Fiber Optic Surface Roughness Measurement Device
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Solution Overview
Problem
Conventional surface roughness measurement techniques are inadequate for measuring inner surfaces of small components or those with complex geometries, as they are often destructive, costly, time-consuming, and fail to accurately distinguish machining mark direction or account for material reflectivity and vibration variations.
Innovation Solution
A surface roughness measurement device employing a fiber bundle with a main emitting fiber, multiple collecting fibers, auxiliary emitting fibers, optical housing, and reflective mirrors, along with an external circuit to generate and process laser beams for precise surface roughness calculations, capable of accessing difficult areas and compensating for material reflectivity and vibration influences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional contact measurement methods are used for inner surfaces, then measurement can be performed, but the process becomes destructive and time-consuming
Solution Approach 1:
The patent replaces mechanical contact measurement methods with an optical measurement system using laser beams and fiber optics. The laser beam reflects off the surface and is captured by collecting fibers, eliminating the need for physical contact and significantly reducing measurement time while maintaining precision for inner surfaces and complex geometries
2Measurement precision
If conventional measurement techniques are used for difficult access areas, then measurements can be obtained, but the cost increases and the process becomes complex
Solution Approach 1:
The patent uses fiber optics as an intermediary to transmit laser beams to difficult access areas and bring reflected light back to the detection system. This allows measurements in narrow slots and complex geometries without requiring complex measurement equipment to physically access these areas, simplifying the overall system while maintaining measurement capability
Solution Approach 2:
The optical measurement system serves multiple functions: it can measure various surface types (inner surfaces, outer surfaces, complex geometries), works in difficult access areas, and provides non-destructive measurement. This multi-functionality reduces the need for multiple specialized measurement systems, lowering overall complexity and cost
3Measurement precision
If conventional roughness measurement techniques are used, then surface roughness can be measured, but material reflectivity variation and vibration influence cannot be eliminated
Solution Approach 1:
The patent employs auxiliary emitting fibers that send reference laser beams along the same optical path as the measurement beams. By comparing the reference signals with the measurement signals, the system can detect and compensate for variations caused by material reflectivity changes and vibrations, maintaining measurement consistency and reliability under varying conditions
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 device provides precise surface roughness measurements in challenging environments, reducing costs and time, while accurately determining machining mark direction and minimizing the impact of material reflectivity and vibration variations.
Implementation Method 1
a main reflective mirror (15) arranged in the optical housing (14), and used for reflecting light emitted from the main emitting fiber (122) to a detecting point of an aperture (142) of the optical housing (14) and reflecting light scattered by the object (20) to the multiple collecting fibers (124)
Implementation Method 2
an auxiliary reflective mirror (16) arranged in the optical housing (14), and used for reflecting light emitted from the auxiliary emitting fiber (13) to the detecting point of the aperture (142)
Implementation Method 3
reflecting light scattered by the object (20) to the multiple collecting fibers (124)
Data Source
AI summary
A surface roughness measurement device that in one embodiment includes main and auxiliary emitting fibers, multiple collecting fibers, an optical housing, main and auxiliary reflective mirrors, and an external circuit. The optical housing includes the fibers and defines an aperture for optically contacting a surface of an object. The main reflective mirror is arranged in the optical housing, for reflecting light emitted from the main emitting fiber to a detecting point of the aperture and reflected light by the object to the collecting fibers. The auxiliary reflective mirror is arranged in the optical housing, for reflecting light emitted from the auxiliary emitting fiber to the detecting point. The external circuit is for generating a laser beam to the main and auxiliary emitting fibers, collecting the reflected light from the collecting fibers, and calculating the surface roughness of the object based on the collected reflected light.