1. Abstract

• In most ultrasound experiments, ultrasound is generated by a transducer assembly and then received by the same or another assembly. In the time interval between the transmission and the reception of the ultrasonic signal, it is not possible to carry out measurements. All measurement results obtained in such experiments thus can be derived only from the electrical input and output quantities of the test assembly used. As the electrical input quantity - the current supplied to the transmitting transducer assembly - is generally kept constant during the measurement, most of the practical evaluations are restricted to the output quantity, i. e. the voltage the ultrasonic signal produces at the terminals of the receiving transducer assembly. This evaluation method allows, however, only relative results to be obtained.

  It will shown in this publication that the acoustic pressure can also be determined in any place of the sound field in absolute terms if not only the receiving voltage but also the transmitting current are measured and the so-called reciprocity parameter of the test assembly is known. It will be illustrated by examples how the rerciprocity parameter of different test assemblies can be calculated and that this allows the measurement results obtained on different test assemblies and by various laboratories to be directly compared. To estimate the uncertainty of measurement of the method presented, the transducer assembly and sound field data determined are compared with the results obtained by the thermoacoustic method

  In this procedure, the acoustic power emitted by the transducer assembly is determined from the increase in temperature produced by the ultrasonic signal in a sound-absorbing plastic plate.

  Inhalt |Volltext| in German

  1. Abstrakt
  2. Prinzip der quantitativen Schalldruckbestimmung
  3. Der Reziprozitätsparameter
  4. Meßergebnisse
  5. Die charakteristische Sendeempfindlichkeit
  6 Zusammenfassung
  7. Literatur