Title :
A high frequency ultrasound array element using thermoelastic expansion in PDMS
Author :
Buma, T. ; Spisar, M. ; O´Donnell, M.
Author_Institution :
Dept. of Biomed. Eng., Michigan Univ., Ann Arbor, MI, USA
Abstract :
The thermoelastic effect was used to produce high frequency, broadband ultrasound in water. A pulsed diode laser, followed by an erbium doped fiber amplifier, was focused onto a light absorbing film deposited on a glass substrate. Conversion efficiency was improved by 18 dB using a polydimethylsiloxane (PDMS) film instead of a more commonly used metallic one. Radiation pattern measurements show that considerable energy is radiated at +/-45 degrees for frequencies beyond 75 MHz. These results show that the thermoelastic effect can be used to produce phased arrays for high frequency ultrasound imaging
Keywords :
biomedical transducers; biomedical ultrasonics; laser applications in medicine; polymer films; thermal expansion; thermoelasticity; ultrasonic imaging; ultrasonic transducer arrays; 75 MHz; Er doped fiber amplifier; HF broadband ultrasound generation; HF ultrasound imaging; PDMS; high frequency US array element; light absorbing film; medical US imaging; phased arrays; polydimethylsiloxane film; pulsed diode laser; radiation pattern measurements; thermoelastic effect; thermoelastic expansion; Diode lasers; Doped fiber amplifiers; Erbium; Frequency; Optical pulses; Phased arrays; Pulse amplifiers; Pulsed laser deposition; Thermoelasticity; Ultrasonic imaging;
Conference_Titel :
Ultrasonics Symposium, 2001 IEEE
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-7177-1
DOI :
10.1109/ULTSYM.2001.991920
