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A transducer for measuring high frequency oscillatory flow rates.

D Isabey, C Delpuech

Bulletin Europeen De Physiopathologie Respiratoire

|September 1, 1986

Summary

This study introduces a new, low-cost flowmeter for accurate high-frequency measurements. The improved device overcomes limitations of existing systems, enabling precise physiological flow rate analysis.

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Area of Science:

Physiological measurement
Biomedical engineering
Respiratory system analysis

Background:

Existing high-frequency flowmeters (wave tube, loudspeaker) are inadequate for large amplitude oscillations.
Standard pneumotachometers often require complex analytical or numerical corrections for accurate readings.
There is a need for a low-cost, rapid-response flowmeter suitable for high and low flow rates.

Purpose of the Study:

To develop and evaluate a novel, low-cost, rapid-response flowmeter for high-frequency flow rate measurements.
To compare the performance of the new device against a standard medical pressure transducer system.
To assess the suitability of the improved flowmeter for physiological studies.

Main Methods:

Coupling a standard screen pneumotachometer with a recent piezoresistive differential pressure transducer.
Evaluating frequency response using a gas capacitance reference.
Comparing the new device's frequency response to a screen pneumotachometer with a standard low-range medical pressure transducer.
Testing performance with constant peak flow (1.5 L/s) and doubled peak flow rates.

Main Results:

The new flowmeter exhibits a flat amplitude response up to 70 Hz.
Minimal phase delay (9 degrees) is observed up to 90 Hz.
These performance characteristics are maintained even with increased peak flow rates.
The developed device demonstrates superior frequency response compared to the standard system.

Conclusions:

The proposed low-cost flowmeter offers accurate high-frequency flow measurements with rapid response.
It overcomes the limitations of existing systems for large amplitude oscillations and reduces the need for complex corrections.
This improved flowmeter is advantageous for physiological studies requiring precise, high-frequency flow data over short durations.

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