Single-Pixel Optical Apparatus for Multi-Wavelength Inspection
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Solution Overview
Problem
Current optical inspection methods using single-pixel imaging require extended time for projecting multiple illumination light beams onto an object, limiting the efficiency of data acquisition.
Innovation Solution
An optical apparatus that simultaneously illuminates an object with multiple pattern rays of different wavelengths, utilizing a single pixel light-receiving unit to disperse and receive these rays, allowing for the acquisition of detailed information about the object's surface by correlating signal intensities and intensity distributions across various wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple illumination light beams are projected onto an object sequentially using single-pixel imaging, then detailed information on the object can be obtained, but the inspection time is extended
Solution Approach 1:
The illumination light is segmented into multiple wavelengths, with each wavelength carrying specific pattern information. By projecting multiple wavelengths simultaneously rather than sequentially, the system obtains detailed object information across different spectral bands while eliminating the time penalty of sequential projection.
Solution Approach 2:
The system uses periodic modulation of multiple wavelength components simultaneously, where each wavelength is modulated at a distinct frequency. This allows the single-pixel detector to distinguish and process multiple wavelength signals in parallel through frequency domain separation, achieving detailed information acquisition without time extension.
2Productivity
If multiple pattern rays with different wavelengths are projected simultaneously, then the projection time is shortened, but the device complexity increases due to the need for multi-wavelength control and signal separation
Solution Approach 1:
A single illumination source is designed to generate multiple wavelengths simultaneously, and a single-pixel detector is equipped with spectral separation capability. This multi-functional design allows one device to perform what would traditionally require multiple separate devices, achieving fast multi-wavelength projection without proportionally increasing system complexity.
Solution Approach 2:
The system introduces an intermediary spectral separation mechanism between the object and the single-pixel detector. This intermediary component separates the mixed wavelength signals in the spectral domain, allowing the simple single-pixel detector to process complex multi-wavelength information without requiring complex per-pixel spectral analysis circuitry.
3Device complexity
If a single pixel light-receiving unit is used to receive multiple wavelengths, then the device structure is simplified, but the ability to distinguish and process different wavelengths simultaneously is reduced
Solution Approach 1:
The system transitions from spatial dimension analysis to spectral dimension analysis. Instead of using multiple pixels to detect different wavelengths spatially, the single-pixel detector analyzes wavelengths in the spectral dimension through frequency domain separation. This dimensional transformation maintains structural simplicity while enabling precise wavelength discrimination.
Solution Approach 2:
The system changes the detection parameter from spatial position (which would require multiple pixels) to spectral frequency (which can be processed by a single pixel with appropriate signal processing). By measuring the frequency characteristics of the modulated light signals, the single-pixel detector achieves wavelength discrimination capability equivalent to multi-pixel systems.
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 significantly reduces the time required for projecting multiple illumination rays while enhancing the accuracy of surface information acquisition, enabling faster and more precise image formation of the object.
Implementation Method 1
a pixel that can receive the rays from the object to disperse at least two of the different wavelengths included in the pattern rays
Data Source
AI summary
According to an embodiment, an optical apparatus includes an illumination unit, a light-receiving unit and a processing unit. The illumination unit can illuminate an object with a plurality of pattern rays including rays with different wavelengths simultaneously. The light-receiving unit includes a pixel that can receive the rays from the object to disperse at least two of the different wavelengths included in the pattern rays. The processing unit acquires information on the object based on a result of the pixel of the light-receiving unit receiving the pattern rays with which the illumination unit illuminates the object simultaneously.