Virtual Calibration Plate for PIV Measurement Arrangement
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Solution Overview
Problem
The existing methods for calibrating Particle Image Velocimetry (PIV) measuring arrangements require a calibration plate, which increases the setup costs and complexity, and there is a need for a more efficient method that eliminates the need for a physical calibration plate.
Innovation Solution
A method that uses a computer system to create a three-dimensional computer model of the PIV measurement arrangement with a virtual calibration plate, generating artificial images using ray tracing to simulate the calibration process, thereby eliminating the need for a physical calibration plate and reducing the overall effort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a calibration plate is used for calibrating the PIV measuring arrangement, then the calibration accuracy is ensured, but the setup costs and complexity increase
Solution Approach 1:
The patent creates a virtual copy of the calibration plate within a three-dimensional computer model of the measurement arrangement. This virtual calibration plate serves the same calibration function as a physical plate but eliminates the need for manufacturing, positioning, and handling actual hardware, thereby reducing setup complexity while maintaining calibration accuracy through precise digital modeling and ray-tracing-based image generation.
2Measurement precision
If a calibration plate is used for calibrating the PIV measuring arrangement, then the calibration process can be performed, but the effort and time required increase
Solution Approach 1:
The patent performs preliminary calibration by generating artificial calibration images from a three-dimensional computer model before actual measurements begin. The virtual calibration plate and its images are pre-computed using ray-tracing methods, allowing the calibration data to be ready in advance. This eliminates the time-consuming steps of physically setting up and adjusting a real calibration plate during the measurement process.
Solution Approach 2:
The patent replaces the mechanical calibration process involving physical plates, cameras, and manual adjustments with a computational approach. Three-dimensional computer modeling and ray-tracing algorithms generate calibration images digitally, substituting mechanical operations with automated computer-based calculations that are faster and more consistent.
3Measurement precision
If a physical calibration plate is used, then calibration images can be captured, but additional hardware and setup requirements are introduced
Solution Approach 1:
The patent creates a virtual representation of the calibration plate within a three-dimensional computer model, eliminating the need to manufacture and physically handle a real calibration plate. The virtual plate is positioned and oriented digitally within the simulated measurement scene, and calibration images are generated through ray-tracing calculations that simulate camera captures, providing all necessary calibration data without physical hardware.
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
This approach allows for a low-cost and efficient calibration process with minimal error, using the artificially generated images for rough and further calibration steps, while maintaining the accuracy of the conventional calibration method.
Implementation Method 1
the images from the cameras are artificially generated on the basis of the computer model, in particular using a ray tracing method
Data Source
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AI summary
The invention relates to a method for calibrating a PIV measurement arrangement, the measurement arrangement comprising at least two cameras (1), and the method comprising three steps (V1, V2, V3), wherein: in the first step (V1), the measurement arrangement is provided; in the second step (V2), a computer system (4) is provided and the computer system (4) is used to create a three-dimensional computer model (5) of the measurement arrangement, the computer model (5) comprising a virtual calibration board (6) which is arranged inside the computer model (5) such that it is situated within the field of view of the cameras (1); and in the third step (V3), the images (3) of the cameras (1) are generated artificially on the basis of the computer model (5) with the application of a ray-tracing method.