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

fYear

2009

fDate

20-23 Sept. 2009

Firstpage

1726

Lastpage

1729

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium (IUS), 2009 IEEE International

Conference_Location

Rome

ISSN

1948-5719

Print_ISBN

978-1-4244-4389-5

Electronic_ISBN

1948-5719

Type

conf

DOI

10.1109/ULTSYM.2009.5441549

Filename

5441549