[{"year":"2007","page":"87-92","citation":{"ieee":"J. Rautenberg and B. Henning, “New approach for the reliable measurement of acoustic impedance of liquids in an acoustic waveguide,” presented at the 13th International Conference Sensor + Test 2007, Nürnberg, 2007, vol. II, pp. 87–92.","chicago":"Rautenberg, Jens, and Bernd Henning. “New Approach for the Reliable Measurement of Acoustic Impedance of Liquids in an Acoustic Waveguide,” II:87–92, 2007.","ama":"Rautenberg J, Henning B. New approach for the reliable measurement of acoustic impedance of liquids in an acoustic waveguide. In: Vol II. ; 2007:87-92.","bibtex":"@inproceedings{Rautenberg_Henning_2007, title={New approach for the reliable measurement of acoustic impedance of liquids in an acoustic waveguide}, volume={II}, author={Rautenberg, Jens and Henning, Bernd}, year={2007}, pages={87–92} }","mla":"Rautenberg, Jens, and Bernd Henning. <i>New Approach for the Reliable Measurement of Acoustic Impedance of Liquids in an Acoustic Waveguide</i>. Vol. II, 2007, pp. 87–92.","short":"J. Rautenberg, B. Henning, in: 2007, pp. 87–92.","apa":"Rautenberg, J., &#38; Henning, B. (2007). New approach for the reliable measurement of acoustic impedance of liquids in an acoustic waveguide (Vol. II, pp. 87–92). Presented at the 13th International Conference Sensor + Test 2007, Nürnberg."},"publication_identifier":{"isbn":["978-3-9810993-2-4"]},"title":"New approach for the reliable measurement of acoustic impedance of liquids in an acoustic waveguide","conference":{"start_date":"22.05.2007","name":"13th International Conference Sensor + Test 2007","location":"Nürnberg","end_date":"24.05.2007"},"date_updated":"2022-01-06T06:52:20Z","volume":"II","author":[{"full_name":"Rautenberg, Jens","last_name":"Rautenberg","first_name":"Jens"},{"first_name":"Bernd","last_name":"Henning","full_name":"Henning, Bernd","id":"213"}],"date_created":"2019-12-17T13:22:24Z","abstract":[{"lang":"eng","text":"Continuous and reliable concentration measurement of liquids still is a great challenge as the sensor systems have to meet high industrial requirements. Apart from chemical sensors there are a couple of acoustic systems [1] that are well suited for a lot of industrial applications. Most of them determine the amplitude ratio of deflected ultrasound bursts at different boundaries as well as the sound velocity of the liquid in order to calculate its acoustic impedance and therewith its density. The advantages of acoustic sensors are their robustness and their fast response. Their disadvantages are sensitivity against variations of the reference material properties as well as abrasion or soiling of the boundaries. This contribution is about a new model-based method that uses the whole surface of an acoustic waveguide as reference boundary: It has turned out that the principal components of a signal at the end of the waveguide can be assigned to the different propagative acoustic modes (Fig. 1). Therefore it is necessary to use different simulation tools, e.g. FEM and modal analysis (Fig. 2). With this it is possible to determine the amplitudes of each mode by means of one measured signal at the end of the waveguide and Gauss Algorithm even if the transducer is of very simple kind [2]. Therewith it is possible to get redundant information -- one amplitude for each mode -- for the liquid impedance. In addition to that it is possible to generate an acoustic reference signal without information about the liquid impedance but dissipation if we use the fundamental mode. The different signal amplitudes and a model of acoustic wave propagation [2, 3] offer the possibility to distinguish between dissipation in the liquid and attenuation due to the impedance relations. Moreover, if there are enough analysable amplitudes available, variations of the reference material properties can be determined."}],"status":"public","type":"conference","language":[{"iso":"eng"}],"_id":"15339","department":[{"_id":"49"}],"user_id":"15911"},{"title":"Simultaneous transmitting and receiving with ultrasonic sensors","conference":{"start_date":"22.05.2007","name":"3th International Conference Sensor + Test 2007","location":"Nuremberg","end_date":"24.05.2007"},"date_updated":"2022-01-06T06:52:21Z","author":[{"first_name":"Torsten","last_name":"Vössing","full_name":"Vössing, Torsten"},{"first_name":"Jens","full_name":"Rautenberg, Jens","last_name":"Rautenberg"},{"full_name":"Kehl, Romina","last_name":"Kehl","first_name":"Romina"},{"first_name":"Bernd","full_name":"Henning, Bernd","id":"213","last_name":"Henning"}],"date_created":"2019-12-17T14:22:24Z","year":"2007","citation":{"short":"T. Vössing, J. Rautenberg, R. Kehl, B. Henning, in: 2007.","bibtex":"@inproceedings{Vössing_Rautenberg_Kehl_Henning_2007, title={Simultaneous transmitting and receiving with ultrasonic sensors}, author={Vössing, Torsten and Rautenberg, Jens and Kehl, Romina and Henning, Bernd}, year={2007} }","mla":"Vössing, Torsten, et al. <i>Simultaneous Transmitting and Receiving with Ultrasonic Sensors</i>. 2007.","apa":"Vössing, T., Rautenberg, J., Kehl, R., &#38; Henning, B. (2007). Simultaneous transmitting and receiving with ultrasonic sensors. Presented at the 3th International Conference Sensor + Test 2007, Nuremberg.","ama":"Vössing T, Rautenberg J, Kehl R, Henning B. Simultaneous transmitting and receiving with ultrasonic sensors. In: ; 2007.","ieee":"T. Vössing, J. Rautenberg, R. Kehl, and B. Henning, “Simultaneous transmitting and receiving with ultrasonic sensors,” presented at the 3th International Conference Sensor + Test 2007, Nuremberg, 2007.","chicago":"Vössing, Torsten, Jens Rautenberg, Romina Kehl, and Bernd Henning. “Simultaneous Transmitting and Receiving with Ultrasonic Sensors,” 2007."},"publication_identifier":{"isbn":["978-3-9810993-2-4"]},"language":[{"iso":"eng"}],"_id":"15344","user_id":"15911","department":[{"_id":"49"}],"abstract":[{"lang":"eng","text":"In many applications ultrasonic transducers are used for transmitting and receiving ultrasonic waves. Ultrasonic sensor systems meet the practical requirements of industrial applications quite well. Typical sensor applications are for example the measurement of distance and thickness. Especially if only one ultrasonic transceiver and the well-known pulse-echo-method are used, the sensor electronics has to switch from transmitting to receiving mode. This is one of the most limiting properties because the probe can not receive echoes from nearby obstacles or thin material layers. This contribution deals with the development of an electronic interface circuit for ultrasonic sensors allowing transmitting and receiving of acoustic signals simultaneously. There are already several methods to separate the transmitted from the received signal for instance the well-known circulator in the telephone, the differential transformer mentioned by Bradfield [1] or a directional coupler [2]. The directional coupler consists of two broadband transformers linked with each other in such a way that it equally distributes the input power at port one to the third and fourth port, while port two is isolated. This circuit is also known as 3 dB directional coupler and makes it possible to get reference echoes directly from the interface between the sensor and the medium of interest. Several reflectors or multiple sound paths such as used in ultrasonic density measurement systems are unnecessary [3]."}],"status":"public","type":"conference"}]