Optical Heartbeat Detection With Tunable Wavelength Filters
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Solution Overview
Problem
Existing heart beat detection systems using optical reflection or transparency methods are prone to noise interference from surrounding light conditions and body movements, leading to an unfavorable signal-to-noise ratio, especially during daily activities or prolonged physical activity.
Innovation Solution
A heart beat detection device with electrically adjustable optical filters and a wireless interface, utilizing tunable monochromators to select desired wavelengths for absorption and fluorescence modes, combined with electrical and mechanical detection systems to enhance signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical reflection or transparency methods are used for heart beat detection, then the device can detect blood volume changes, but the signal-to-noise ratio deteriorates due to surrounding light conditions and body movements
Solution Approach 1:
The patent employs dynamic wavelength tuning through electrically adjustable optical filters (monochromators) that adaptively select optimal wavelengths in real-time. This dynamic adjustment allows the system to optimize light absorption characteristics for different tissue types, depths, and physiological conditions, thereby improving signal-to-noise ratio and detection accuracy while compensating for environmental light interference and movement artifacts
Solution Approach 2:
The system changes the wavelength parameter of the emitted light dynamically using electrically controllable filters. By adjusting the wavelength according to the specific measurement conditions, tissue characteristics, and noise levels, the system optimizes the absorption contrast between blood and surrounding tissue, enhancing the detectability of blood volume changes while filtering out noise from ambient light and motion
2Adaptability or versatility
If fixed wavelength light sources are used, then the device structure is simpler, but the adaptability to different tissue types and measurement conditions deteriorates
Solution Approach 1:
The patent implements dynamic wavelength selection using electrically adjustable optical filters (monochromators) that can be controlled to select different wavelengths as needed. This dynamic capability allows the system to adapt to various tissue types, measurement locations, and physiological conditions without requiring multiple fixed-wavelength light sources, thereby achieving versatility while maintaining relatively simple device architecture through electronic control rather than mechanical or optical switching of multiple sources
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 significantly improves the signal-to-noise ratio by dynamically tuning wavelengths and compensating for skin and movement-related noise, providing accurate heart beat detection in various conditions.
Implementation Method 1
The first wavelength has been chosen from among those wavelengths which are not absorbed by the oxyhaemoglobin (for example red), while the second wavelength is chosen from among those which are better absorbed by the oxyhaemoglobin (for example green)
Implementation Method 2
These systems usually employ a light emitter which by means of reflection or transparency illuminates a suitable receiver after the emitted light has struck or passed through a zone of the body
Implementation Method 3
A heart beat detection device with electrically adjustable optical filters and a wireless interface, utilizing tunable monochromators to select desired wavelengths for absorption and fluorescence modes
Implementation Method 4
utilizing tunable monochromators to select desired wavelengths for absorption and fluorescence modes
Data Source
AI summary
A heart beat detection device comprises at least one optical reflection sensor to be positioned on the skin of a person. The sensor unit is provided with a light emitter and a corresponding light receiver which converts the light reflected by the skin into an electric signal and comprises electrically adjustable optical filters connected to the emitter, to the receiver or to both of them in order to select, upon operation, a desired light wavelength and perform processing of the signals thus obtained in order to reinforce the heart beat signal. A system with this device and a detection method are also described.