Capacitive Pulse Measurement via Wrist Proximity
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Solution Overview
Problem
Conventional pulse measurement devices using fiber material belts on the wrist are uncomfortable for users, necessitating a more user-friendly approach.
Innovation Solution
An electronic device equipped with a cap-pressure sensor, capacitive type touch control unit, capacitance counting unit, and spectrum analysis unit that senses pulse through capacitive changes, allowing for pulse measurement without the need for a tight wristband, using a capacitive type touch screen to display pulse rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fiber material belt is wrapped tightly on the wrist to measure pulse, then pulse measurement accuracy is improved, but user comfort deteriorates
Solution Approach 1:
The patent replaces the mechanical pressure-based pulse detection system with a capacitive sensing system. Instead of using a fiber belt that applies mechanical pressure to detect pulse, the invention uses a capacitive touch screen that detects changes in capacitance caused by the proximity of the wrist, thereby eliminating the need for tight mechanical binding while maintaining measurement capability
Solution Approach 2:
The patent introduces capacitance as an intermediary parameter to detect pulse. Rather than directly measuring mechanical pressure or optical properties, the system uses capacitance changes that occur when the wrist approaches the touch screen surface as a mediator to infer pulse rate, enabling non-contact or minimal-contact measurement
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
Enables comfortable and accurate pulse measurement by detecting capacitive changes in the wrist, providing real-time pulse rate data without the discomfort of a traditional belt, enhancing user experience.
Implementation Method 1
An electronic device equipped with a cap-pressure sensor, capacitive type touch control unit, capacitance counting unit, and spectrum analysis unit that senses pulse through capacitive changes
Data Source
AI summary
The present disclosure provides an electronic device and a method of measuring pulse adapted for the device. The electronic device includes a capacitive type touch control unit to sense the change of pulse and the capacitive type touch control unit includes a capacitor. The method includes steps: detecting a pulse of a user in real time and sampling the pulse every sample period, measuring charge-discharge time of the capacitor according to the sampled pulse at each sample period, counting a capacitance value of the capacitor according to the charge-discharge time corresponding to each sampled pulse, and forming a first wave form showing all counted capacitance values of the capacitor. Doing a spectrum analysis of the all counted capacitance values and performing a Fourier Transform to obtain a second wave form of pulse frequency-amplitude, and displaying the second wave form.