Waveguide for Optical Sensor Coherent Mixing
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Solution Overview
Problem
Integrating optical sensors into wearable devices is challenging due to size and power constraints, limiting their ability to provide detailed biometric and health data sensing capabilities.
Innovation Solution
A waveguide configuration for optical sensors that includes an input, splitter, subject output aperture, reference coupler, subject input aperture, combiner, mixer, and measuring aperture, which coherently mixes electromagnetic radiation to isolate doppler shifts and modes, enabling effective sensing of physical phenomena while maintaining a small form factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If optical sensors are integrated into wearable devices, then sensing capability is improved, but device size and power consumption increase
Solution Approach 1:
The waveguide integrates multiple optical components (splitter, reference coupler, combiner, mixer) within a single compact structure that fits within the wearable device form factor. The nested configuration allows these components to be arranged in a space-efficient manner, enabling complex optical sensing functionality without proportionally increasing device volume.
Solution Approach 2:
The waveguide utilizes three-dimensional spatial arrangement and light propagation through multiple dimensions to achieve compact integration. By directing light through the waveguide structure in multiple directions and planes, the system accomplishes complex optical processing within a reduced footprint suitable for wearable applications.
2Measurement precision
If waveguide structure is used for optical sensing, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The waveguide is divided into distinct functional segments including an input region, splitter region, reference coupler region, combiner region, mixer region, and output region. Each segment performs a specific optical function, allowing the complex overall system to be designed and manufactured through modular fabrication processes while maintaining precise control over light propagation and mixing.
Solution Approach 2:
The waveguide structure serves multiple functions simultaneously: it guides light from the source, splits the light into measurement and reference portions, combines the reflected measurement light with the reference light, and mixes the signals to isolate doppler shifts. This multi-functionality within a single component reduces the number of discrete parts needed while achieving precise measurement capability.
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 new optical sensing capabilities in wearable devices, allowing for the measurement of biometric data and movement-related information with improved sensitivity and reduced noise, suitable for small-footprint applications.
Implementation Method 1
The mixer is configured to coherently mix the reference portion of electromagnetic radiation and the reflections of the measuring portion of electromagnetic radiation
Implementation Method 2
The mixer is configured to coherently mix the reference portion of electromagnetic radiation and the reflections of the measurement portion of electromagnetic radiation to isolate a doppler shift in the measurement portion of the electromagnetic radiation
Data Source
AI summary
An optical sensor includes a waveguide for directing, receiving, and coherently mixing electromagnetic radiation from an electromagnetic radiation source to detect one or more physical phenomena. The waveguide is integrable into a printed circuit board, allowing the optical sensor to maintain a small footprint.