Measurement Scanner Calibration Using a Reference Test Body
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Solution Overview
Problem
The calibration of measurement scanners on laser-working optical units in laser working devices becomes inaccurate due to component replacements and collisions during workpiece processing, leading to quality losses in laser processing.
Innovation Solution
A method for calibrating the measurement scanner involves creating a measurement scan of a test body using a measurement beam, comparing the scan data with reference data, and correcting the measurement scanner to match the reference data, ensuring high accuracy and adaptability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex sensors are used to measure the measurement beam in different positions, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent uses a test body with a known geometric structure (such as a chessboard pattern or circular features) as a reference copy to compare against the measurement scanner's output. This allows calibration without requiring complex reference sensors, as the test body provides a simple, reproducible geometric standard that can be scanned and compared to determine calibration accuracy.
2Measurement precision
If factory calibration is performed once before commissioning, then initial measurement precision is achieved, but reliability deteriorates over time due to component replacements and collisions
Solution Approach 1:
The patent incorporates a test body into the laser working device that can be used for calibration at any time during operation. This preliminary preparation of calibration means allows the system to perform self-calibration after component replacements or collisions, maintaining reliability without requiring external calibration equipment or complex procedures.
Solution Approach 2:
The measurement scanner can perform self-calibration using the integrated test body within the laser working device. The system automatically compares measurement scan data with reference data and adjusts calibration parameters without external intervention, enabling the device to maintain its own measurement accuracy after disturbances such as component replacements or collisions.
3Ease of manufacture
If the known method of shooting a pattern into sheet metal is used, then calibration can be performed, but measurement precision is reduced and results depend on material properties
Solution Approach 1:
The patent replaces the sheet metal target with a test body having precisely defined geometric features (such as circular markings or chessboard patterns) that serve as an idealized reference copy. These features provide exact geometric standards independent of material properties, allowing accurate measurement of the measurement scanner's performance without the distortions introduced by material absorption, reflection, or deformation characteristics.
Data Source
AI summary
A method for calibrating a measurement scanner on a laser-working optical unit of a laser working device includes creating a measurement scan of a test body using a measurement beam, and comparing measurement scan data the measurement scan with reference data of the test body, and if the measurement scan data of the measurement scan deviate from the reference data, correcting the measurement scanner so that the measurement scan data and the reference data of the test body match.