Optical Measuring System Spectral Bandwidth Restriction
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Solution Overview
Problem
Optical measuring systems with inhomogeneous light sources face challenges in reliably detecting measuring points due to varying radiant power across different wavelengths, leading to inconsistent measurement quality, especially in areas with low radiant power.
Innovation Solution
The method involves restricting the spectral bandwidth of the optical measuring system to a reduced measurement range, which is set based on component-specific parameters, using filters or adjusting the light source and detector to ensure sufficient radiant power for accurate measurements, thereby focusing on wavelength ranges with higher intensity for reliable detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the full available measuring range of the optical measuring system is used, then the measurement coverage is maximized, but measurement reliability deteriorates in regions with low radiant power
Solution Approach 1:
The available measuring range is segmented into multiple wavelength regions based on radiant power characteristics. The patent divides the spectrum into a first wavelength region with higher radiant power and a second wavelength region with lower radiant power, allowing selective use of appropriate wavelength ranges for different measurement requirements to ensure reliability.
Solution Approach 2:
Instead of using the full available measuring range, the patent applies partial action by selectively utilizing only the wavelength regions with sufficient radiant power for reliable detection. This means using a reduced but adequate measuring range that ensures measurement quality rather than maximizing coverage at the cost of reliability.
2Use of energy by stationary object
If wavelengths with low radiant power are used for measurement, then the measuring range is extended, but detection accuracy deteriorates
Solution Approach 1:
The patent changes the spectral parameter by selecting specific wavelength ranges with appropriate radiant power characteristics. It adjusts the effective measuring range by excluding wavelength regions with insufficient radiant power, thereby maintaining detection accuracy while still providing adequate measurement coverage.
3Adaptability or versatility
If the spectral bandwidth is not restricted, then the available measuring range is maximized, but measurement consistency deteriorates due to inhomogeneous radiant power distribution
Solution Approach 1:
The patent applies local quality by treating different wavelength regions with different quality requirements. It identifies that certain wavelength regions have inherently lower radiant power and applies selective measurement strategies or corrections for these specific regions, rather than applying a uniform approach across the entire spectrum, thereby improving overall measurement consistency.
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 enhances measurement reliability by ensuring that only wavelengths with sufficient radiant power are used, improving the detection of geometric features on components, particularly in areas with low radiant power, resulting in more consistent and accurate measurement results.
Implementation Method 1
This utilizes the mechanism of dispersion, i.e., the wavelength-dependent propagation speed of light. This mechanism generates the longitudinal chromatic aberrations of a lens, which cause the light to be focused at different depths (distances) in front of the lens depending on its wavelength.
Implementation Method 2
This mechanism generates the longitudinal chromatic aberrations of a lens, which cause the light to be focused at different depths (distances) in front of the lens depending on its wavelength.
Implementation Method 3
By using a spectrometer, light waves returning to the component being measured, either through reflection or scattering, can be assigned to their depth.
Implementation Method 4
By using a spectrometer, light waves returning to the component being measured, either through reflection or scattering, can be assigned to their depth.
Data Source
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Figure 3
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AI summary
Method comprising the following steps: - Providing a component (14) at a coordinate measuring machine (10), wherein the coordinate measuring machine (10) has an optical measuring system (16) and wherein an available measuring range (20) of the optical measuring system (16) is defined by an inhomogeneous spectrum (22) of a light source (24) of the optical measuring system (16); - Measuring a geometric feature of the component (14) to be measured, wherein a reduced measuring range (34) is used which is smaller than the available measuring range.