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High Accuracy Acoustic Relative Humidity Measurement inDuct Flow with Air
Van Schaik Innovation Handling B.V., Glaslaan 2, Building SWA 1.032, 5616 LW, Eindhoven, The Netherlands
Process Technology, Department of Mechanical Engineering, Eindhoven University of Technology, Den Dolech 2, 5600 MB, Eindhoven, The Netherlands
* Author to whom correspondence should be addressed.
Received: 20 June 2010; in revised form: 15 July 2010 / Accepted: 30 July 2010 / Published: 9 August 2010
Abstract: An acoustic relative humidity sensor for air-steam mixtures in duct flow is designed and tested. Theory, construction, calibration, considerations on dynamic response and results are presented. The measurement device is capable of measuring line averaged values of gas velocity, temperature and relative humidity (RH) instantaneously, by applying two ultrasonic transducers and an array of four temperature sensors. Measurement ranges are: gas velocity of 0–12 m/s with an error of ±0.13 m/s, temperature 0–100 °C with an error of ±0.07 °C and relative humidity 0–100% with accuracy better than 2 % RH above 50 °C. Main advantage over conventional humidity sensors is the high sensitivity at high RH at temperatures exceeding 50 °C, with accuracy increasing with increasing temperature. The sensors are non-intrusive and resist highly humid environments.
Keywords: acoustics; relative humidity; humid air flow
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MDPI and ACS Style
Schaik, W.; Grooten, M.; Wernaart, T.; Geld, C. High Accuracy Acoustic Relative Humidity Measurement inDuct Flow with Air. Sensors 2010, 10, 7421-7433.
Schaik W, Grooten M, Wernaart T, Geld C. High Accuracy Acoustic Relative Humidity Measurement inDuct Flow with Air. Sensors. 2010; 10(8):7421-7433.
Schaik, Wilhelm van; Grooten, Mart; Wernaart, Twan; Geld, Cees van der. 2010. "High Accuracy Acoustic Relative Humidity Measurement inDuct Flow with Air." Sensors 10, no. 8: 7421-7433.