3D Position Measurement Using Reference Reflective Correction
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Solution Overview
Problem
Existing position measurement devices for robots and machine tools lack the accuracy needed for precise processing and assembly, necessitating improved methods for high-precision position measurement of robotic arms and machine tool spindles.
Innovation Solution
A position measurement device that uses a combination of measurement and reference measurement units to irradiate and receive light from reflective elements, correcting position information using reference reflective elements, and includes components like optical frequency comb interferometers and cameras for precise distance and direction measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single position measurement unit is used to measure the position of robotic arms and machine tool spindles, then the device complexity is reduced, but the measurement precision is insufficient for high-accuracy processing and assembly
Solution Approach 1:
The position measurement device is divided into multiple independent measurement units, each responsible for measuring specific positions. The system includes a first position measurement unit for measuring the position of a robot and a second position measurement unit for measuring the position of a machine tool spindle. Each unit independently irradiates measurement light to reflective elements and processes the reflected light to obtain position information, thereby achieving high measurement precision without requiring a single overly complex measurement system.
2Measurement precision
If reference reflective elements are introduced to correct position information, then the measurement precision is improved, but the device complexity increases due to additional reference measurement units
Solution Approach 1:
Reference reflective elements are introduced as intermediary components to correct position information. The system includes reference reflective elements positioned at known locations that reflect reference measurement light. By measuring the positions of these reference elements, the system can calculate correction values for the position information obtained from the main measurement units, thereby improving accuracy without requiring complex correction algorithms or additional processing units.
3Productivity
If multiple measurement units irradiate measurement light to reflective elements simultaneously, then the productivity is improved through parallel measurement, but the loss of time may increase due to coordinate system alignment and correction processes
Solution Approach 1:
The system performs preliminary actions by pre-positioning reference reflective elements at known locations and pre-calculating the coordinate transformation parameters. The reference measurement units continuously measure the positions of reference elements, and the control unit pre-processes this information to maintain accurate coordinate system alignment. This allows the main measurement units to operate in parallel without significant time loss for coordinate transformation, as the alignment information is already prepared and updated in advance.
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 position measurement of robotic arms and machine tool spindles, enhancing the precision of processing and assembly tasks by correcting position information based on reference reflective elements.
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
Implementation Method 3
the position measurement unit includes a distance measurement unit configured to irradiate the measurement light to the reflective element, receive the reflected light, and measure a distance to the 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.