High-frequency ultrasound array element using thermoelastic expansion in an elastomeric film

Buma, T.; Spisar, M.; O’Donnell, M.
July 2001
Applied Physics Letters;7/23/2001, Vol. 79 Issue 4
Academic Journal
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 over 20 dB using an elastomeric film instead of a more commonly used metallic one. Radiation pattern measurements show that considerable energy is radiated at +/-45° for frequencies beyond 50 MHz. These results show that the thermoelastic effect can be used to produce phased arrays for high-frequency ultrasound imaging. © 2001 American Institute of Physics.


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