Telecentric Optical Test Apparatus Wavelength Separation
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Solution Overview
Problem
Current contactless optical test techniques face challenges in accurately measuring scattering characteristics and three-dimensional refractive index distributions, particularly in distinguishing between different wavelengths of light and determining scattering angles based on color separation.
Innovation Solution
An optical test apparatus comprising a first optical system with telecentricity for a specific wavelength and a second optical system without telecentricity for other wavelengths, using a shared lens and color filters with concentric wavelength selecting regions to image light rays and calculate scattering angles and three-dimensional positions based on color separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single optical system is used for imaging, then the device complexity is reduced, but the measurement precision for different wavelengths deteriorates
Solution Approach 1:
The optical system is segmented into two distinct optical paths: a first optical system with telecentricity for a specific wavelength and a second optical system without telecentricity for other wavelengths. This segmentation allows each optical system to be optimized for its designated wavelength, resolving the contradiction between device simplicity and wavelength-specific measurement precision.
Solution Approach 2:
Different optical qualities are applied locally to different wavelength ranges. The first optical system provides telecentric imaging for the first wavelength, while the second optical system provides non-telecentric imaging for the second wavelength. This local quality differentiation enables precise measurement for each wavelength without requiring a single complex system to handle all wavelengths equally.
2Measurement precision
If color filters with concentric wavelength selecting regions are used, then the scattering angle measurement precision is improved, but the device complexity increases
Solution Approach 1:
The wavelength selection is achieved by adding a spatial dimension through concentric circular patterns on the color filters. Instead of using complex spectral separation devices, the patent maps different wavelengths to different radial positions (dimensions) on the filter, allowing simple yet precise wavelength discrimination through the concentric structure.
Solution Approach 2:
The patent utilizes color filters with concentric wavelength selecting regions that transmit different wavelengths at different radial positions. By analyzing the color separation pattern in the captured image, the system can determine scattering angles with high precision without requiring complex additional optical components.
3Stability of the object's composition
If telecentric optical system is used for all wavelengths, then the measurement consistency is improved, but the adaptability to different wavelength characteristics deteriorates
Solution Approach 1:
The optical system is divided into wavelength-specific segments where each segment (first optical system for first wavelength, second optical system for second wavelength) can be independently optimized. This allows the first optical system to provide consistent telecentric measurements for its designated wavelength while the second optical system can be optimized for different characteristics suitable for its wavelength range.
Solution Approach 2:
The patent changes the optical parameters (telecentricity) based on the wavelength being measured. The first optical system maintains telecentricity for consistent measurements at the first wavelength, while the second optical system operates without telecentricity for the second wavelength, allowing each system to be optimized for its specific wavelength characteristics rather than forcing a single configuration on all wavelengths.
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 accurate measurement of scattering characteristics and three-dimensional surface shapes by effectively separating and analyzing light rays by color, improving measurement accuracy and precision in optical testing.
Implementation Method 1
The first optical system is configured to pass a light ray of a first wavelength and having telecentricity on an object side for the light ray of the first wavelength
Implementation Method 2
The second optical system is configured to pass a light ray of a second wavelength different from the first wavelength
Implementation Method 3
The image sensor is configured to image an object based on the light ray of the first wavelength having passed through the first optical system and the light ray of the second wavelength having passed through the second optical system
Data Source
AI summary
According to one embodiment, an optical test apparatus includes a first optical system, a second optical system, and an image sensor. The first optical system is configured to pass a light ray of a first wavelength and having telecentricity on an object side for the light ray of the first wavelength. The second optical system is configured to pass a light ray of a second wavelength different from the first wavelength. The image sensor is configured to image an object based on the light ray of the first wavelength having passed through the first optical system and the light ray of the second wavelength having passed through the second optical system.