Reflective-Element Position Measurement for Robot Calibration
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Solution Overview
Problem
Existing technologies face challenges in accurately measuring the position of robot arms and machine tool spindles for precise processing and assembly, necessitating improved measurement devices for high-accuracy calibration.
Innovation Solution
A position measurement device that includes a position measurement unit and a reference position measurement unit, utilizing reflective elements to irradiate and receive light for accurate three-dimensional position information, with correction mechanisms to enhance precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single position measurement unit is used to measure the position of reflective elements, then the device complexity is reduced, but the measurement precision is insufficient for high-accuracy calibration
Solution Approach 1:
The measurement system is divided into multiple independent position measurement units, each equipped with its own light source and detector. This segmentation allows each unit to perform localized measurements with high precision while maintaining overall system modularity and manageable complexity
Solution Approach 2:
Reference reflective elements are introduced as intermediaries between the position measurement units and the target object. These reference elements provide stable reference points that enable precise position determination through relative measurements, improving measurement precision without requiring complex measurement geometries
2Measurement precision
If multiple position measurement units are used to improve measurement precision, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
Multiple position measurement units are merged into a single integrated measurement device that shares common components such as the controller and coordinate transformation system. This merging approach maintains high measurement precision through multiple measurement points while reducing overall device complexity by eliminating redundant components
Solution Approach 2:
The position measurement device is designed with universal functionality to measure positions of multiple reflective elements simultaneously or sequentially. The system can adapt to different measurement configurations and target objects, providing high precision across various applications without requiring separate specialized devices for each measurement task
3Measurement precision
If reference position measurement is performed to correct position information, then the measurement precision is improved, but the measurement time increases
Solution Approach 1:
Reference reflective elements are pre-positioned at known locations before measuring the target object. The position measurement units perform preliminary measurements of these reference elements to establish accurate reference frames. This preliminary action enables subsequent rapid and accurate measurements of the target object by reducing the complexity of absolute position determination
Solution Approach 2:
The system incorporates feedback mechanisms where the measured positions of reference reflective elements are used to correct and refine the measurement data. The controller processes the reference position information and applies corrections to the target object measurements in real-time or post-processing, improving precision without requiring separate calibration steps that would significantly increase measurement time
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-accuracy calibration of robot arms and machine tool spindles by correcting position information using reference reflective elements, ensuring precise processing and assembly.
Implementation Method 1
a position measurement unit configured to irradiate measurement light to a reflective element, receive reflected light reflected by the reflective element
Implementation Method 2
a reference position measurement unit configured to irradiate reference measurement light to at least one reference reflective element, receive reference reflected light reflected by the reference reflective element
Data Source
AI summary
A position measurement device includes a position measurement unit configured to irradiate measurement light to a reflective element, receive reflected light reflected by the reflective element, and acquire position information of the reflective element in a three-dimensional space and a reference position measurement unit configured to irradiate reference measurement light to at least one reference reflective element, receive reference reflected light reflected by the reference reflective element, and acquire position information of the reference reflective element in a three-dimensional space. The position information of the reflective element acquired by the position measurement unit is corrected using the position information of the reference reflective element measured by the reference position measurement unit.