Multi-Wavelength Wearable Orientation Detection for Physiological Sensing

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Solution Overview

Problem

Wearable devices face accuracy issues in collecting physiological data due to varying orientations of optical components, which affect signal quality and reliability.

Innovation Solution

The wearable device uses multiple light-emitting components to transmit light of different wavelengths, allowing it to determine its orientation based on the ratio of signal strengths received by photodetectors, and adjusts measurement parameters accordingly to improve data accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the wearable device uses a single optical component orientation, then the device structure is simple, but the physiological data accuracy deteriorates due to orientation-related signal variations

Engineering Contradiction:

Improveoptical component configurationVSAvoidphysiological data accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent applies parameter changes by using multiple light wavelengths (e.g., red and infrared) with different tissue penetration characteristics. By comparing signal strengths at these different wavelengths, the system can detect orientation variations and compensate for them, thereby maintaining measurement precision without requiring complex mechanical orientation control

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces mechanical orientation control with an optical-based detection system. Instead of mechanically adjusting the optical components to maintain fixed orientation, the system uses wavelength-dependent light absorption and scattering properties to detect and compensate for orientation changes, substituting mechanical complexity with optical measurement and computational correction

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If the wearable device uses multiple light wavelengths to detect orientation, then the physiological data accuracy improves, but the energy consumption increases

Engineering Contradiction:

Improvephysiological data accuracyVSAvoidpower consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent implements periodic action by alternately activating different light-emitting diodes (LEDs) at different wavelengths in a time-multiplexed manner. Rather than continuously powering all LEDs simultaneously, the system cycles through them sequentially, collecting spectral data over time. This reduces instantaneous and average power consumption while still enabling orientation detection through multi-wavelength comparison

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent applies partial action by selectively activating only the necessary subset of LEDs based on current measurement needs. The system can adjust which wavelengths are used and how intensively they are emitted depending on the specific physiological parameter being measured and the detected orientation, avoiding unnecessary energy expenditure from using all available light sources at full power

Inventive Principle:

Principle #16Partial or excessive action

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 approach enhances the accuracy of physiological data collection by compensating for orientation-related signal variations, ensuring higher quality data and reduced power consumption.

Implementation Method 1

a wearable device may include at least a photodetector and a light-emitting component. Using the light-emitting component, the wearable device may transmit first light and second light towards the finger of the user and using the photodetector, the wearable device may receive the first light and the second light

Methodology Applied

Scientific EffectPhotoelectric Effect: Photoelectric Effect

Data Source

PatentUS12436563B2Detecting an orientation of a wearable device using different wavelengths of transmitted light

Publication Date: 2025.10.07 OURA HEALTH OY

AI summary

Methods, systems, and devices for detecting an orientation of a wearable device are described. The method may include the wearable device transmitting, using a light-emitting component, first light and second light and generating a first signal and a second signal based on the first light and the second light, respectively, received using photodetectors. The first and second light may be associated with first and second wavelengths, where signals associated with the first wavelength are relatively unaffected by varying orientations of the wearable device, whereas signals associated with the second wavelength vary based on different orientations of the wearable device. Further, the wearable device may determine an orientation of the wearable device worn by the user based on a comparison of a first signal and the second signal, and may acquire physiological data from the user via the wearable device using measurement parameters that are determined based on the orientation.