Sliding Surface Fluorescence Imaging for Friction-Induced Changes
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Solution Overview
Problem
Existing methods for observing sliding body surfaces fail to account for temporal changes in transformed portions due to friction, which affect the coefficient of friction and seal performance in mechanical seals.
Innovation Solution
A method and apparatus that utilize electromagnetic waves to irradiate the sliding portion, detect fluorescence light emitted by transformed regions, and derive the increase of these regions using a confocal scanning microscope to visualize and evaluate chemical and geometric changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional light irradiation methods are used to observe sliding surfaces, then surface shape and oil film can be visualized, but transformed portions chemically and geometrically changed by friction cannot be observed
Solution Approach 1:
The patent utilizes fluorescence emission as a color/light change phenomenon to detect transformed portions. When the sliding body is irradiated with ultraviolet light, transformed portions emit fluorescence, allowing them to be visually distinguished from untransformed portions. This enables observation of chemical and geometric changes that occur during friction, resolving the limitation of conventional methods that cannot detect such transformed regions.
2Reliability
If the sliding body is made of ceramics, then durability and friction resistance are improved, but detection of transformed portions becomes more difficult
Solution Approach 1:
The patent introduces ultraviolet light as an intermediary to detect transformed ceramic portions. The ultraviolet light does not directly interact with the ceramic material in a way that produces detectable signals, but rather excites the transformed portions to emit fluorescence. This intermediary approach allows non-invasive detection of transformed regions in ceramic sliding bodies without affecting their friction resistance or durability.
3Duration of action of moving object
If fluorescence detection is used to observe transformed portions, then temporal changes can be tracked, but the complexity of the evaluation apparatus increases
Solution Approach 1:
The patent employs a confocal scanning microscope that serves multiple functions: it acts as both an optical microscope for imaging and a fluorescence detector for temporal change observation. By integrating these functions into a single apparatus, the patent reduces the overall system complexity compared to using separate devices for imaging and fluorescence detection, while still enabling comprehensive observation of transformed portions over time.
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 observation and evaluation of transformed portions, allowing for the assessment of friction reduction and the running-in phenomenon, thereby improving the understanding of sliding body performance.
Implementation Method 1
detecting fluorescence light emitted by a fluorescence region of the sliding portion, which is generated when the sliding portion is irradiated with the electromagnetic wave
Data Source
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AI summary
There is provided is sliding body surface evaluation method and apparatus configured so that a temporal change in a transformed portion at a sliding portion of a sliding body can be observed. The method includes a first step of irradiating, with an electromagnetic wave, a sliding portion 3a of a sliding body 3 sliding on a sliding target body 4, a second step of detecting light emitted from the sliding portion 3a irradiated with the electromagnetic wave, and a third step of deriving a change in a light emission state of the sliding portion 3a.