Radioactive Wear Measurement via Ion Beam Sputtering
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Solution Overview
Problem
Current methods for determining wear rates using radioactive isotopes in tribological processes face limitations, including low resolution and the need for activations above permissible levels, leading to inaccurate measurements and safety concerns, especially when measuring wear in the nanometer range.
Innovation Solution
A method and system for determining the depth profile of radioactive isotopes on a reference body with a defined concentration distribution, allowing for accurate wear rate measurements in the nanometer range without exceeding release values, using a sputtering system for layer removal and a gamma ray detector for activity measurement, enabling online wear determination with high resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the abrasion method is used to remove layers for depth profile determination, then material can be removed from the activated reference body, but significant mixing of more highly activated layers with less activated layers occurs and layer thickness can only be determined with low accuracy (order of magnitude, not better than about one micrometer)
Solution Approach 1:
The patent replaces mechanical removal methods (abrasion, rubbing, polishing, cutting) with ion beam sputtering. This substitution eliminates the mixing problem inherent in mechanical methods and enables precise layer thickness control in the nanometer range, directly resolving the contradiction between measurement precision and manufacturing precision.
Solution Approach 2:
The patent changes the removal mechanism from mechanical to physical (ion beam sputtering), and controls the removal process by adjusting ion beam parameters (energy, flux, duration) to achieve precise nanometer-scale layer removal without mixing, thereby improving both measurement and manufacturing precision.
2Measurement precision
If higher activation of the body to be measured is used to improve accuracy, then more signal is available for measurement, but disadvantages and dangers arise including exceeding permissible release values and increased safety concerns
Solution Approach 1:
The patent replaces mechanical abrasion with ion beam sputtering, which enables accurate depth profile determination with much lower radioactive activation. This substitution reduces the required activity level from exceeding release values to below release values, eliminating safety hazards while maintaining measurement precision.
Solution Approach 2:
The patent changes the activation level parameter from high (exceeding release values) to low (below release values) by improving the measurement methodology. This parameter change is made possible by the precise layer removal capability of ion beam sputtering, which maintains accuracy without requiring high activation levels.
3Productivity
If mechanical abrasion or polishing is used for layer removal, then material can be removed from the surface, but the ablated layer thickness can only be determined on the order of magnitude and not with higher accuracy
Solution Approach 1:
The patent replaces mechanical abrasion and polishing with ion beam sputtering. This substitution maintains productivity while dramatically improving manufacturing precision from order-of-magnitude accuracy to nanometer-scale precision, resolving the contradiction between removal efficiency and thickness precision.
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 accurate online wear rate measurements in the nanometer range with reduced radioactive activity below legal limits, improving measurement precision and safety by maintaining activities within permissible levels, allowing for precise conversion of activity to wear volume or height.
Implementation Method 1
the removal of a layer of material from the activated solid reference body by means of the action of ions, in particular by means of sputtering
Implementation Method 2
determining the activity of the removed material layer by means of a gamma ray detector
Implementation Method 3
acceleration of charged particles in a particle accelerator and irradiation of the solid reference body with the charged particles
Implementation Method 4
activation of nuclei located in the specimen through nuclear reactions with neutrons and charged particles (e.g. proton or deuteron radiation)
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a method and a measuring arrangement (10) for the tribometric, high-resolution online determination of wear on sample bodies (6), and a method and a measuring system for determining a depth profile of the activity of radioactive isotopes on a reference body (1). Said method includes: the preparation of a reference body (1) which is provided with radioactive isotopes in a defined concentration distribution below a licensing limit, in an activation region (2) close to the surface; the removal of a layer (x1-x7... xn) of material on a measuring region (3) of the reference body, which is intersected by the activation region (2); the determination of the thickness (?z) of the removed layer (x1-x7... xn) by comparison with reference marks (R1, R2, R3); the determination of the activity (A) of the removed material layer (x1-x7... xn) by measurement of the activity of the radioactive isotopes on the measuring region (3) of the reference body, before and after the removal of the material layer; and the insertion of the radioactive activity measuring values (A) and the layer thickness values (?z) of the removed material layers (x1-x7... xn) into an activity depth profile.