Exhalation Measurement Device Zero Point Correction Flow Regulator
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Solution Overview
Problem
Conventional exhalation measurement devices face challenges in accurately performing zero point correction of pressure sensors due to disturbances caused by user movement or gas flow, leading to measurement inaccuracies.
Innovation Solution
The device incorporates a flow regulator with an exhalation inflow and outflow component, a flow adjuster, pressure sensors, and offset adjusters that allow for separate and linked states, enabling accurate zero point correction even with gas flow disturbances by using a chamber and open channel configuration to maintain atmospheric pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If zero point correction is performed using a pressure sensor at the inlet or outlet, then flow control accuracy is improved, but measurement accuracy deteriorates due to disturbance from user movement or gas flow
Solution Approach 1:
The flow regulator is divided into separate components: an exhalation inflow component and an exhalation outflow component. The pressure sensor is specifically placed in the outflow component where gas flow disturbance is minimal, allowing accurate zero point correction while maintaining flow control accuracy.
Solution Approach 2:
A communication hole is introduced as an intermediary element between the inflow and outflow components. This hole allows atmospheric pressure to act as a reference medium, enabling the system to distinguish between atmospheric pressure changes and actual flow-related pressure changes during zero point correction.
2Reliability
If the flow regulator controls exhalation flow accurately, then measurement reliability is improved, but device complexity increases due to multiple sensors and adjustment mechanisms
Solution Approach 1:
The outflow component serves multiple functions: it controls exhalation flow, houses the pressure sensor for zero point correction, and provides a reference pressure measurement point. This multi-functionality reduces the need for separate components, thereby managing device complexity while maintaining reliability.
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 configuration ensures accurate zero point correction of pressure sensors, reducing the impact of environmental changes and user movement on measurement accuracy, making the device more convenient and reliable for exhalation measurements.
Implementation Method 1
an inflow pressure sensor that senses the pressure of the exhalation inflow component (9), an outflow pressure sensor that senses the pressure of the exhalation outflow component (10)
Data Source
AI summary
Certain implementations relate to an exhalation measurement device that is used in checking pulmonary function, diagnosing asthma, and may perform zero point correction accurately even when there is disturbance. The exhalation measurement device may comprise a flow regulator. The flow regulator comprises a first offset adjuster that puts an exhalation inflow component and an exhalation outflow component in a separated state and performs first offset adjustment of an inflow pressure sensor and an outflow pressure sensor, a voltage difference detector that puts the exhalation inflow component and the exhalation outflow component in a linked state and detects an output voltage difference after the first offset adjustment of the inflow pressure sensor and the outflow pressure sensor, and a second offset adjuster that uses the output voltage difference to perform second offset adjustment of the inflow pressure sensor.