Optical Sensor Gain Control for Wearable Bioinformation

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Solution Overview

Problem

Existing wearable devices with optical sensors face challenges in optimizing bioinformation measurement quality and power consumption, as signal quality can vary due to factors like device placement and ambient conditions, leading to inconsistent data and inefficient power usage.

Innovation Solution

The implementation of a method that adjusts the gain of the receiver module based on detected light intensity thresholds, discards or performs detection based on intensity levels, and includes a skin detection circuitry to wake up the device from power-saving mode when skin is present, allowing for optimized bioinformation measurement and power management.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the receiver module operates continuously with high gain to ensure accurate bioinformation measurement, then measurement precision is improved, but power consumption increases

Engineering Contradiction:

Improvebioinformation measurement accuracyVSAvoidpower consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The receiver module gain is dynamically adjusted based on detected light intensity levels. The system transitions between different gain states (high gain for low light, low gain for high light) to optimize both measurement accuracy and power consumption according to ambient conditions

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system implements periodic light intensity detection and gain adjustment cycles, allowing the receiver module to operate in power-saving modes during periods of stable conditions while maintaining measurement readiness, rather than continuously operating at full power

Inventive Principle:

Principle #19Periodic action

2Reliability

If the device remains in normal mode to perform continuous skin detection and bioinformation measurement, then measurement reliability is improved, but power consumption increases

Engineering Contradiction:

Improvemeasurement reliabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The system implements periodic skin detection checks to determine when to wake from power-saving mode. By performing detection at intervals rather than continuously, the system maintains the ability to reliably detect skin presence while significantly reducing power consumption during non-detection periods

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The skin detection circuitry autonomously monitors conditions and automatically triggers device wake-up when skin is detected, eliminating the need for continuous user interaction or system-wide active monitoring while maintaining measurement reliability

Inventive Principle:

Principle #25Self-service

3Measurement precision

If the receiver module uses high gain to detect weak light signals, then measurement precision is improved, but susceptibility to noise and saturation increases

Engineering Contradiction:

Improveweak signal detection capabilityVSAvoidnoise susceptibility and signal saturation

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system uses feedback from light intensity detection to automatically adjust receiver module gain settings. By monitoring the received signal level and comparing it to threshold values, the system adjusts gain to maintain optimal signal-to-noise ratio and prevent saturation

Inventive Principle:

Principle #23Feedback

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 bioinformation measurement by selecting optimal signal quality and reduces power consumption by dynamically adjusting receiver gain and entering power-saving modes when necessary, improving user experience and device efficiency.

Implementation Method 1

detecting, by the receiver module, a received light intensity

Methodology Applied

Scientific EffectPhotoelectric effect: Photoelectric Effect

Data Source

PatentUS20240156410A1System and Method for Optical Sensor Measurement Control

Publication Date: 2024.05.16 ARTILUX INC

AI summary

Methods for determining a signal quality index for bioinformation measurement are disclosed herein. The method can include detecting a light intensity when the transmitter module is in an off state. The method can include comparing the light intensity to a first threshold. The method can include decreasing the gain of the receiver module when the light intensity is greater than the first threshold. The method can include comparing the light intensity to a second threshold when the light intensity is less than the first threshold. The method can include decreasing the gain of the receiver module when the light intensity is greater than the second threshold. The method can include comparing the light intensity to a third threshold when the light intensity is less than the second threshold. The method can include increasing the gain of the receiver module when the light intensity is less than the third threshold.