Ultrasound Transducer Simulation Page
BioSono provides a cyberspace (www.biosono.com) where researchers, engineers, and students can find useful reference and educational materials, conduct acoustic simulation, post questions on design and development, and get answers. The online KLM based transducer acoustic stack simulation, which is currently free, can help you choose piezoelectric, matching and backing material, and a tuning electrical network. The output from the model includes electrical transmit impedance, acoustic receive impedance, and the impulse or pulse-echo response. The ultrasound beam profile simulation provides the calculated transmitted ultrasound pressure field under certain excitation for a given transducer aperture in a number of different geometrical configurations, including circular elements (flat and concave piston), rectangular elements, linear arrays, convex arrays, and 2D arrays. The simulation is based on Field II, which is a free program that utilizes the spatial impulse response method, and has been validated by many researchers for accuracy. In addition to the web based acoustic simulation, we also provide pulse-echo system, transducers, and customized design and develop services.
ultrasound beam simulation longitudinal view
ultrasound beam simulation cross view
Ultrasound Calculation
Concave Piston Aperture Radiation Field: Center Frequency: MHz
Aperture Diameter: mm
Focal Depth: mm

Concave ultrasound transducer is the most typical focused type. The first important concept is the f-number, which equals to the focal depth over the aperture diameter. At focal depth, the beam width at -3dB is the multiplication of f-number and wavelength. To achieve strong focus, or a narrow beam at focal depth, a large aperture size is required at the same frequency. The calculator also gives the depth of focus. The acoustic intensity at focal point is biggest and if use it as a reference, along the depth direction, at the near or far side of the focal point, the acoustic intensity will drop. The depth of focus is defined as the distance between the two points along the depth direction at near and far side of the focal point, where the acoustic intensity drop to -3dB.

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