Abstract
This paper introduces an ultrasonic measurement system to determine the mean temperature of the air between source and receiver. The system uses measurement of changes in the local speed of sound in the air to determine the temperature of the air. The changes in the speed of sound are determined by multi-frequency continuous wave frequency modulation (MFCWFM) techniques. This paper present a simple but efficient algorithm based upon phase shifts generated by three ultrasonic waves of different frequencies. To confirm concept feasibility, two low cost 25 kHz ultrasonic transducers were positioned face to face and used to transmit and receive ultrasound. Frequency modulation of the 25 KHz carrier frequency was used to transmit three frequencies; 25kHz, 1 kHz and 100 Hz. The proposed method can give a more accurate measurement of temperature than the time of flight (TOF) and phase shift (PS) methods. The range accuracy was found to be 0.07°C. The main advantages of this system are high resolution and ease of implementation.
Original language | English |
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Title of host publication | Proceedings of the 9th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2009 |
Editors | Hendrik Van Brussel, Theresa Burke, H. Spaan, E. Brinksmeier, Theresa Burke, Theresa Burke |
Publisher | euspen |
Pages | 134-137 |
Number of pages | 4 |
Volume | 2 |
ISBN (Electronic) | 9780955308260 |
Publication status | Published - 2009 |
Event | 9th International Conference of the European Society for Precision Engineering and Nanotechnology - San Sebastian, Spain Duration: 2 Jun 2009 → 5 Jun 2009 Conference number: 9 |
Conference
Conference | 9th International Conference of the European Society for Precision Engineering and Nanotechnology |
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Abbreviated title | EUSPEN 2009 |
Country/Territory | Spain |
City | San Sebastian |
Period | 2/06/09 → 5/06/09 |