Online Design
Immersion transducers

Circular single element transducers

This page allows to simulate the Focal distance, Lateral resolution and Depth of Field of single element transducers.

This model applies for circular aperture single element transducers, with flat or spherically focused active area.

See on the bottom of this page for more details on each parameter.

Input parameters
Frequency MHz
Active diameter mm
Flat active area (yes/no)
Radius of curvature mm
Medium velocity m/s
Output parameters
Wavelength mm
Near Field mm
Focal distance mm
Beam width (-6dB) mm
Field depth (-6dB) from mm
  to mm


Input parameters

  • Frequency : Operating center frequency of the transducer
  • Active diameter : Active diameter of the transducer
  • Flat active area : Check if the transducer is flat
  • Radius of curvature : Spherical concave radius of curvature of the active surface
  • Medium velocity : Sound velocity in the medium in contact with the transducer

Output parameters

  • Wavelength : Wavelength of the emitted beam
  • Near Field : Near field distance
  • Focal distance : Distance of the maximum of intensity on the beam axis
  • Beam width  : Lateral size (-6dB) of the beam in transmit/receive mode (NA=Non Applicable*)
  • Field depth : Field depth (-6dB) of the beam in transmit receive mode

*For focused transducers, the model for beam width calculation is valid if acoustic focal distance is close to geometric focal distance (radius of curvature). NA is displayed when the result is not applicable.