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A high-Q easy-to-handle biconcave resonator for acoustic spectrometry of liquids

R Polacek and U Kaatze

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Ultrasonic resonator cells for liquid attenuation and sound velocity measurements down to 70 kHz are described. The resonators are provided with easy-to-obtain concavely shaped shaving mirrors as acoustic reflectors and separated piezoelectric devices for the coupling of the cell to the electronic set-up. The advantages of this construction are shown. The mode spectrum of the resonators is discussed and measurement and evaluation procedures, also considering higher-order satellite peaks, are presented. Possible sources of experimental errors are specified and examples of measurements are given to illustrate the favourable performance of the cell design.


PACS

85.50.-n Dielectric, ferroelectric, and piezoelectric devices

82.40.-g Chemical kinetics and reactions: special regimes and techniques

43.58.+z Acoustical measurements and instrumentation

06.30.Gv Velocity, acceleration, and rotation

Subjects

Electronics and devices

Instrumentation and measurement

Chemical physics and physical chemistry

Dates

Issue 7 (July 2003)

Received 20 February 2003, accepted for publication 14 May 2003

Published 17 June 2003



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