Ultrasound Calculator
Ultrasound Calculation
Frequency, Velocity, and Wavelength
Transducer Acoustic Stack
Transducer RLC Model
Transducer Tuning
Flat Piston Transducer
Concave Piston Transducer
Linear Array
Phased Array
Concave Piston Aperture Radiation Field:
Center Frequency: MHz
Aperture Diameter: mm
Focal Depth: mm
Parameters: F_Number; -3dB Beam Width; Depth of Focus
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.