Vital Capacity Measurement via Pressure Differential
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Solution Overview
Problem
Current mobile phones and wearable devices use microphones to measure vital capacity, which are prone to damage due to high-frequency pressure and result in low precision measurements.
Innovation Solution
A method and apparatus utilizing a pressure sensor to measure static pressure and air pressure differential to calculate air flow speed and vital capacity, avoiding the use of microphones and enhancing measurement precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a microphone is used to measure vital capacity, then the measurement can be performed, but the measurement precision is low and the microphone is prone to damage
Solution Approach 1:
The patent extracts the pressure sensing function from the microphone component. Instead of using the microphone's diaphragm to detect pressure changes (which causes damage and low precision), the invention introduces a dedicated pressure sensor that is more robust and accurate for measuring pressure differential, thereby resolving the contradiction between measurement precision and component reliability
Solution Approach 2:
The patent replaces the acoustic-mechanical system (microphone diaphragm vibrating due to air pressure) with a pressure-based measurement system (pressure sensor measuring pressure differential). This substitution eliminates the mechanical vibration issue that causes microphone damage while providing more accurate pressure measurements for vital capacity calculation
2Ease of operation
If a microphone diaphragm is used to detect air pressure, then vital capacity can be measured, but the diaphragm breaks under high-frequency pressure
Solution Approach 1:
The invention extracts the pressure detection function from the microphone diaphragm and implements it through a separate pressure sensor. This separation allows the pressure sensor to handle high-frequency pressure variations without the structural limitations of a thin diaphragm, thereby maintaining ease of operation while improving component strength
Solution Approach 2:
The patent employs a pressure sensor that is more durable and designed to withstand high-frequency pressure changes, replacing the fragile microphone diaphragm. The pressure sensor acts as a robust alternative that doesn't break under stress, ensuring reliable operation during vital capacity testing
3Measurement precision
If a pressure sensor is used to measure air pressure differential, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent utilizes the existing pressure hole structure in the mobile device (which serves other functions like ventilation or acoustic coupling) as part of the pressure measurement system. By integrating the pressure sensor into this existing structure and using the same opening for both original purpose and pressure measurement, the invention reduces device complexity while achieving improved measurement precision
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
This approach improves vital capacity measurement precision without damaging device components and offers a distinct method from traditional microphone-based techniques.
Implementation Method 1
obtaining an air flow speed v(t) corresponding to each moment according to a correspondence relation formula between the air flow speed v(t) and a pressure differential P(t)−P0
Implementation Method 2
measuring a static pressure P0 of a pressure hole inner cavity of a mobile device; obtaining an air pressure P(t) at each moment by blowing air towards the pressure hole
Data Source
AI summary
The present application discloses a method and apparatus for testing vital capacity. The method comprises: measuring a static pressure P0 of a pressure hole inner cavity of a mobile device; wherein the pressure hole is communication with the exterior and is purposely disposed on the mobile device or is an already-designed opening; obtaining an air pressure P(t) at each moment by blowing air towards the pressure hole; obtaining an air flow speed v(t) corresponding to each moment according to a correspondence relation formula between the air flow speed v(t) and a pressure differential P(t)−P0; and obtaining vital capacity Vc of the subject according to a correspondence relationship between a measurement time t and the air flow speed v(t).