Multispectral Active Remote Sensor Inverse Filtering
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Solution Overview
Problem
Traditional multispectral active remote sensing systems face a tradeoff between spatial and spectral information, with broader wavelength bands improving spatial resolution but reducing spectral resolution, and narrower bands improving spectral accuracy but reducing detection range and sensitivity.
Innovation Solution
The system uses broadband radiation and inverse narrowband filters to illuminate targets, allowing nearly all radiation energy to be used for range measurements by sequentially removing specific wavelength bands, rather than traditional direct filtering methods that limit energy to a fraction of the total.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If narrow band filtering is used to transmit only specific wavelength ranges, then spectral resolution is improved, but the energy level of radiation is reduced, decreasing signal to noise ratio and spatial resolution
Solution Approach 1:
The patent inverts the traditional filtering approach by using band stop filters instead of band pass filters. Rather than transmitting only narrow wavelength bands (which limits energy), the system transmits broadband radiation and stops specific narrow bands, thereby maintaining high energy levels while achieving spectral resolution through the stopped bands.
Solution Approach 2:
The patent changes the filtering parameter from transmitting narrow bands to stopping narrow bands within a broadband spectrum. This parameter change allows the system to maintain broadband energy transmission while still achieving spectral discrimination through the stopped bands, resolving the contradiction between energy preservation and spectral resolution.
2Loss of energy
If broadband radiation is transmitted to increase energy level and signal to noise ratio, then spatial resolution and detection range are improved, but spectral resolution is reduced
Solution Approach 1:
The patent applies inverse filtering by using band stop filters to remove specific narrow wavelength bands from the broadband spectrum. This allows the system to maintain the advantages of broadband transmission (high energy, good spatial resolution) while achieving spectral resolution through the selectively stopped bands, rather than using traditional band pass filtering.
Solution Approach 2:
The patent segments the broadband spectrum by introducing multiple可调 band stop filters that can selectively block different wavelength bands. This segmentation approach allows the system to maintain overall broadband energy transmission while creating distinct spectral measurement channels through the stopped bands, achieving both spatial and spectral resolution.
3Loss of information
If multiple receivers are used to detect multiple wavelengths in parallel, then spectral information is improved, but device complexity and cost increase
Solution Approach 1:
The patent makes a single receiver multi-functional by using可调 band stop filters that can sequentially block different wavelength bands. Instead of requiring multiple dedicated receivers for different wavelengths, one receiver can measure multiple spectral bands by sequentially adjusting which bands are stopped, thereby reducing device complexity while maintaining spectral information capability.
Solution Approach 2:
The patent introduces dynamic wavelength selection through可调 band stop filters that can change their blocked wavelength bands sequentially. This dynamic approach allows a single receiver to access multiple spectral bands over time, replacing the need for multiple static receivers and reducing system complexity while preserving spectral measurement capabilities.
4Device complexity
If sequential measurement with single receiver is used, then device complexity is reduced, but measurement time increases
Solution Approach 1:
The patent uses periodic sequential measurement with可调 band stop filters that cycle through different wavelength bands. By systematically adjusting which bands are stopped in each measurement cycle, the system efficiently collects spectral information across multiple bands using a single receiver, balancing measurement time with device simplicity through structured periodic sampling.
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 both spatial and spectral information, enabling detection at longer ranges with improved signal-to-noise ratio and material identification accuracy, while maintaining the simplicity and cost-effectiveness of broadband sources.
Implementation Method 1
a wavelength-adjustable narrow band stopper arranged on an radiation path from the radiation source to the detector, wherein the wavelength-adjustable narrow band stopper is configured to transmit the radiation beam in all the spectral range but a narrow band centered on a selected wavelength
Implementation Method 2
a detector configured to detect a time-of-flight and an radiation power of the reflected part of the radiation beam
Implementation Method 3
the transceiver being further configured for outputting a transmitted part of the radiation beam on a target, and further configured to receive a reflected part of the radiation beam from the target
Data Source
AI summary
Disclosed is a radiation arrangement for a multispectral active remote sensing device. The arrangement includes a transceiver, a detector, and a wavelength-adjustable narrow band stopper.