Stacked Optoelectronic Sensor Layout for Frequency-Shifted Detection
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Solution Overview
Problem
Existing optoelectronic sensor arrangements face challenges in achieving a compact form factor due to the spatial separation of illuminating means and photodetectors, which complicates coupling with fiber-optic elements and limits their ability to detect frequency-shifted backscattered radiation effectively.
Innovation Solution
A stacked arrangement of illuminating means and photodetectors on a carrier substrate with a frequency-selective optical element between them, where the photodetector is positioned behind the illuminating means, and a fiber-optic element is used to couple and filter frequency-shifted radiation, enhancing light coupling and signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the illuminating means and photodetector are arranged in spatially separated substrate cavities or use filter components, then the photodetector can detect backscattered radiation, but the transverse dimensions of the optoelectronic sensor arrangement become large, making coupling with fiber-optic elements difficult
Solution Approach 1:
The patent transitions from a planar arrangement to a three-dimensional stacked configuration where the illuminating means and photodetector are vertically positioned one above the other on the carrier substrate. This vertical stacking in the third dimension enables compact transverse dimensions while maintaining the necessary optical path length and detection capability through the frequency-selective optical element positioned between them
Solution Approach 2:
The patent combines multiple functional components (illuminating means, frequency-selective optical element, and photodetector) into a single integrated stacked arrangement on one carrier substrate. This merging of previously separated components into a unified compact structure achieves both space efficiency and functional integration for effective backscattered radiation detection
2Area of stationary object
If the photodetector is positioned adjacent to the illuminating means, then the device size is reduced, but direct irradiation from the illuminating means to the photodetector creates interference and reduces signal-to-noise ratio
Solution Approach 1:
The patent introduces a frequency-selective optical element as an intermediary component positioned between the illuminating means and the photodetector in the stacked arrangement. This intermediary selectively transmits only frequency-shifted backscattered radiation while blocking direct irradiation from the illuminating means, thereby maintaining compact dimensions while ensuring high signal-to-noise ratio for detection
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 allows for a compact, efficient detection of frequency-shifted backscattered radiation, improving the signal-to-noise ratio and enabling the use of optoelectronic sensors in small-scale devices, such as wearable or embedded systems.
Implementation Method 1
a frequency-selective optical element is arranged between the illuminating means and the photodetector... the frequency-selective optical element is configured to shield the photodetector from the electromagnetic radiation emitted by the illuminating means
Implementation Method 2
a photodetector, the photodetector being configured for measuring frequency-shifted scattered light
Implementation Method 3
the illuminating means is configured for coupling into a fiber-optic element
Implementation Method 4
the wavelength of the backscattered radiation depends in particular on the strain state of the fiber-optic element
Data Source
AI summary
In an embodiment an optoelectronic sensor arrangement includes a carrier substrate, an illuminating device, a frequency-selective optical element and a photodetector, wherein the illuminating device and the photodetector form a stacked arrangement on or with the carrier substrate, wherein the frequency-selective optical element is arranged between the illuminating device and the photodetector, wherein the photodetector is arranged in a cavity of the carrier substrate which is covered by the illuminating device and/or the frequency-selective optical element, and wherein the frequency-selective optical element includes a divider mirror and an optical filter.