title: Characterization of a fiber-optic displacement sensor for measurements in high-intensity focused ultrasound fields.
abstract: A fiber-optic sensor is presented that is capable of measuring the particle displacement in high-intensity focused ultrasound (HIFU) fields. For this probe, a secondary calibration was performed, and the resulting complex frequency response is discussed. As a first practical application, the setup was used to measure the pressure in the field of a weakly focusing ultrasound transducer. The result is compared with that of a membrane hydrophone measurement. The feasibility of measurements in HIFU fields is demonstrated by means of measurements of the spatial distribution of the peak particle velocity within the focus of a HIFU transducer and of the dependence of the peak values on the acoustical power level.
authors.affiliation: Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany. julian.haller@ptb.de
authors.forename: Julian
authors.initials: J
authors.lastname: Haller
authors.forename: Volker
authors.initials: V
authors.lastname: Wilkens
authors.forename: Klaus-Vitold
authors.initials: KV
authors.lastname: Jenderka
authors.forename: Christian
authors.initials: C
authors.lastname: Koch
mesh_terms: D002138:Calibration; D004867:Equipment Design; D005240:Feasibility Studies; D005336:Fiber Optic Technology / Q000295:instrumentation* / Q000592:standards; D057086:High-Intensity Focused Ultrasound Ablation / Q000295:instrumentation* / Q000592:standards; D008422:Materials Testing; D008962:Models, Theoretical; D009038:Motion; D011312:Pressure; D015203:Reproducibility of Results; D012815:Signal Processing, Computer-Assisted; D013016:Sound; D013018:Sound Spectrography; D013997:Time Factors; D014160:Transducers, Pressure / Q000592:standards; D014465:Ultrasonics / Q000295:instrumentation* / Q000592:standards