Wearable PPG Heart Rate Sensing With Distance-Based Power Adjustment
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Solution Overview
Problem
Wearable devices using PPG methods for heart rate detection face reduced accuracy due to changes in the relative position between the device and the user's body, affecting the propagation path of optical signals and resulting in lower reflection intensity.
Innovation Solution
Incorporating a distance sensing module to detect the positional relationship between the optical heart rate sensing module and the user's body, allowing for dynamic adjustment of signal transmission power based on relative position data to compensate for changes in the optical path, thereby improving detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the wearable device is worn loosely or moves relative to the user's body, then the device has better comfort and adaptability, but the optical signal propagation path changes causing reduced detection accuracy
Solution Approach 1:
The patent implements a feedback mechanism where the distance sensing module continuously monitors the relative position between the optical heart rate sensing module and the user's body, and this position information is fed back to dynamically adjust the optical signal transmission power, thereby compensating for position changes and maintaining detection accuracy
Solution Approach 2:
The patent changes the transmission power parameter of the optical signal based on the detected relative position. By adjusting the transmission power according to position data, the system compensates for optical path changes caused by movement or loose wearing, maintaining stable detection accuracy
2Ease of operation
If the relative position between the device and wearing part changes, then the device allows more movement freedom, but the reflection intensity of optical signal decreases
Solution Approach 1:
The system uses feedback from the distance sensing module to monitor changes in optical path length, and automatically adjusts the transmission power to compensate for the decrease in reflection intensity caused by increased distance
Solution Approach 2:
The patent implements dynamic adjustment of the optical signal transmission power based on real-time position detection. The transmission power is not fixed but changes dynamically with the relative position, allowing the system to maintain optimal signal intensity during movement
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 method enhances heart rate detection accuracy by dynamically adjusting the optical signal power in response to positional changes, maintaining stable signal reception and reducing errors caused by changes in the optical path.
Implementation Method 1
The PPG is a method for heart rate measurement based on the principle of photoelectric detection blood volume changes with pulse pulsation
Implementation Method 2
a distance sensing module connected to the processor and installed on a side of the casing facing a wearing part of a user
Data Source
AI summary
Provided are a heart rate detection method and a wearable device. The wearable device includes a casing, a processor installed in the casing, and an optical heart rate sensing module and a distance sensing module connected to the processor and installed on a side of the casing facing a wearing part of a user. The method includes: detecting, by the distance sensing module, a positional relationship between the optical heart rate sensing module and the wearing part of the user to obtain relative position data of the optical heart rate sensing module relative to the wearing part of the user; and adjusting a signal transmission power of the optical heart rate sensing module according to the relative position data, and detecting, by the optical heart rate sensing module, a heart rate of the user.