting perpendicular to the plane xy. Such a force Fz causes a charge accumulation on the force-absorbing surfaces of the measuring element, which is provided with electrodes.
Data Source
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Figure 5~6
AI summary
The invention relates to a measuring element made of a piezoelectric crystal of symmetry class 32 for measuring a force Fz, which acts perpendicularly on the plane x-y, wherein a force Fz causes a charge accumulation on surfaces (5, 5') of the measuring element receiving the force. Applications are measurements in which transverse forces Fxy orthogonal to the force Fz, which generate an error signal at the measuring element, are expected on the measuring body (2). According to the invention the measuring element consists of at least four, preferably eight, identical measuring element segments (7) having straight edges (8, 8'), wherein in the x-y plane the segments (7) are arranged side by side and close together, spaced apart by narrow gaps (9) at the edges (8, 8'), wherein together said segments form the shape of a disc or perforated disc (10) for reducing the interference signals caused by the transverse forces Fxy on the measuring element. In addition, the crystal orientations (11) in the x-y plane of all segments (7) are oriented in the same direction or orthogonal to each other.