Laser Range Finder Mounting for Pipe Distortion Detection
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Solution Overview
Problem
Existing methods for detecting distortion in high-temperature pipes used in thermal power plants and factories, such as those described in Patent Literature 1, lack versatility and precision due to the high cost of image analyzing devices and the difficulty in accurately predicting residual life without specifying the exact location of distortion.
Innovation Solution
A distance measuring method using a laser range finder and a mounting member with protruding parts and fitting holes, where the laser range finder is precisely positioned using pressing pins to measure changes in distance between a reflecting plate and the mounting member, allowing for regular detection of distortion in welds between metal members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an image analyzing device is used to detect distortion on the pipe surface, then distortion detection capability is improved, but device cost and complexity increase significantly
Solution Approach 1:
The patent replaces complex image analyzing devices with a simple laser range finder that measures distance changes. Instead of using expensive image processing equipment to detect surface unevenness, the invention uses a laser-based distance measurement system that tracks displacement of the pipe surface, substituting mechanical/optical measurement for complex visual analysis
Solution Approach 2:
The invention extracts only the essential measurement function needed for distortion detection - distance change measurement - from the complex image analyzing system. By using a laser range finder to measure only the displacement component, the system eliminates unnecessary complexity while retaining the core distortion detection capability
2Measurement precision
If a small area is analyzed for distortion, then measurement precision is improved, but the ability to predict residual life deteriorates due to inability to specify distortion location in advance
Solution Approach 1:
The patent divides the pipe surface into multiple measurement sections, each equipped with its own laser range finder and reference member. This segmentation allows simultaneous measurement of multiple locations, enabling both precise local measurement and comprehensive monitoring of distortion-prone areas for reliable residual life prediction
Solution Approach 2:
The invention transitions from analyzing only the surface topology (2D image analysis) to measuring distance changes in the third dimension (radial displacement). By measuring the displacement dimension perpendicular to the pipe surface, the system captures distortion information that cannot be obtained through surface imaging alone, enabling more accurate location identification and residual life prediction
3Stability of the object's composition
If the range finder is permanently installed on the pipe, then measurement stability is improved, but adaptability to different pipe locations and removal deteriorates
Solution Approach 1:
The patent creates a dynamic mounting system where the laser range finder can be temporarily attached to the pipe surface using adhesive tape or magnets during measurement, then easily removed. The reference member remains fixed to the pipe, while the range finder becomes movable, allowing flexible repositioning for different measurement locations while maintaining measurement stability during each measurement session
Solution Approach 2:
The invention introduces adhesive tape or magnets as intermediary elements between the range finder and the pipe surface. These intermediaries provide temporary, non-permanent attachment that allows easy installation and removal while maintaining sufficient stability during measurement, enabling the system to be adapted to different pipe locations without permanent modification
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 periodic detection of distortion in welds where creep deformation is likely, providing precise measurements without the need for permanent installation of the range finder, even in high-temperature environments.
Implementation Method 1
a light emitting portion configured to emit laser beams
Implementation Method 2
a light receiving portion configured to receive the laser beams which have been reflected by the reflecting plate
Data Source
Figure 1A~1B
Figure 2
Figure 3A~3B
AI summary
An embodiment discloses a distance measuring apparatus includes: a reference member configured to be installed on a surface of a first metal member; a range finder configured to measure a distance to the reference member; and a mounting member to which the range finder is configured to be placed, the mounting member being configured to be installed on a surface of a second metal member coupled to the first metal member via a weld, one of the mounting member and the range finder including first and second protruding parts, the other thereof including first and second fitting holes into which the first and the second protruding parts are configured to be fitted, respectively, such that the range finder is mounted to the mounting member, and first and second pressing members configured to press the first and second protruding parts from first and second directions toward inner side surfaces of the first and second fitting holes, respectively.