Development of an Ultrasonic Airflow Measurement Device for Ducted Air

Raine, Andrew, Aslam, Nauman, Underwood, Chris and Danaher, Sean (2015) Development of an Ultrasonic Airflow Measurement Device for Ducted Air. Sensors, 15 (5). pp. 10705-10722. ISSN 1424-8220

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In this study, an in-duct ultrasonic airflow measurement device has been designed, developed and tested. The airflow measurement results for a small range of airflow velocities and temperatures show that the accuracy was better than 3.5% root mean square (RMS) when it was tested within a round or square duct compared to the in-line Venturi tube airflow meter used for reference. This proof of concept device has provided evidence that with further development it could be a low-cost alternative to pressure differential devices such as the orifice plate airflow meter for monitoring energy efficiency performance and reliability of ventilation systems. The design uses a number of techniques and design choices to provide solutions to lower the implementation cost of the device compared to traditional airflow meters. The design choices that were found to work well are the single sided transducer arrangement for a “V” shaped reflective path and the use of square wave transmitter pulses ending with the necessary 180° phase changed pulse train to suppress transducer ringing. The device is also designed so that it does not have to rely on high-speed analogue to digital converters (ADC) and intensive digital signal processing, so could be implemented using voltage comparators and low-cost microcontrollers.

Item Type: Article
Uncontrolled Keywords: acoustics; airflow rate; ultrasonic flowmeter; ventilation air flow measurement; differential transit time method; time difference method; ultrasonic transducer damping; ultrasonic receiver amplifier
Subjects: H300 Mechanical Engineering
K200 Building
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Paul Burns
Date Deposited: 12 May 2015 09:05
Last Modified: 17 Dec 2023 16:36

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