Measuring Probe Strain Detection via Segmented Stiffness
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Solution Overview
Problem
Conventional measuring probes with high stiffness detection element supporting parts result in low measuring force and small deformation, making it difficult to obtain sufficient outputs for accurate surface shape measurement.
Innovation Solution
A measuring probe design featuring a stylus with a contact part, a probe housing, and detection elements, including supporting members and a coupling shaft that allow attitude changes, with the detection element positioned to detect strain in the supporting member farthest from the rotational center, ensuring high sensitivity through controlled stiffness and displacement mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the detection element supporting part is made with high stiffness, then the structural stability is improved, but the deformation amount becomes small resulting in insufficient detection output
Solution Approach 1:
The supporting structure is divided into multiple supporting members (first, second, third, and fourth supporting members) arranged at different positions. Each supporting member has different stiffness characteristics, allowing the system to maintain overall stability while creating localized deformation zones that generate sufficient detection output.
Solution Approach 2:
Different supporting members are designed with different stiffness properties. The first and second supporting members have higher stiffness to maintain structural stability, while the third and fourth supporting members have lower stiffness to generate measurable deformation. This local differentiation resolves the contradiction between overall stability and local detection sensitivity.
2Strength
If the detection element supporting part is made with high stiffness, then the structural strength is improved, but the measuring force becomes low resulting in small deformation
Solution Approach 1:
The supporting structure is segmented into multiple members with different stiffness characteristics. This segmentation allows the system to distribute forces appropriately - stronger members bear the structural load while weaker members respond to measuring forces, resolving the contradiction between structural strength and measuring force sensitivity.
Solution Approach 2:
Different supporting members are assigned different stiffness levels to perform different functions. The higher-stiffness members provide structural strength, while the lower-stiffness members are optimized for detecting measuring forces. This local quality differentiation enables both strong structural support and sensitive force measurement simultaneously.
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 achieves high measurement sensitivity while maintaining a simple structure, allowing for precise detection of surface shapes with reduced noise and increased accuracy.
Implementation Method 1
detect a strain amount of the supporting member
Data Source
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AI summary
A measuring probe(300) includes: a stylus(336) having a contact part (362) to be brought into contact with an object to be measured; a probe housing(300) capable of supporting the stylus(336) on an axial center(O); and a detection element(325) capable of detecting a movement of the contact part(362). The measuring probe (300) further includes: two supporting members (322, 324) disposed in an axial direction(O) of the probe housing(306), the supporting member(322, 324) allowing for an attitude change of the stylus (336) ; and a coupling shaft (326) for coupling the two supporting members(322, 324) together. The detection element(325) is disposed in one of the two supporting members(322, 324) that is farthest away from a rotational center position (RC) of rotation generated in the stylus (336) when a measuring force (F) is applied to the contact part (336) from a direction perpendicular to the axial direction(O), to detect a strain amount of the one of the two supporting members(322, 324). The measuring probe(300) having a simple structure and capable of ensuring high measurement sensitivity is thus provided.