Title :
A laseroptic hydrophone for high energy ultrasound
Author :
Huber, P. ; Debus, J. ; Lorenz, A. ; Hahn, E.W. ; Peschke, P. ; Lorenz, W.J.
Author_Institution :
German Cancer Res. Center, Heidelberg, Germany
Abstract :
To know more precisely how pulsed high energy ultrasound (PHEUS) interacts with tissues one must define the acoustical dose. Establishing such an acoustical dose requires exact measurement of the ultrasonic wave with amplitudes up to 100 MPa and its associated phenomena like acoustic cavitation. Therefore a laseroptic hydrophone has been designed and built. The principle of the design is to couple the light of a laser diode into a fiber of quartz glass and to detect the wave induced variation of the refractive index in the medium at the end of the fiber. The sensitivity of the pressure gauge is 1.1 mV/MPa with a bandwidth of 10 MHz. Moreover, the rise and duration of cavitation bubbles which are dependent on the energy of the ultrasonic wave can be detected with the 50/125 μm fiber
Keywords :
biomedical equipment; biomedical ultrasonics; hydrophones; laser applications in medicine; radiation therapy; 10 MHz; 100 MPa; 125 micron; 50 micron; US-tissue interaction; acoustical dose; cavitation bubbles; laser diode; laseroptic hydrophone; medical therapeutic US; pressure gauge sensitivity; pulsed high energy ultrasound; quartz glass fiber; refractive index variation; shock wave lithotripsy; Acoustic measurements; Acoustic pulses; Acoustic waves; Diode lasers; Fiber lasers; Optical coupling; Optical design; Sonar equipment; Ultrasonic imaging; Ultrasonic variables measurement;
Conference_Titel :
Ultrasonics Symposium, 1991. Proceedings., IEEE 1991
Conference_Location :
Orlando, FL
DOI :
10.1109/ULTSYM.1991.234296
