Optoelectronic Sensor Phantom Layer Signal Compensation
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Solution Overview
Problem
Existing optoelectronic sensors face challenges in accurately measuring blood pulse due to external interferences, such as movement, which cause distortions in the data, limiting measurement accuracy and sensitivity.
Innovation Solution
An optoelectronic sensor system comprising a light source, a first receiver, a second receiver, and a phantom material layer, where the processor inverts and combines the signals from both receivers to apply a compensation factor, minimizing distortions and improving anti-interference capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single receiver is used to detect blood pulse, then the device structure is simple, but measurement accuracy is reduced due to external interferences
Solution Approach 1:
The sensor is divided into two functional segments: a first receiver that detects light reflected from the user's skin to obtain blood pulse information, and a second receiver that detects light reflected from a phantom material layer to obtain interference information. By segmenting the detection functions, the system can separately acquire and process signals from different sources, enabling accurate blood pulse measurement while compensating for external interferences.
Solution Approach 2:
A phantom material layer is introduced as an intermediary element that mimics the optical properties of human skin. This phantom material serves as a reference that experiences the same external interferences (such as motion artifacts and environmental light changes) as the user's skin, allowing the system to subtract these common-mode interferences from the blood pulse signal and improve measurement accuracy.
2Reliability
If no compensation mechanism is applied, then the device operation is simple, but measurement reliability deteriorates under external interferences
Solution Approach 1:
The system implements a feedback mechanism where the second receiver continuously monitors the interference signal from the phantom material layer, and this interference information is fed back to compensate for the blood pulse signal from the first receiver. The processor dynamically adjusts the blood pulse measurement by subtracting the interpolated interference components, ensuring reliable measurements even under varying external conditions.
Solution Approach 2:
The phantom material layer is pre-configured to have optical properties that closely match human skin, and the second receiver is positioned to capture interference signals before they contaminate the blood pulse measurement. By preliminarily capturing the interference characteristics through the phantom material, the system can proactively compensate for these interferences in the final blood pulse signal.
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
The system effectively reduces distortions caused by external interferences, enhancing the accuracy and sensitivity of blood pulse measurement by compensating for signal distortions and adjusting the baseline of the blood pulse waveform.
Implementation Method 1
a first receiver on the base substrate and on one side of the light source... configured to generate a first photo signal based on a light emitted from the light source and reflected from a skin of a user
Implementation Method 2
The first receiver may be configured to generate a first photo signal based on a light emitted from the light source and reflected from a skin of a user, and convert the first photo signal into a first electrical signal
Implementation Method 3
a second receiver on the base substrate and on a different side of the light source from the first receiver... configured to generate a second photo signal based on a light emitted from the light source and reflected from the phantom material layer
Implementation Method 4
The second receiver may be configured to generate a second photo signal based on a light emitted from the light source and reflected from the phantom material layer, and convert the second photo signal into a second electrical signal
Data Source
AI summary
An optoelectronic sensor, a control method for the optoelectronic sensor, and a pulse monitor including the optoelectronic sensor. The optoelectronic sensor may include a light source, a first receiver, a second receiver, and a phantom material layer that is facing a light-emitting side of the light source and at least partially overlapping with the second receiver.