Spectroscopic Sensor Interference Filter Segmentation
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Solution Overview
Problem
Conventional spectroscopic sensors face issues with filter characteristic deterioration and noise light entry due to adverse effects on the optical filter unit's side face, which compromises the accuracy and reliability of light detection.
Innovation Solution
The spectroscopic sensor employs an interference filter unit with a ring-shaped second filter region surrounding the first filter region, featuring through holes for pad units and wires, which stabilizes the filter characteristics and restricts noise light entry by maintaining a controlled wavelength range and structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the optical filter unit is provided so as to correspond to a light-receiving surface of the light detection substrate and functions as a whole as a filter region, then the filter region can transmit light to be incident on the light-receiving surface, but filter characteristics may immediately deteriorate if a side face of the optical filter unit is adversely affected and noise light may easily enter from the side face
Solution Approach 1:
The optical filter unit is divided into a first filter region corresponding to the light-receiving surface and a ring-shaped second filter region surrounding the first filter region. This segmentation isolates the functional filtering area from the vulnerable side face area, allowing the first filter region to maintain stable characteristics while the second filter region provides protective coverage against noise light entry through the side faces.
Solution Approach 2:
The ring-shaped second filter region acts as an intermediary protective structure between the external environment (source of noise light) and the first filter region (functional area). This intermediate filter region blocks noise light from reaching the side faces and entering the optical path, while allowing the first filter region to perform its light transmission function undisturbed.
2Reliability
If the optical filter unit functions as a whole as a filter region, then light transmission to the light-receiving surface is achieved, but the side face is vulnerable to adverse effects causing filter characteristic deterioration
Solution Approach 1:
The optical filter unit is divided into a first filter region corresponding to the light-receiving surface and a ring-shaped second filter region surrounding the first filter region. This segmentation isolates the functional filtering area from the vulnerable side face area, allowing the first filter region to maintain stable characteristics while the second filter region provides protective coverage against noise light entry through the side faces.
Solution Approach 2:
Different regions of the optical filter unit are assigned different functions: the first filter region is optimized for light transmission to the light-receiving surface, while the ring-shaped second filter region is optimized for protecting the side faces. This local differentiation allows each region to be designed with appropriate properties for its specific role, improving overall reliability without compromising side face durability.
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 configuration effectively prevents filter characteristic deterioration and reduces noise light entry, enhancing the sensor's accuracy and reliability by protecting the first filter region and maintaining precise light detection.
Implementation Method 1
an interference filter unit, having a cavity layer and first and second mirror layers opposing each other through the cavity layer, for selectively transmitting therethrough a predetermined wavelength range of light according to an incident position thereof from the first mirror layer side to the second mirror layer side
Data Source
AI summary
A spectroscopic sensor 1A comprises an interference filter unit 20A having a cavity layer 21 and first and second mirror layers 22, 23 and a light detection substrate 30 having a light-receiving surface 32a for receiving light transmitted through the interference filter unit 20A. The interference filter unit 20A has a first filter region 24 corresponding to the light-receiving surface 32a and a ring-shaped second filter region 25 surrounding the first filter region 24. The light detection substrate 30 has a plurality of pad units 33a contained in the second filter region 25, while the second filter region 25 is formed with through holes 6 for exposing the pad units 33a to the outside.