Ultrasonic measurement of the characteristic acoustic impedance using a directional coupler to analyse reference reflections from thin layers

T. Vössing, J. Rautenberg, A. Schröder, B. Henning, in: 2007.

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Abstract
In this contribution the application of a directional coupler for analysing reference reflections from thin layers in ultrasonic measurement of the characteristic acoustic impedance is presented. In a prior work ([2]) it was shown, that a directional coupler can be used in combination with an ultrasonic transducer to get reflections from layers that are very close to the transducers surface. Since the directional coupler provides the opportunity to send and receive signals at the same time, these layers can be very thin ({\textless} 1 mm). Reflections that arrive at the transducer during the sending process can be analysed because the directional coupler separates the receiving signal from the input signal of the transducer. When only one transducer is used to measure the acoustic impedance of a liquid the reflections from the thin layer reach the transducer after a very short time. The reflections sum up and with the concept of reflection and transmission coefficients a relation is found between the measured amplitude and a reference amplitude which was measured before. The exciting signal could be a burst of some periods of a sinusoidal alternating voltage. The advantages of using thin layers for the described task are the small geometry that allows flexible application of the sensor and the minimisation of temperature gradients within the medium because thin layers can follow thermal fluctuations faster than thick ones. In this paper the functional principle and first achievements are presented.
Publishing Year
Conference
8th International Conference on Electronic Measurement & Instruments, ICEMI 2007
Conference Location
Xi’An, China
Conference Date
16.08.2007 – 18.08.2007
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Vössing T, Rautenberg J, Schröder A, Henning B. Ultrasonic measurement of the characteristic acoustic impedance using a directional coupler to analyse reference reflections from thin layers. In: ; 2007.
Vössing, T., Rautenberg, J., Schröder, A., & Henning, B. (2007). Ultrasonic measurement of the characteristic acoustic impedance using a directional coupler to analyse reference reflections from thin layers. Presented at the 8th International Conference on Electronic Measurement & Instruments, ICEMI 2007, Xi’An, China.
@inproceedings{Vössing_Rautenberg_Schröder_Henning_2007, title={Ultrasonic measurement of the characteristic acoustic impedance using a directional coupler to analyse reference reflections from thin layers}, author={Vössing, Torsten and Rautenberg, Jens and Schröder, Andreas and Henning, Bernd}, year={2007} }
Vössing, Torsten, Jens Rautenberg, Andreas Schröder, and Bernd Henning. “Ultrasonic Measurement of the Characteristic Acoustic Impedance Using a Directional Coupler to Analyse Reference Reflections from Thin Layers,” 2007.
T. Vössing, J. Rautenberg, A. Schröder, and B. Henning, “Ultrasonic measurement of the characteristic acoustic impedance using a directional coupler to analyse reference reflections from thin layers,” presented at the 8th International Conference on Electronic Measurement & Instruments, ICEMI 2007, Xi’An, China, 2007.
Vössing, Torsten, et al. Ultrasonic Measurement of the Characteristic Acoustic Impedance Using a Directional Coupler to Analyse Reference Reflections from Thin Layers. 2007.

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