Cylindrical Lens Optical System for Hyperspectral Spatial Resolution
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Solution Overview
Problem
DMD-based hyperspectral imaging systems have limited spatial resolution due to the rectangular shape of the digital micromirror device, which restricts the magnification of images in the longitudinal direction, thereby limiting the spatial resolution of hyperspectral imaging.
Innovation Solution
The use of a cylindrical lens to change the aspect ratio of the image focused on the DMD, with a first cylindrical lens focusing and forming an image on the shorter side and a second cylindrical lens collimating light reflected from the DMD, along with programming the DMD to reflect only active micromirrors, allows for increased spatial resolution by maximizing the active area utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a rectangular DMD is used for hyperspectral imaging, then the device structure is simple and easy to manufacture, but the spatial resolution in the longitudinal direction is limited due to restricted image magnification
Solution Approach 1:
The optical system is segmented into distinct functional modules: a first cylindrical lens for focusing, a second cylindrical lens for collimating, and a rectangular DMD. This segmentation allows each component to be optimized independently, resolving the contradiction by enabling high spatial resolution through the lens combination while maintaining the simplicity of the rectangular DMD structure.
Solution Approach 2:
The first and second cylindrical lenses act as intermediary elements between the light source and the rectangular DMD. These lenses modify the light path to achieve enhanced image magnification in the longitudinal direction, thereby improving spatial resolution without requiring a change in DMD geometry or direct complex optical coupling.
2Measurement precision
If the image magnification in the longitudinal direction is increased to improve spatial resolution, then the spatial resolution improves, but the DMD cannot accommodate the magnified image due to its rectangular shape
Solution Approach 1:
The first cylindrical lens focuses light in the longitudinal direction (one dimension), while the second cylindrical lens collimates the reflected light. This dimensional approach to light manipulation enables magnification specifically in the longitudinal direction without requiring the DMD to change its rectangular geometry, thus improving spatial resolution while maintaining area utilization.
Solution Approach 2:
The optical system changes the parameters of light propagation through the cylindrical lenses, specifically the focal length and collimation angle, to achieve enhanced magnification in the longitudinal direction. This parameter adjustment allows the magnified image to be accommodated within the fixed rectangular active area of the DMD, resolving the contradiction between magnification and area utilization.
3Measurement precision
If only active micromirrors are used for reflection to improve spatial resolution, then the spatial resolution and data quality improve, but the scanning time and data acquisition complexity increase
Solution Approach 1:
The system extracts and utilizes only the active micromirrors from the DMD array for light reflection, excluding inactive micromirrors. This extraction approach improves spatial resolution by reducing optical interference and improving signal quality, while the systematic scanning method manages the time penalty through efficient data acquisition.
Solution Approach 2:
The DMD scans through different line patterns in a periodic manner, systematically activating different sets of micromirrors in sequential lines. This periodic scanning approach organizes the data acquisition process to minimize redundant operations and optimize the balance between spatial resolution and scanning time.
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 the spatial resolution of hyperspectral imaging by increasing the magnification of the image on the DMD, allowing for more detailed spatial information to be obtained, thereby improving the quality of the 3D hyperspectral data cube.
Implementation Method 1
a first cylindrical lens curved to focus and form an image on an axis corresponding to a shorter side of the DMD
Implementation Method 2
a second cylindrical lens curved in the same axial direction as the axis to collimate light reflected from the DMD
Implementation Method 3
a spectroscope configured to disperse light collimated by the second cylindrical lens into a spectrum according to a wavelength when the light is incident thereon
Data Source
AI summary
Provided are an optical system capable of improving the spatial resolution of hyperspectral imaging and an optical alignment method using the same. The optical system includes a digital micromirror device (DMD) having a rectangular shape, a first cylindrical lens curved to focus and form an image on an axis corresponding to a shorter side of the DMD, and a second cylindrical lens curved in the same axial direction as the axis to collimate light reflected from the DMD.