Hyperspectral Imaging Modulation for Spatial Resolution
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Solution Overview
Problem
Current multi- or hyperspectral imaging technologies face limitations in spatial resolution, signal-to-noise ratio, and speed of information acquisition, with existing methods being unsuitable for real-time imaging or measurement, and lacking flexibility in hyperspectral analysis parameters.
Innovation Solution
A device and method for generating multispectral or hyperspectral illumination light with an addressable spectrum using a multispectral light source and a modulation device that temporally modulates individual spectral components with different modulation frequencies, sequences, and phases, allowing for simultaneous optical engagement of all spectral components with the object, improving spatial resolution and signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single camera image is used for spectral imaging, then the device complexity is reduced, but the photometric accuracy and signal-to-noise ratio deteriorate
Solution Approach 1:
The patent applies periodic modulation to individual spectral components using spatial light modulators, where each wavelength is modulated at a distinct frequency. This temporal encoding allows spectral information to be extracted from time-varying intensity measurements, achieving high photometric accuracy without requiring complex spatial spectral separation hardware.
Solution Approach 2:
The system uses dynamic spatial light modulators to temporally modulate spectral components, transforming a static spectral measurement problem into a dynamic temporal modulation problem. This allows the use of simpler detector hardware while maintaining high measurement precision through time-resolved detection.
2Measurement precision
If tunable light sources are used for spectral imaging, then the spectral resolution is improved, but the speed of information acquisition deteriorates
Solution Approach 1:
Instead of sequentially tuning a single wavelength at a time, the patent simultaneously illuminates all spectral components with a broadband source and uses periodic modulation at different frequencies to encode spectral information. This parallel approach with temporal encoding achieves both high spectral resolution and fast acquisition speeds suitable for real-time imaging.
Solution Approach 2:
The system pre-modulates all spectral components simultaneously using spatial light modulators before detection, allowing the detector to capture all spectral information in parallel. This eliminates the sequential tuning process and enables real-time spectral imaging with high resolution.
3Device complexity
If spectral components are sequentially measured, then the device complexity is reduced, but the signal-to-noise ratio deteriorates
Solution Approach 1:
The patent uses periodic modulation at distinct frequencies for each spectral component, allowing the detection system to simultaneously capture all wavelengths and later separate them through frequency analysis. This simultaneous measurement approach dramatically improves the signal-to-noise ratio compared to sequential measurement, while the modulation scheme keeps the optical hardware relatively simple.
Solution Approach 2:
By introducing temporal dynamics through frequency modulation, the system transforms a spatially complex spectral separation problem into a temporally resolved measurement problem. This allows simultaneous detection of all spectral components with a single detector, improving signal-to-noise ratio while maintaining device simplicity.
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 and signal-to-noise ratio, enabling faster and more flexible multi- or hyperspectral imaging, suitable for real-time applications and improving the reliability and speed of information acquisition.
Implementation Method 1
a modulation device (14) for temporal modulation of the individual spectral components with different modulation frequencies, sequences and phases
Implementation Method 2
a wavelength-dispersive means (12) for spatial separation of the individual spectral components from each other
Implementation Method 3
optical means (18) for spatial recombination of the modulated spectral components to at least approximate recombination, thereby forming multispectral electromagnetic radiation (24) with an addressed spectrum
Data Source
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AI summary
The invention relates to methods and to devices for generating multispectral illuminating light having an addressable spectrum, for adaptive multispectral imaging and for capturing structural and/or topographical information of an object or of the distance to an object. The illuminating device comprises a multispectral light source and a modulator for temporal modulation of the individual spectral components of the multispectral light source having modulation frequencies, modulation frequency ranges and/or modulation sequences which are different from one another in each case. The multispectral light source comprises (i) at least one light source (10) having a continuous, quasi-continuous, or frequency comb spectrum and wavelength-dispersive means (12) or (ii) an assembly or array of monochromatic or quasi-monochromatic light sources having emission wavelengths or emission wavelength bands which are different from one another in each case. The modulator comprises (i) at least one electrically controllable three-dimensional light modulator (14) or (ii) a plurality of electronic control modules assigned to the individual monochromatic or quasi- monochromatic light sources. The illuminating device further comprises optical means (18) for assembling the individual modulated spectral components, in order to form the multispectral illuminating light (24) having an addressable spectrum.