Wavelength Spectroscopy Device With Integrated Interference Filter Cell
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Solution Overview
Problem
Conventional spectrometric devices face challenges in miniaturization, cost-effectiveness, and reproducibility due to complex optical alignment, high production costs, and limited miniaturization possibilities, especially when dealing with multiple filters and detectors for wavelength analysis.
Innovation Solution
A wavelength spectroscopy device featuring a filter cell with multiple interference filters and a single detector, where each emission source is associated with an interference filter, allowing for efficient use of multiple sources over detectors and optimized alignment for improved miniaturization and cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple detectors are used to analyze multiple wavelength bands, then measurement precision is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent combines multiple detectors into a single detector by using a filter cell that simultaneously directs different wavelength bands to different regions of the same detector. The filter cell acts as a wavelength-dependent beam splitter, enabling one detector to perform the function of multiple detectors while maintaining measurement precision across multiple wavelength bands.
Solution Approach 2:
The single detector is designed to handle multiple wavelength bands through the filter cell's wavelength-selective routing. Each region of the detector responds to specific wavelength ranges, making the single detector universal for detecting multiple wavelength bands that would traditionally require separate detectors.
2Manufacturing precision
If multiple interference filters are manufactured separately, then filtering precision is improved, but manufacturing cost and time increase proportionally with the number of filters
Solution Approach 1:
The patent merges multiple separate filter manufacturing processes into a single integrated filter cell structure. Multiple interference filters are deposited simultaneously on the same substrate using sequential vacuum deposition, eliminating the need for separate manufacturing processes for each filter and significantly reducing production costs while maintaining precise wavelength control.
Solution Approach 2:
The filter cell is designed with pre-defined wavelength regions during the deposition process. The sequential deposition method allows each filter layer to be deposited in advance with precise thickness control, ensuring that the final assembled device has the required wavelength precision without requiring post-manufacturing adjustments.
3Measurement precision
If a grating spectrometer is used to achieve high resolution, then measurement precision is improved, but device size increases and miniaturization becomes difficult
Solution Approach 1:
The patent replaces the mechanical grating-based dispersion system with an integrated filter cell that uses thin-film interference filters. This substitution eliminates the need for large mechanical gratings and complex optical paths, enabling miniaturization while maintaining spectral resolution through the wavelength-selective properties of the deposited filter layers.
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
The solution enables stable, reproducible, and cost-effective wavelength analysis by simplifying the optical setup and reducing the need for multiple detectors, while allowing for precise wavelength detection across a range of wavelengths.
Implementation Method 1
a filter cell consisting of two mirrors separated by a spacer membrane, this filtering cell being formed by a plurality of interference filters
Implementation Method 2
an emission cell comprising a plurality of emission sources, each of these sources being associated with one of the interference filters
Implementation Method 3
spectrometric analysis, which aims in particular to identify chemical constituents in the composition of a solid, liquid, or gaseous medium using a light source. It involves recording the absorption spectrum of this medium
Data Source
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AI summary
The invention relates to a wavelength spectroscopy device comprising, on a substrate, a filtering cell CF consisting of two mirrors separated by a spacing membrane, this filtering cell being formed by a plurality of interference filters. In addition, this device includes an emission cell CE having a plurality of emission sources, each of these sources being associated with one of the interference filters.