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Sensors 2010, 10(8), 7421-7433; doi:10.3390/s100807421

High Accuracy Acoustic Relative Humidity Measurement inDuct Flow with Air

2, 2 and 2,*
1 Van Schaik Innovation Handling B.V., Glaslaan 2, Building SWA 1.032, 5616 LW, Eindhoven, The Netherlands 2 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 / Revised: 15 July 2010 / Accepted: 30 July 2010 / Published: 9 August 2010
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in The Netherlands)
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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 acoustics; relative humidity; humid air flow
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Schaik, W.; Grooten, M.; Wernaart, T.; Geld, C. High Accuracy Acoustic Relative Humidity Measurement inDuct Flow with Air. Sensors 2010, 10, 7421-7433.

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