Multi-Wavelength Optical Sensor Layout for Faster Detection
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Solution Overview
Problem
Existing optical sensors require a long time to acquire multiple types of information due to sequential irradiation with light of different wavelength bands.
Innovation Solution
An optical sensor design that includes a light receiving part with pixels, an interposer with through holes, and wavelength selecting units to transmit light in specific bands simultaneously, allowing for the acquisition of multiple types of information in a short time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If light of a plurality of wavelength bands is sequentially irradiated to the measuring object, then multiple types of information can be acquired, but the acquisition time becomes long
Solution Approach 1:
The light receiving part is divided into multiple pixel groups, where each pixel group is assigned to receive light of a specific wavelength band. The interposer is segmented into multiple through holes, with each through hole containing a wavelength selecting unit for a specific wavelength band. This spatial segmentation enables simultaneous reception of multiple wavelength bands, resolving the contradiction between information completeness and detection time.
Solution Approach 2:
The patent transitions from temporal multiplexing (sequential irradiation in time) to spatial multiplexing (simultaneous reception in space). By arranging multiple pixel groups and through holes in different spatial positions, each dedicated to specific wavelength bands, the system acquires multiple types of information simultaneously without time sequentialization, thus eliminating the time loss.
2Productivity
If multiple wavelength bands are received simultaneously through multiple through holes, then detection time is reduced, but device complexity increases
Solution Approach 1:
The interposer serves multiple functions: it provides mechanical support for the pixel array, creates optical pathways through through holes, and integrates wavelength selecting units. Each through hole with its wavelength selecting unit acts as an integrated optical channel that simultaneously performs wavelength filtering and light guiding, reducing the need for separate components and simplifying the overall device structure despite the multi-wavelength capability.
Solution Approach 2:
The wavelength selecting units are nested within the through holes of the interposer. Each wavelength selecting unit is positioned inside its corresponding through hole, creating a compact nested structure. This nesting approach allows multiple functional elements to be integrated in a space-efficient manner, reducing device complexity while enabling simultaneous multi-wavelength reception.
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 rapid acquisition of multiple types of information by overlapping through holes with different wavelength selecting units, reducing detection time and improving signal-to-noise ratio.
Implementation Method 1
a first wavelength selecting unit that transmits light in a first wavelength band and overlaps each of the plurality of through holes belonging to a first group
Implementation Method 2
a second wavelength selecting unit that transmits light in a second wavelength band and overlaps the plurality of through holes belonging to a second group, which is different from the first group
Implementation Method 3
a light receiving part that includes a plurality of pixels disposed in a plane surface and receives light from a measuring object
Data Source
AI summary
Provided is an optical sensor capable of obtaining a plurality of types of information by a plurality of wavelengths in a short time. The optical sensor includes a light receiving part that includes a plurality of pixels disposed in a plane surface and receives light from a measuring object, an interposer that includes a plurality of through holes and is disposed on an upper side of the light receiving part such that one or plurality of the through holes overlap each of the pixels, a first wavelength selecting unit that transmits light in a first wavelength band and overlaps each of the plurality of through holes belonging to a first group, and a second wavelength selecting unit that transmits light in a second wavelength band and overlaps the plurality of through holes belonging to a second group, which is different from the first group.