Chromatic Confocal Sensor for Thin-Wall Rotating Body Inspection
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Solution Overview
Problem
Current methods struggle to accurately and efficiently detect the surface shapes and thickness distribution of the inner and outer walls of thin-walled rotating bodies with complex characteristics, such as high length-diameter and depth-width ratios, due to mechanical interference and limitations in existing optical detection techniques.
Innovation Solution
A method and device utilizing a chromatic confocal sensor head driven by linkage of rotary tables and a linear motion shaft for copy scanning, enabling single-pass detection of surface shapes and thickness distribution by controlling the sensor head to scan along the contour normal of the thin-walled rotating body, with compensating measurements for high precision and universality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing optical detection methods such as laser interferometers are used, then measurement capability is provided, but the return light cannot be collected due to complex device characteristics
Solution Approach 1:
The detection system is divided into multiple independent detection heads (first detection head for outer wall, second detection head for inner wall), each optimized for specific measurement tasks. This segmentation allows each head to independently collect light from its target surface without interference from the complex overall structure.
Solution Approach 2:
A beam splitter is introduced as an intermediary optical element to separate and redirect light paths. The beam splitter enables the detection system to collect return light from different surfaces (inner and outer walls) by directing light beams along different paths, solving the light collection problem in complex geometries.
2Measurement precision
If coordinate measuring machines or surface profilers are used, then detection capability is provided, but mechanical structure interference prevents effective detection
Solution Approach 1:
The patent replaces mechanical contact-based measurement systems (coordinate measuring machines, surface profilers) with a non-contact optical detection system. This substitution eliminates mechanical structure interference entirely, as the optical detection heads can measure surfaces without physical contact or mechanical support structures that would obstruct the measurement path.
3Ease of operation
If single-side scanning is performed to avoid mechanical interference, then detection capability is maintained, but simultaneous detection of inner and outer walls is not achieved
Solution Approach 1:
The patent combines multiple detection functions into a single integrated detection system. The first and second detection heads are mounted on the same moving platform and controlled by a unified control system, allowing simultaneous detection of both inner and outer walls during a single scanning operation. This merging achieves high productivity while maintaining operational simplicity through centralized control.
Solution Approach 2:
The detection system is designed with multi-functionality to detect both inner and outer wall surfaces using the same basic platform and control mechanism. The universal design allows the system to adapt to different measurement tasks (inner wall, outer wall, or both) without requiring separate detection systems, thereby improving efficiency while keeping operations straightforward.
4Measurement precision
If traditional detection methods are used, then individual surface detection is possible, but simultaneous detection of surface shapes and thickness distribution is not achieved
Solution Approach 1:
The detection system performs continuous measurement of both surface shape and thickness information during a single scanning operation. The detection heads continuously capture optical data from both inner and outer walls throughout the scanning process, ensuring no information is lost and both types of measurements are obtained simultaneously and consistently across the entire surface.
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 approach allows for high-precision, high-efficiency detection of inner and outer wall surface shapes and thickness distribution, overcoming mechanical interference and ensuring coordinate consistency, suitable for various thin-walled rotating bodies like conformal fairings and hemispherical gyro harmonic oscillators.
Implementation Method 1
a chromatic confocal sensor head is driven to perform copy scanning on the thin-walled shell-type rotating body
Data Source
AI summary
Disclosed are methods and devices for simultaneously detecting surface shapes and thickness distribution of inner and outer walls of a thin-walled rotating body. According to the invention, a chromatic confocal senor head is driven by a bottom rotary table, a main measuring head rotary table and a linear motion shaft mover to perform copy scanning along a surface of a thin-walled shell-type rotating body, so that the detection of the surface shapes and thickness distribution of the inner and outer walls of the thin-walled shell-type rotating body can be realized at the same time. By the method, mechanical interference caused by arranging a measuring head in the thin-walled shell-type rotating body can be avoided, and coordinate consistency of surface shape measurement data and thickness distribution data of the inner and outer walls in a three-dimensional space can be ensured, thus ensuring the overall measurement precision; and meanwhile.