Multi-layer Spectral Modulation for Compact Spectrometer Design
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Solution Overview
Problem
Conventional spectrometers require large wavelength dispersive devices for direct measurement and multiple spectral modulators for indirect measurement, making them bulky and costly, limiting their miniaturization and portability.
Innovation Solution
A multi-layer spectral modulation spectrometer with two spectral modulators optically coupled via a light guide, using liquid crystal spatial light modulators to selectively modulate light according to different spectral response patterns, allowing for reconstruction of the original light spectrum without the need for complex optics or multiple modulators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wavelength dispersive devices are used for direct measurement, then spectral measurement capability is achieved, but device size becomes large
Solution Approach 1:
The spectral modulation function is segmented across multiple layers (first spectral modulator layer and second spectral modulator layer), each performing partial spectral modulation. This allows the system to achieve complete spectral measurement capability without requiring a single large wavelength dispersive device, thereby reducing overall device volume while maintaining measurement precision.
Solution Approach 2:
The patent transitions from spatial separation of wavelengths (traditional dispersive approach) to spectral modulation in the frequency domain. By using multiple spectral modulators that apply different spectral response patterns, the system measures spectrum through temporal modulation sequences rather than spatial dispersion, enabling miniaturization while preserving spectral measurement capability.
2Measurement precision
If multiple spectral modulators are used for indirect measurement, then spectral measurement capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines spectral modulation and light regulation functions into integrated spectral modulator assemblies. Each assembly contains both spectral modulators and light regulators working together, reducing the total number of separate components needed while achieving the same spectral measurement capability, thereby simplifying device structure and reducing cost.
Solution Approach 2:
The spectral modulators are designed with multiple functions: they perform spectral modulation according to specific spectral response patterns, regulate light intensity through integrated light regulators, and can be selectively activated based on measurement requirements. This multi-functionality reduces the need for separate dedicated components for each function, simplifying the overall device architecture.
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
Enables miniaturization and cost-effective production of spectrometers suitable for portable devices, reducing component complexity while maintaining analytical performance.
Implementation Method 1
using liquid crystal spatial light modulators to selectively modulate light according to different spectral response patterns
Implementation Method 2
The photodetector is operable to measure an intensity of the second modulated light incident on the photodetector, and generate one or more signals corresponding to the intensity of the second modulated light
Data Source
AI summary
A system includes a first spectral modulator, a second spectral modulator, a light guide optically, a photodetector, and an electronic control device. The first spectral modulator receives sample light, and modulates the sample light according to a first spectral response pattern to produce first modulated light. The second spectral modulator receives the first modulated light from the first spectral modulator via the light guide, modulates the first modulated light according to a second spectral response pattern to produce second modulated light, and transmits the second modulated light to the photodetector. The photodetector measures an intensity of the second modulated light incident on the photodetector, and generates one or more signals corresponding to the intensity of the second modulated light. The electronic control device determines a spectral distribution of the sample light based on the one or more signals.