Vessel Sensing Device Automatic Amendment Circuit
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Solution Overview
Problem
Conventional vessel sensors struggle to accurately distinguish between skin texture characteristics and vessel characteristics due to interference from skin color, roughness, and fat thickness, leading to inaccurate physiological monitoring.
Innovation Solution
A vessel sensing device with an optical sensing module, signal generating circuit, and DC voltage detecting circuit that dynamically compensates the analog processing circuit to reduce skin characteristic signals, using switches and gain modules to enhance the ratio of vessel characteristic signals, thereby improving precision and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional vessel sensor is used to monitor physiological parameters, then the device can be worn on skin for convenient portability, but the precision of vessel detection is decreased due to interference from skin color, roughness and fat thickness
Solution Approach 1:
The patent segments the detected signal into two distinct components: skin characteristic signals (DC component representing skin color, roughness, fat thickness) and vessel characteristic signals (AC component representing blood flow). By separating these components in the frequency domain and selectively processing them, the system maintains portability while improving vessel detection precision through automatic noise subtraction.
2Loss of information
If skin characteristic signals are not filtered out, then the analog signal contains complete information, but the vessel characteristic signal cannot be accurately distinguished from skin texture characteristics
Solution Approach 1:
The patent extracts and removes the skin characteristic signal (DC component) from the composite analog signal while preserving the vessel characteristic signal (AC component). This is achieved through automatic amendment circuitry that identifies and subtracts the DC component corresponding to skin texture characteristics, thereby enabling accurate vessel detection without losing essential vessel information.
3Measurement precision
If complex signal processing is performed to remove skin noise, then vessel detection accuracy improves, but power consumption and device complexity increase
Solution Approach 1:
The patent replaces complex digital signal processing operations with analog circuit-based automatic amendment mechanisms. The analog processing circuit automatically subtracts the DC component corresponding to skin noise through voltage-controlled current sources and integrators, achieving high-precision vessel detection without requiring intensive digital computation, thereby minimizing power consumption in wearable devices.
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 device effectively filters out skin noise, enhancing the accuracy of vessel detection with low power consumption and small-size design, while maintaining excellent sensory precision across different skin colors and textures.
Implementation Method 1
an optical sensor of the optical sensing module generates an analog signal with a skin characteristic signal and a vessel characteristic signal according to an optical reflecting signal
Data Source
AI summary
A vessel sensing device with automatic amendment function includes an analog processing circuit, a signal generating circuit and a DC voltage detecting circuit. The analog processing circuit includes an optical sensing module. An optical sensor of the optical sensing module generates an analog signal with a skin characteristic signal and a vessel characteristic signal according to an optical reflecting signal. The skin characteristic signal and the vessel characteristic signal respectively correspond to a skin feature and a vessel feature of the user. The signal generating circuit is coupled to the analog processing circuit to transform the analog signal into a compensation signal. The DC voltage detecting circuit is coupled to the signal generating circuit and adapted to compensate the analog processing circuit according to the compensation signal, so as to decrease the skin characteristic signal within the analog signal.