Physiological Sensor with Same-Side RGB Lighting for Versatile Body Monitoring
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Solution Overview
Problem
Current physiological feature sensors, such as blood oxygen content sensors, are limited to specific body locations like fingers and earlobes due to their clip-on design, restricting their usability and accuracy.
Innovation Solution
A sensing apparatus with a lighting unit and light sensing unit on the same side of the test subject, utilizing red, green, and blue light sources to transmit and adjust white light for precise physiological feature measurement, including blood oxygen content, by filtering based on skin color and issuing warnings for abnormal changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If clip-on devices are used for sensing physiological features, then the sensing can be performed on specific body locations like fingers and earlobes, but the sensing range is limited and convenience is reduced
Solution Approach 1:
The sensing apparatus is designed to be integrated into portable electronic products, allowing it to function as both a general electronic device and a physiological sensor. The light source and sensor can detect physiological features on various body parts including wrist, arm, and other locations beyond traditional finger clip-on devices, making the system universally applicable to multiple sensing scenarios and body locations.
2Measurement precision
If traditional clip-on sensors are used, then the device structure is simple, but the measurement precision is limited due to restricted application locations
Solution Approach 1:
The patent combines multiple light sources (red, green, blue LEDs) and their corresponding sensors into a single integrated sensing apparatus. This merging of multiple sensing components enables the system to compensate for signal variations caused by different skin colors and body locations, thereby improving measurement precision while managing device complexity through integrated design.
Solution Approach 2:
The system uses multiple wavelengths of light (red, green, blue) to probe physiological features at different depths and conditions. By changing the light wavelength parameter, the system can optimize penetration depth and scattering characteristics for different body locations and skin types, thereby improving measurement precision across diverse application scenarios.
3Measurement precision
If single wavelength light is used for sensing, then the device complexity is low, but the measurement accuracy is insufficient due to skin color interference
Solution Approach 1:
The patent assigns different wavelengths of light to different sensing functions: red light for deeper tissue penetration, green light for intermediate depth, and blue light for superficial measurements. Each wavelength targets specific tissue layers and physiological features, allowing the system to compensate for skin color variations by selecting appropriate wavelengths for each measurement context, thereby improving accuracy while managing complexity through specialized wavelength assignment.
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 expands the sensing range to various body parts, enhances measurement precision by adjusting light color based on reflected wavelengths, and reduces false positives by considering skin color, thereby improving the reliability of blood oxygen content and other physiological feature measurements.
Implementation Method 1
The lighting unit transmits a first white light to the portion under test, so as to irradiate the first white light to a dermis of the portion under test, wherein the first white light is formed by lights respectively emitted by the red light source, the green light source and the blue light source
Implementation Method 2
The light sensing unit senses a first reflected light, and the controller executes a measurement operation for the physiological feature based on a first color wavelength of the first reflected light
Data Source
AI summary
A method for sensing a physiological feature is provided. A sensing apparatus is provided for sensing the physiological feature. The sensing apparatus includes a lighting unit, a light sensing unit, and a controller. The lighting unit and a light sensing unit are located on the same side of a portion under test of a testing subject. The lighting unit transmits a white light to the portion under test. The light sensing unit senses a reflected light. And the controller executes a measurement operation for the physiological feature based on a color wavelength of the reflected light.