Multi-Degree-of-Freedom Error Measurement for Movable Platforms
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Solution Overview
Problem
Current laser interferometers can only measure one error at a time, leading to time-consuming and costly ex-factory calibration processes for machine tools, increasing production costs and reducing efficiency.
Innovation Solution
A method and apparatus using a light-source module, lens module, and optoelectronic sensing modules to calculate alignment, straightness, and angle errors of a movable platform in multiple degrees of freedom through non-interference trigonometric ranging and geometric optics principles, allowing simultaneous measurement of multiple errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If laser interferometer is used to measure errors, then measurement precision is improved, but measurement speed deteriorates due to sequential measurement requirement
Solution Approach 1:
The patent segments the measurement function by using multiple independent optoelectronic sensing modules (first, second, third, and fourth sensing modules) that simultaneously measure different error components (alignment error, straightness errors, and angle errors) of the movable platform, eliminating the need for sequential measurements while maintaining high precision
Solution Approach 2:
The patent transitions from one-dimensional sequential measurement to multi-dimensional simultaneous measurement by arranging multiple sensing modules in different spatial positions and orientations, allowing parallel measurement of multiple error parameters across different degrees of freedom
2Measurement precision
If laser interferometer is used to measure errors, then measurement precision is improved, but device cost increases
Solution Approach 1:
The patent replaces expensive laser interferometer equipment with relatively inexpensive optoelectronic sensing modules that can perform the required measurements, making the measurement system more cost-effective while maintaining adequate precision for ex-factory calibration
Solution Approach 2:
The patent creates a universal measurement system where multiple optoelectronic sensing modules serve multiple measurement functions simultaneously (alignment, straightness, and angle measurements), replacing the need for specialized expensive equipment for each measurement type
3Measurement precision
If multiple measurements are performed to measure multiple errors, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The patent enables continuous simultaneous measurement of multiple error parameters through multiple sensing modules operating in parallel, eliminating the interruptions and time losses associated with sequential measurements while maintaining measurement precision
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 faster and more cost-effective ex-factory calibration by simultaneously measuring multiple errors, enhancing production yield and efficiency without the need for multiple measurements.
Implementation Method 1
a light-source module disposed on a fixed platform emits light to a lens module disposed on a movable platform. The light is reflected from the lens module to one or more optoelectronic sensing module disposed on the fixed platform
Implementation Method 2
a processing unit then calculates the alignment error or/and straightness error or/and angle error of the movable platform according to the signal generated by the optoelectronic sensing module upon receiving the light
Data Source
AI summary
The present invention relates to a method and an apparatus for measuring errors of a movable platform in multiple degrees of freedom. A light-source module disposed on a fixed platform emits light to a lens module disposed on a movable platform. The light is reflected to one or more optoelectronic sensing module on the fixed platform via the lenses of the lens module. Then a processing unit calculates an alignment error or/and one or more straightness error or/and one or more angle error of the movable platform according to the signal generated by the optoelectronic sensing module.