Indentation Instrument Topographic Imaging via Integrated Reference Structure
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Solution Overview
Problem
Existing indentation testing systems require additional sensors and complex setups to perform topographic measurements, increasing cost and complexity, and often suffer from reduced precision due to the large distance between the indenter and measurement tip.
Innovation Solution
An indentation instrument with a topographic tip integrated into a reference structure, using a feedback control system and existing sensors to maintain constant interaction with the sample surface, allowing for precise topographic imaging and profiling without additional measurement modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an AFM tip is integrated with the indenter to reduce distance, then measurement precision is improved, but device complexity increases due to requiring dedicated AFM sensors
Solution Approach 1:
The indenter is designed to serve dual functions: performing indentation testing and acting as a reference structure for topographic measurements. The existing force sensor on the indenter is utilized for both force measurement during indentation and as a reference for topographic profiling, eliminating the need for separate dedicated AFM sensors and reducing system complexity while maintaining measurement precision
Solution Approach 2:
The indentation system performs its own topographic measurements by using its existing components (indenter, force sensor, actuators) for both indentation testing and subsequent topographic profiling, rather than requiring external or additional specialized measurement systems
2Adaptability or versatility
If a bolt-on AFM module is used for topographic measurements, then measurement capability is added, but the distance between indenter and tip increases requiring large sample displacements
Solution Approach 1:
The topographic measurement capability is merged with the indentation system by integrating the measurement function into the indenter assembly itself. The indenter serves as both the testing tool and the reference structure, with the topographic tip positioned close to the indenter tip, eliminating the need for large sample displacements and reducing the overall system footprint
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
Enables precise topographic measurements using existing sensors, reducing complexity and cost, and improving precision by maintaining constant interaction with the sample surface, facilitating both indentation and topographic data collection.
Implementation Method 1
a feedback control system, which is adapted to control the second actuator based on detection of a surface of a sample by the topographic tip
Implementation Method 2
a relative position sensor adapted to determine a relative position of the indenter with respect to the reference structure
Data Source
AI summary
Measuring a topographic profile and/or a topographic image of a surface of a sample includes positioning an indenter out of contact with a sample and in a constant position with respect to a headstock; positioning a topographic tip to detect a surface of the sample and positioning a reference structure at a predetermined distance from said surface; measuring the relative position of the indenter with respect to the reference structure by a relative position sensor; translating said sample perpendicular to said longitudinal axis while maintaining the reference structure at said predetermined distance from the surface of the sample by the feedback control system and the second actuator while measuring the relative position of the indenter with respect to the reference structure by the relative position sensor; and generating a topographic profile and/or a topographic image based on measurements of the relative position.