Two-Dimensional Sine Wave Annulus Grating for Rotating Platform Error Measurement
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Solution Overview
Problem
Current methods for inspecting the accuracy of rotating platforms in high-precision manufacturing are time-consuming and introduce errors due to off-line measurements, requiring suspension of manufacturing equipment and multiple correction processes, which increases uncertainty and decreases production efficiency.
Innovation Solution
An optical measurement system utilizing a two-dimensional sine wave annulus grating and a measurement unit with a light source, detector, and beam splitter to calculate radial and axial position variations, enabling real-time measurement of roll and pitch errors of rotating platforms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If off-line measurement instruments (laser interferometer, autocollimator, electronic level meter) are used to inspect rotating platform accuracy, then measurement precision can be achieved, but production time is lost due to equipment suspension and multiple correction processes
Solution Approach 1:
The patent replaces traditional mechanical/off-line measurement instruments with an optical measurement system that uses light beams and photoelectric detectors to measure rotating platform errors in real-time during operation, eliminating the need to suspend production for measurements
Solution Approach 2:
The measurement system enables continuous measurement of rotating platform errors during normal operation, allowing for real-time detection and correction without interrupting the production process, thus maintaining continuous useful action
2Measurement precision
If multiple correction processes are performed to correct rotating platform errors, then measurement precision may be improved, but measurement uncertainty increases and time is consumed
Solution Approach 1:
The patent implements a feedback mechanism where the optical measurement system continuously monitors rotating platform errors in real-time and provides immediate feedback for correction, eliminating the need for multiple iterative correction processes and reducing measurement uncertainty
Solution Approach 2:
The measurement system is integrated directly onto the rotating platform, allowing the platform to self-measure its own errors during operation without requiring external measurement instruments or multiple correction iterations
3Manufacturing precision
If traditional measurement instruments are installed and aligned for correcting rotating platforms, then geometric precision can be measured, but the process becomes very time-consuming
Solution Approach 1:
The patent replaces time-consuming mechanical alignment and installation processes with an integrated optical measurement system that automatically measures geometric precision during rotating platform operation, eliminating the need for manual instrument installation and alignment
Solution Approach 2:
The measurement system is pre-integrated onto the rotating platform structure, with measurement components already positioned and aligned during manufacturing, so that measurements can begin immediately during operation without requiring preliminary installation and alignment procedures
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 real-time error correction of rotating platforms, reducing production downtime and improving precision by integrating the measurement system directly into the rotating platform, thus enhancing manufacturing efficiency and accuracy.
Implementation Method 1
Each of the sine wave structures is adapted to reflect the light beam from the measurement unit back to the measurement unit
Implementation Method 2
The beam splitter is located on a transmitting path of the light beam from the light source and a transmitting path of the light beam reflected by the two-dimensional sine wave annuls grating, and adapted to transmit the light beam reflected by the two-dimensional sine wave annuls grating to the light detector
Implementation Method 3
The light detector receives the light beam reflected by each of the sine wave structures
Data Source
AI summary
An optical measurement system including a two-dimensional sine wave annuls grating and a measurement unit is provided. The two-dimensional sine wave annuls grating includes a rotary shaft and a plurality of sine wave structures surrounding the rotary shaft and continuously arranged. The measurement unit is adapted to output a light beam towards the two-dimensional sine wave annuls grating, wherein each of the sine wave structures is adapted to reflect the light beam from the two-dimensional sine wave annuls grating back to the measurement unit. A measurement method for errors of a rotating platform and a two-dimensional sine wave annuls grating are also provided.