Laser Displacement Measurement for High Speed Fiber Testing
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Solution Overview
Problem
Current methods for measuring high speed displacement, such as high speed tensile tests on high strength fibers, face challenges in precision due to external factors like slip and noise, especially when measuring minute displacements of thin specimens, leading to inaccurate strain rate measurements.
Innovation Solution
A method and apparatus using a uniform intensity laser line to measure displacement by detecting differences in laser transmission as the specimen deforms, with a laser line generator forming a uniform intensity laser line and a photodetector measuring the transmission changes, allowing precise displacement measurement and high response speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If displacement sensors or strain gauges are used to measure strain rate in high speed tensile tests, then measurement capability is provided, but measurement precision deteriorates due to slip, noise, and inability to measure minute displacements
Solution Approach 1:
The patent replaces mechanical measurement systems (displacement sensors, strain gauges) with an optical measurement system using laser transmission. The laser beam passes through the test specimen, and changes in transmission intensity are detected by a photodetector to measure displacement, eliminating mechanical contact and associated problems like slip and noise
Solution Approach 2:
The patent introduces a laser beam as an intermediary between the test specimen and the measurement system. The laser transmission intensity serves as a mediator that translates physical displacement into measurable optical signal changes, enabling precise non-contact measurement
2Measurement precision
If conventional laser measurement methods using straight propagation or interference are used, then displacement measurement is possible, but precision deteriorates for thin specimens due to external factors
Solution Approach 1:
The patent replaces conventional laser measurement methods (straight propagation, interference) with a laser transmission method where the laser beam passes through the specimen. This substitution eliminates sensitivity to environmental noise and mechanical slip, providing stable measurement for thin specimens
Solution Approach 2:
The patent changes the measurement parameter from optical path length or interference patterns to laser transmission intensity. By measuring changes in transmission intensity as the specimen deforms, the system achieves precise measurement of minute displacements without being affected by external factors
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 precise measurement of high speed displacement and strain rate of thin specimens, improving the reliability of high speed tensile data and reducing development time and costs by overcoming limitations of existing methods.
Implementation Method 1
a laser generating device configured to generate a laser beam
Implementation Method 2
a laser line generator configured to form a uniform intensity laser line by defocusing the focused laser beam
Implementation Method 3
a photodetector configured to measure the transmission amount of the focused laser line
Data Source
AI summary
The present invention relates to a method and apparatus for measuring precise high speed displacement, and more particularly, to a method and apparatus for measuring precise high speed displacement, which measures displacement of a test specimen by using a uniform intensity laser line and by using differences in a laser transmission amount according to the deformation of the test specimen, and measures a strain rate of the test specimen such as high strength fiber or the like using a high speed tensile test.