Spectroscopic Sensor Cavity Layer Peeling Prevention
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Solution Overview
Problem
Spectroscopic sensors with interference filter units face reliability issues due to the delicate cavity layer peeling off from mirror layers under temperature cycles, leading to potential deterioration or breakage.
Innovation Solution
The spectroscopic sensor design features an integrally formed cavity layer over interference filter units, with parts of the cavity layer entering between adjacent mirror layers, preventing peeling and enhancing bonding and mechanical strength through separate second mirror layers and an optical resin layer for substrate joining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the cavity layer is made thin (several hundreds of nm or less) to achieve precise spectral filtering, then the spectral selectivity is improved, but the cavity layer becomes delicate and prone to peeling off from mirror layers under temperature cycles
Solution Approach 1:
The cavity layer is formed integrally over multiple interference filter units as a single continuous layer rather than as separate layers for each filter unit. This merging approach allows the cavity layer to span across mirror layers, creating mechanical interlocking that prevents peeling while maintaining the thin thickness needed for spectral selectivity
Solution Approach 2:
The cavity layer extends into the region between adjacent second mirror layers, adding a lateral dimensional component to the structure. This lateral extension creates anchoring effects that prevent peeling without requiring the cavity layer to be thicker, thus maintaining spectral precision while improving bonding stability
2Ease of manufacture
If the interference filter units are separated into individual units with their own cavity layers, then the manufacturing flexibility is improved, but the bonding strength and mechanical strength of the overall structure deteriorates
Solution Approach 1:
The cavity layer is formed as a single integral structure that covers multiple interference filter units, merging what would otherwise be separate cavity layers. This provides continuous bonding support across the entire array of filter units, significantly improving the overall mechanical strength and bonding strength while still allowing individual filter units to be defined by their separate mirror 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
This design provides a highly reliable spectroscopic sensor by preventing cavity layer peeling and improving bonding and mechanical strength, ensuring stability under temperature cycles.
Implementation Method 1
a plurality of interference filter units, having a cavity layer and first and second mirror layers opposing each other through the cavity layer, for selectively transmitting therethrough light in a predetermined wavelength range according to an incident position thereof
Data Source
AI summary
A spectroscopic sensor 1 comprises a plurality of interference filter units 20A, 20B, 20C, having a cavity layer 21 and first and second mirror layers 22, 23 opposing each other through the layer 21, for selectively transmitting therethrough light in a predetermined wavelength range according to an incident position thereof; a light-transmitting substrate 3, arranged on the first mirror layer 22 side, for transmitting therethrough the light incident on the units 20A, 20B, 20C; and a light detection substrate 4, arranged on the second mirror layer 23 side, for detecting the light transmitted through the units 20A, 20B, 20C. The second mirror layers 23 are separated for the respective units 20A, 20B, 20C. The cavity layer 21 is formed integrally over the units 20A, 20B, 20C, while a part of the layer 21 enters a region between the second mirror layers 23, 23 adjacent to each other.