Macro-Micro Composite Grating Ruler for High-Speed Precision Measurement
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Solution Overview
Problem
Existing grating ruler systems face a dilemma between high speed and high precision, as increasing data density for precision measurement leads to increased costs and risks of 'losing steps' during high-speed motion, and current methods require multiple rulers, making them less applicable and costly.
Innovation Solution
A macro-micro composite grating ruler system with a macro-scale and micro-scale reading module, using a grating strip band and image processing to measure displacement, where the macro-scale module handles high-speed motion and the micro-scale module provides high-precision measurements, with image overlap and angle-based calculations to enhance precision and speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the density of the graduation of the optical grating is increased to enhance precision of displacement measurement, then measurement precision is improved, but the speed of measurement is limited
Solution Approach 1:
The reading system is divided into two independent modules: a macro-scale reading module for high-speed measurement and a micro-scale reading module for high-precision measurement. Each module processes different aspects of the measurement task, allowing the system to achieve both high speed and high precision simultaneously without the trade-off present in conventional single-module systems.
2Measurement precision
If the grating is made dense to improve precision for displacement measurement, then measurement precision is improved, but the risk of losing steps during data acquisition increases
Solution Approach 1:
The reading system is divided into two independent modules: a macro-scale reading module for high-speed measurement and a micro-scale reading module for high-precision measurement. Each module processes different aspects of the measurement task, allowing the system to achieve both high speed and high precision simultaneously without the trade-off present in conventional single-module systems.
3Measurement precision
If two grating rulers are used to achieve high-speed and high-precision displacement measurement, then measurement capability is improved, but device complexity and cost increase
Solution Approach 1:
Instead of using two separate grating rulers as in conventional systems, this invention merges the functionality of high-speed and high-precision measurement into a single grating ruler with a unified reading system that contains both macro-scale and micro-scale reading modules. This integration reduces system complexity and cost while maintaining the capability for both high-speed and high-precision measurement.
Solution Approach 2:
The single grating ruler is designed to serve multiple functions: it works with both the macro-scale reading module for high-speed measurement and the micro-scale reading module for high-precision measurement. The reading system is multi-functional, capable of switching between or combining both measurement modes depending on the application requirements.
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 high-speed and high-precision displacement measurement with reduced costs by using a single system, capable of processing multiple grating strips to improve precision and handle manufacturing errors, while maintaining compatibility with existing incremental and absolute grating rulers.
Implementation Method 1
a macro-micro reading system including a macro-scale reading module and a micro-scale reading module... the micro-scale reading module including an image sensor and a lens... the system further including a measuring reference line, the measuring reference line being a straight line or a set of straight lines that are parallel to each other, the measuring reference line together with the grating strips captured by the image sensor forming an image overlap in the counting and image processing module
Implementation Method 2
The basic principle on which a grating ruler works is that the relative movement between the ruler and its scanning mask forms a Moire pattern under light
Data Source
AI summary
The present disclosure relates to a macro-micro composite grating ruler measuring system based on conversion and amplification in vertical and horizontal directions. The macro-micro composite grating ruler includes a grating ruler, a macro-micro reading system moving with respect to the grating ruler, and a counting and image processing module. The macro-micro reading system faces grating strip datum and is parallel to the grating ruler. The system further includes a measuring reference line. The measuring reference line obtained by the image sensor together with grating strips forms an image overlap in the counting and image processing module. The measuring reference line and the grating strip jointly include an angle θ. With the foregoing configuration, the present invention is compatible with the existing incremental grating rulers and absolute grating rulers, so is highly applicable.