Wearable Terminal Heart Rate Accuracy via Motion Compensation
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Solution Overview
Problem
Existing wearable terminals face challenges in accurately measuring pulse waves due to user movement, leading to errors in heart rate detection using photo plethysmography, as the device and blood cells move simultaneously, causing unstable signal patterns and noise interference.
Innovation Solution
A wearable terminal design incorporating a photo plethysmography system with a cover featuring transparent units and a barrier to filter out movement noise, combined with an acceleration sensor to detect and compensate for movement, allowing for accurate heart rate calculation by filtering out noise and adjusting signal strength accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If photo plethysmography is used to measure pulse wave, then heart rate detection function is provided, but measurement precision deteriorates due to user movement causing unstable signal patterns and noise interference
Solution Approach 1:
An acceleration sensor is introduced as an intermediary device to detect user movement. The sensor data serves as a mediator to identify and compensate for movement-induced signal variations in the photo plethysmography measurement, allowing the system to distinguish between physiological signals and movement artifacts.
Solution Approach 2:
The system implements feedback by continuously monitoring acceleration sensor data and using it to adjust or compensate for movement effects on the pulse wave signal. The controller processes both the optical signal and acceleration data together, feeding back correction information to improve heart rate detection accuracy during movement.
2Adaptability or versatility
If wearable terminal continuously monitors body changes, then health monitoring capability is improved, but device complexity increases due to multiple sensors and processing requirements
Solution Approach 1:
The acceleration sensor serves multiple functions: it detects user movement for pulse wave compensation, monitors physical activity levels for health tracking, and can identify device orientation. This multi-functionality allows the system to maintain diverse health monitoring capabilities while avoiding the need for separate dedicated sensors for each function.
Solution Approach 2:
The system merges the data processing of the photo plethysmography sensor and acceleration sensor within a single controller. By combining the signal processing functions and using unified algorithms to handle both sensor inputs, the system reduces overall device complexity while maintaining comprehensive health monitoring capabilities.
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 solution effectively minimizes movement-induced errors, enabling precise heart rate measurement even during user exercise, and calculates calorie consumption based on accurate heart rate data, providing reliable biometric feedback.
Implementation Method 1
a photo plethysmography configured to include a transmitter, which is combined with one side of the main body and outputs a output signal, and a receiver detecting a reflection signal corresponding to the output signal returned in a manner of being reflected
Implementation Method 2
a receiver detecting a reflection signal corresponding to the output signal returned in a manner of being reflected
Implementation Method 3
an acceleration sensor configured to detect a movement of the main body
Data Source
AI summary
A wearable terminal can include a main body configured to be in contact with a body of a user using one side of the main body, a photo plethysmography including a transmitter combined with one side of the main body and outputs a output signal, and a receiver detecting a reflection signal corresponding to the output signal returned, a cover configured to cover the photo plethysmography and be combined with the main body and a controller configured to measure a heart rate based on a reflection signal measured by the photo plethysmography. The cover is combined with the main body and parts corresponding to the transmitter and the receiver of the photo plethysmography include transparent units through which the output signal and the reflection signal are passing and a barrier unit positioned between the transparent units and shielding the output signal and the reflection signal.