Thin-Layer Spectroscopy for Compressive Sensing Without Spatial Modulation
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Solution Overview
Problem
Traditional spectroscopy methods are time-consuming and resource-intensive due to the need for numerous measurements, and compressive sensing techniques based on spatial modulation suffer from power losses and complexity.
Innovation Solution
The use of thin-layered photonic devices to modulate spectral signals with multiple peaks, allowing for numerical reconstruction of spectral distributions with a higher number of spectral bands than measurements, utilizing tunable devices such as liquid-crystal-retarders and partially-reflective layers to achieve CS-compliant modulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional spectroscopy methods are used to obtain spectral information at narrow spectral bands, then measurement precision is improved, but measurement time and resource consumption increase
Solution Approach 1:
The spectrum is segmented into multiple narrow spectral bands using diffractive, dispersive, or narrow-band filter techniques. Each band is measured separately with a detector, allowing precise spectral information to be obtained while reducing the total measurement time by parallelizing the measurement process across multiple bands rather than scanning sequentially
Solution Approach 2:
The patent transitions from temporal scanning (measuring one band at a time over time) to spatial multiplexing (measuring multiple bands simultaneously across different spatial locations). By using dispersive elements to spatially separate spectral bands and detectors arranged in space to capture them simultaneously, the system achieves both high precision and fast acquisition by eliminating the time dimension from sequential measurement
2Productivity
If compressive sensing techniques based on spatial modulation are used to reduce measurements, then productivity is improved, but device complexity and power loss increase
Solution Approach 1:
The patent extracts and removes the complex spatial modulation components from the compressive sensing system. Instead of using spatial light modulators and complex modulation patterns, the system uses direct spectral multiplexing with simple dispersive elements and fixed detectors, taking out the problematic spatial modulation part while retaining the core compressive sensing capability of recovering spectral information from fewer measurements
Solution Approach 2:
The patent replaces complex mechanical or electro-optical spatial modulation mechanisms with a simpler optical dispersion-based system. Instead of actively modulating light in space using complex devices, the system uses passive dispersive elements to spatially separate wavelengths, substituting complex active modulation with simpler passive optical separation, thereby reducing device complexity while maintaining productivity gains
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 reduces the number of measurements required, decreases system complexity and power loss, and enhances spectral resolution, leading to more efficient and cost-effective spectroscopic data acquisition.
Implementation Method 1
using one or more thin-layered photonic devices to modulate a plurality of spectral modulations from a spectral signal
Implementation Method 2
a tunable reflection-based thin-layered photonic device having a plurality of partially-reflective layer having a reflectivity ranging between about 70%-95%
Implementation Method 3
each spectral modulation characterized by at least two peaks when depicted in a modulated transmission or reflection response
Implementation Method 4
the one or more thin-layered photonic devices includes a tunable single-cell liquid-crystal-retarder
Implementation Method 5
the one or more thin-layered photonic devices includes a tunable single-cell liquid-crystal-retarder; adjusting a voltage applied to the liquid-crystal-retarder
Implementation Method 6
a tunable reflection-based thin-layered photonic device having a plurality of partially-reflective layer having a reflectivity ranging between about 70%-95%
Implementation Method 7
adjusting a distance between the partially-reflective layers; the adjusting a distance between the partially-reflective layers is implemented in increments of 0.1 μm
Data Source
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AI summary
A spectroscopic method using either tunable or preset non-tunable thin-layered devices or a combination of both to modulate compressed-sensing-compliant, spectral modulations and to use intensity measurements of each respective spectral modulation to numerically reconstruct an estimated spectral distribution of the spectral signal such that the estimated spectral distribution is characterized by a totality of spectral bands exceeding the number of spectral modulations by about one half an order-of-magnitude or more.