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A pulsed diagonal-beam ultrasonic airflow meter
Journal of Applied Physiology (Bethesda, Md. : 1985)
|September 1, 1986
Summary
A novel ultrasonic flowmeter accurately measures respiratory airflow using transit time measurements. This device offers high speed and precision for spirometry and breath-by-breath analysis.
Area of Science:
- Biomedical Engineering
- Respiratory Physiology
Background:
- Accurate measurement of respiratory airflow is crucial for diagnosing and monitoring respiratory conditions.
- Existing spirometry devices may have limitations in speed, accuracy, or noise levels.
Purpose of the Study:
- To describe the construction and function of a new ultrasonic flowmeter for respiratory airflow analysis.
- To evaluate the performance characteristics of this novel device.
Main Methods:
- Utilized ultrasonic pulse trains transmitted upstream and downstream to measure airflow transit times.
- Developed a system comprising a control unit and a flow head with capacitive ultrasonic transducers.
- Integrated a fast temperature sensor for comprehensive respiratory data acquisition.
Main Results:
- Achieved a fast response time of 1-2 ms and high volume accuracy (+/- 0.7%).
- Demonstrated a wide bidirectional flow range (0 to 9 L/s) with low noise (<9 ml/s).
- Exhibited a flat frequency response up to 70 Hz, suitable for dynamic respiratory maneuvers.
Conclusions:
- The new ultrasonic flowmeter is a fast, accurate, and versatile tool for respiratory airflow measurement.
- It is suitable for both spirometric maneuvers and long-term breath-by-breath analysis.
- The device's performance characteristics indicate its potential for clinical and research applications.