Crack Measurement Targets With Spherical Positioning for Multi-Axis Accuracy
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Solution Overview
Problem
Existing crack measurement devices are limited to single-axis measurements, prone to measurement errors due to dust and poor positioning, require multiple points of attachment, and are not suitable for long-distance measurements, making them susceptible to vandalism and impractical for eroded surfaces.
Innovation Solution
A system with hemispherical targets and rings for precise positioning, using drop-in anchors and epoxy adhesive for attachment, and a digital vernier for accurate distance measurement, along with accessories for measuring shear and misalignment, providing resistance to weather and vandalism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional linear positioning means are used, then the device can measure crack changes, but it is susceptible to vandalism and impractical for eroded surfaces
Solution Approach 1:
The patent applies spherical targets instead of traditional linear positioning elements. The spherical geometry provides inherent resistance to vandalism as it has no vulnerable edges or corners, and can be installed on eroded or irregular surfaces where linear fixtures would fail. The spherical shape distributes mechanical stress uniformly and is difficult to damage with conventional forces.
2Adaptability or versatility
If single-axis measurement devices are used, then the device structure is simple, but it cannot measure multi-axis crack changes and slip
Solution Approach 1:
The patent creates a universal measurement system where a single device with spherical targets and ring-based positioning can measure crack changes in any direction (multi-axis). The spherical geometry combined with ring positioning allows the same basic device configuration to capture displacement vectors in three-dimensional space, eliminating the need for multiple specialized single-axis gauges.
3Measurement precision
If traditional positioning means are used, then the device can be manufactured simply, but dust and poor positioning result in measurement errors
Solution Approach 1:
The spherical targets provide superior positioning accuracy compared to flat or linear surfaces. The curved surface allows for precise point contact with the ring positioning elements, minimizing the effect of dust particles. The spherical geometry enables self-centering behavior that reduces positioning errors, and any dust contamination affects the measurement minimally due to the point-contact nature of spherical interaction.
Data Source
AI summary
A system for measuring a changing crack, comprises: a measurement device comprising a body bearing a measurement instrument and having a first positioning means, and a movable member comprising a second positioning means; at least two targets that are able to cooperate with a positioning means, wherein the at least two targets are hemispherical in shape and wherein the positioning means consist of rings having a cross section that is smaller than the base section of the target.