Laser Triangulation for Brake Lining Geometric Inspection
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Solution Overview
Problem
Visual inspection of brake pads in disc brake devices is inadequate for detecting assembly errors and manufacturing deviations, as it is two-dimensional and cannot reliably capture all details, leading to potential operational issues.
Innovation Solution
A non-contact optical laser triangulation method is used to detect geometric properties of brake pad components before initial operation, allowing for precise and reliable measurement of assembly errors by comparing components with specified target values, using a laser to project light and image reflected light onto a detector for triangulation-based evaluation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If visual inspection is used to detect assembly errors, then the inspection process is simple and quick, but the detection precision and reliability are insufficient
Solution Approach 1:
The patent replaces the manual visual inspection system with an automated optical measurement system using laser triangulation. The laser projector projects structured light patterns onto the brake pad components, and the camera captures the reflected light to automatically measure geometric properties, eliminating the limitations of human visual inspection while achieving high precision detection of assembly errors and manufacturing deviations.
Solution Approach 2:
The patent introduces laser light as an intermediary medium between the inspection system and the brake pad components. The structured light patterns serve as a mediator that interacts with the component surfaces, encoding spatial information that can be decoded by the camera system to extract precise geometric measurements, thereby enabling non-contact high-precision measurement.
2Reliability
If visual inspection is used, then the inspection method is simple to implement, but it cannot detect defects perpendicular to the image plane
Solution Approach 1:
The patent transitions from two-dimensional visual inspection to three-dimensional optical measurement. By projecting structured light patterns and capturing their deformation upon reflection from component surfaces, the system reconstructs three-dimensional geometric information, enabling detection of defects in all spatial directions including those perpendicular to the original image plane, thus achieving comprehensive defect detection.
3Manufacturing precision
If visual inspection is performed by production personnel, then no additional equipment is needed, but manufacturing deviations cannot be identified
Solution Approach 1:
The patent replaces subjective human visual assessment with objective automated optical measurement. The laser triangulation system provides quantitative geometric data that can be directly compared against manufacturing specifications and target values, enabling precise identification of manufacturing deviations without relying on human judgment or experience.
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
This method enables the detection of assembly errors and manufacturing deviations with high precision, ensuring correct assembly and preventing operational issues by providing detailed, three-dimensional analysis of brake pad components.
Implementation Method 1
a laser (25) projects a light point onto a brake pad (1, 1') or onto at least one component of the components of a brake pad (1, 1')
Implementation Method 2
the light reflected from this brake pad (1, 1') or from at least one component of the components of a brake pad (1, 1') in an observation direction (29) is imaged onto a light-receiving element (31)
Implementation Method 3
Based on the angle between the illumination direction (27) and the observation direction (29), the type of the brake pad component is determined through triangulation
Data Source
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AI summary
The invention relates to a use of a contactlessly working optical laser triangulation method for detecting at least one geometric property of a brake lining (1, 1') of a disc brake of a vehicle and/or of at least one component of the components of the brake lining (1, 1') before an initial commissioning or before an assembly of the brake lining (1, 1') and/or the at least one component of the components of the brake lining (1, 1') in the disc brake.