Polarization-Selective SMI Sensor for Multi-Location Sensing
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Solution Overview
Problem
Existing sensors in electronic devices, such as smartphones and smart watches, face challenges in providing additional sensing capabilities while maintaining a small form factor, particularly when measuring physical phenomena at multiple locations.
Innovation Solution
The implementation of multi-channel self-mixing interferometric (SMI) sensors using a polarization-selective lens to direct light with different polarizations to separate measurement locations, allowing for compact integration of multiple sensors on a single semiconductor die.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple SMI sensors are integrated to provide additional sensing capabilities, then sensing capability is improved, but device area increases
Solution Approach 1:
Multiple SMI sensors are merged into a single integrated sensor device, sharing common components such as the polarization-selective lens and semiconductor substrate. This combining approach enables multi-channel sensing capabilities while maintaining a compact form factor, as the sensors operate simultaneously through polarization multiplexing rather than requiring separate physical installations
Solution Approach 2:
The patent introduces polarization dimension to differentiate multiple sensing channels. By utilizing orthogonally polarized light beams (different polarization states) from a single sensor location, the system achieves multi-location sensing without increasing the physical footprint, effectively adding a dimensional degree of freedom to the sensing architecture
2Adaptability or versatility
If multiple SMI sensors are used to measure physical phenomena at multiple locations, then measurement coverage is improved, but device complexity increases
Solution Approach 1:
A single SMI sensor device performs multiple sensing functions by detecting physical phenomena at different locations through polarization-multiplexed channels. The unified sensor structure with polarization-selective lens enables one device to accomplish what would traditionally require multiple separate sensors, reducing overall system complexity while maintaining comprehensive measurement coverage
Solution Approach 2:
The polarization-selective lens acts as an intermediary component that directs differently polarized light beams to different measurement locations and routes reflected light back to the appropriate detection channels. This intermediary element enables complex multi-location sensing functionality while maintaining a relatively simple sensor architecture
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 simultaneous measurement of physical phenomena at multiple locations with a significantly reduced footprint, enhancing sensing capabilities without increasing device size.
Implementation Method 1
The polarization-selective lens may be configured to direct the first light in a first direction towards a first location and direct the second light in a second direction towards a second location
Implementation Method 2
The first SMI sensor may generate a first SMI signal based on self-mixing of the reflected portion of the first light, and the second SMI sensor may generate a second SMI signal based on self-mixing of the reflected portion of the second light
Data Source
AI summary
A multi-channel SMI sensor includes an emitter configured to emit light having different polarizations and a polarization-selective lens for directing light having different polarizations towards different locations. The multi-channel SMI sensor is configured to measure physical phenomena at two different locations with a small footprint.