Title :
Modulation and codification of ultrasonic signals with EMFI transducers
Author :
Seco, Fernando ; Ealo, Joao L. ; Jiménez, Antonio R.
Author_Institution :
Inst. de Autom. Ind., Consejo Super. de Investig. Cientificas (CSIC), Arganda del Rey, Spain
Abstract :
The electromechanical film (EMFi) is a thin polypropylene film with electret properties, high flexibility and large bandwidth. Ultrasonic transducers built with EMFi film can overcome the limited bandwidth of currently available transducers for air applications, and permit the use of spread spectrum CDMA (Code Division Multiple Access) signal processing techniques, with potential benefits in many ultrasonic applications. In this communication we report the use of CDMA techniques with custom built EMFi transducers, applying signal modulation and codification and processing gain for enhanced signal detection and ranging.
Keywords :
acoustic signal processing; code division multiple access; modulation coding; polymer films; ultrasonic transducers; CDMA technique; Code Division Multiple Access; EMFi transducer; electret properties; electromechanical film; flexibility; polypropylene film; ultrasonic signal codification; ultrasonic signal modulation; ultrasonic transducer; Acoustic applications; Bandwidth; Crosstalk; Multiaccess communication; Signal generators; Signal processing; Sonar; Transmitters; Ultrasonic imaging; Ultrasonic transducers;
Conference_Titel :
Ultrasonics Symposium (IUS), 2009 IEEE International
Conference_Location :
Rome
Print_ISBN :
978-1-4244-4389-5
Electronic_ISBN :
1948-5719
DOI :
10.1109/ULTSYM.2009.5441549
