Group III-V Optical Sensor Layout for Stable Physiological Signal Detection
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Solution Overview
Problem
Non-invasive optical sensing devices face challenges in accurately detecting physiological signals due to unstable light reception and noise interference, especially during physical activity, which affects the accuracy and stability of measurements.
Innovation Solution
The optical sensing device incorporates a light-receiving device made of group III-V semiconductor material with a large external quantum efficiency, positioned to receive light with a specific wavelength, and is designed with a carrier body and light-emitting devices to minimize crosstalk and enhance signal detection, using a light-absorbing or light-reflective material for the carrier body to reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional light-receiving device is used, then the device structure is simple, but the detection limit is low and the signal-to-noise ratio is poor
Solution Approach 1:
The patent changes the material parameter of the light-receiving device from conventional materials to group III-V semiconductor materials, which have inherently higher external quantum efficiency. This material parameter change directly improves the detection limit and signal-to-noise ratio without requiring complex structural modifications
Solution Approach 2:
The patent employs group III-V semiconductor materials, which are composite semiconductor materials combining elements from groups III and V of the periodic table. These composite materials provide superior optoelectronic properties including high external quantum efficiency, enabling improved detection performance
2Adaptability or versatility
If the optical sensing device is used during exercise, then the monitoring capability is enhanced, but the relative position and distance between the device and skin becomes unstable causing inaccurate results
Solution Approach 1:
The patent improves the light-receiving device's parameter of external quantum efficiency to a significantly high level. This enhanced parameter allows the device to detect weak optical signals more reliably, compensating for the instability in device-skin distance and position that occurs during exercise, thereby maintaining measurement accuracy
3Measurement precision
If the light-receiving device area is increased, then the light reception capability is improved, but the device size becomes larger
Solution Approach 1:
The patent changes the material composition parameter to group III-V semiconductor materials which possess inherently high external quantum efficiency. This material parameter change enables the light-receiving device to achieve superior light reception capability without requiring an increase in device area, thus maintaining a compact form factor
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 configuration improves the detection limit and signal-to-noise ratio, leading to more accurate and stable detection of physiological signals such as heart rhythm, blood oxygen level, and blood pressure, even during movement.
Implementation Method 1
the light-receiving device is capable of receiving a first received wavelength having a largest external quantum efficiency
Implementation Method 2
With the properties of light absorption, light scattering, and light reflection, the optical sensing device can receive a portion of the returned measuring light
Implementation Method 3
a first light-emitting device disposed on the carrier body
Data Source
AI summary
This disclosure discloses an optical sensing device. The device includes a carrier body; a first light-emitting device disposed on the carrier body; and a light-receiving device including a group III-V semiconductor material disposed on the carrier body, including a light-receiving surface having an area, wherein the light-receiving device is capable of receiving a first received wavelength having a largest external quantum efficiency so the ratio of the largest external quantum efficiency to the area is ≥13.