title: A measurement system for continuous wave ultrasound fields.
abstract: A measurement system for evaluating ultrasound fields is presented. The system utilizes a PVDF hydrophone and a mechanical scanning device. For continuous wave (CW) ultrasound, a high sensitivity is achieved by using a narrow band technique. The high sensitivity is demonstrated in a recording of the beam profile from an air transducer. Recordings from fetal Doppler equipment shows that, due to interference between the multiple transmitters, a high spatial resolution is needed in the field measurements in order to obtain correct values for peak intensities.
authors.affiliation: Department of Electrical Measurements, Lund Institute of Technology, Sweden.
authors.forename: H W
authors.initials: HW
authors.lastname: Persson
authors.forename: S O
authors.initials: SO
authors.lastname: Dymling
authors.forename: N G
authors.initials: NG
authors.lastname: Holmer
mesh_terms: D005260:Female; D006801:Humans; D011247:Pregnancy; D012680:Sensitivity and Specificity; D014159:Transducers; D014465:Ultrasonics; D016216:Ultrasonography, Prenatal / Q000295:instrumentation*