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Scanning Vibrometer System (SCN)

The SCN Vibrometer measures the vibration and geometry of radiators, enclosures and mechanical structures used in loudspeakers, micro-speakers, headphones and other electro-acoustical or electro-mechanical transducers.
The SCN Analysis Software performs visualization, animation and a modal analysis of the mechanical vibration using the scanned data which is provided by the vibrometer. The sound pressure output at any point in the half-space sound field and the polar radiation characteristic are predicted by using mechanical data. Novel decomposition techniques show radial and circular modes and vibration components related to the SPL output. It is the target of the analysis to provide a better understanding of the interaction between vibration and radiation.



  • Measure geometry and mechanical vibration of the transducer
  • Visualize the vibration behavior
  • Show contribution to sound pressure output
  • Predict directivity pattern
  • Separate radial and circular modes
  • Analyze actively radiating cone regions
  • Detect loudspeaker defects


Midrange driver with special honeycomb cone structure

At 6kHz there is a significant dip in the on axis sound pressure response. The inner and outer cone region vibrate in phase opposition and the resulting volume flows cancel each other out. The reason is a good bending moment propagation between the inner and outer cone due to the stiff honeycomb membrane, which leads to this distinct vibration mode. 

Optional module: Import / Export Interface


                           *simulated by ABEC

The SCN Import / Export Interface allows importing and exporting scanning data in various data formats. The measured cone geometry is provided in DXF and STL format at high precision. This might be useful for checking the geometrical variations in the quality control and for investigating design choices by performing an FEA using any third-party software. The measured vibration data can also be exported for further analysis with third-party software or imported from external sources for processing with the SCN Analysis Software.

  • Access to high precision geometry acquisition and export
  • Geometry export to DXF and STL file format 
  • Measure speaker parts where no geometry specification is available
  • Check the geometry of prototype loudspeakers
  • Export data for FEM analysis
  • Export data for enhanced sound radiation modeling with BEM analysis
  • Import vibration data from vibration simulation tools


See also Application Note 55 undefinedwith example filesundefined.

Optional module: Rocking Mode Analysis

TV speaker with a critical rocking mode generated by an unknown cause.

The Rocking Mode Analysis (RMA) uses the vibration data of a non-dense scanner measurement and the linear parameters of a loudspeaker driver to perform complete diagnostics on rocking modes. The quality of driver components such a diaphragms, suspension parts, magnetic circuits and other problems in the assembling process are revealed. The module provides information about the energy levels of the rocking modes, the magnitude and direction of the unbalanced forces produced by mass, stiffness and Bl asymmetries. A complete set of modal parameters associated with the transfer resonators between these forces (root causes) and the final tilting energy of the diaphragm (symptoms) is provided.


More Information

Optional module: Radiation Area SD

Radiation Area SD

The Module Radiation Area SD provides an accurate result for the effective radiation area SD, particularly for small drivers and asymmetric driver shapes.

  • Calculate the effective radiation area SD from measured scanning data
  • Perform an averaging of Hx for a selected radius

Optional module: Sound Power / Directivity


The Sound Power Module can calculate the sound power radiation into the half space without requiring a special acoustic room.

  • Calculate the Sound Power Level
  • Decomposition into radial and circumferential vibration components
  • Calculate the Directivity Index DI

Optional module: FEA2SCN

Rayleigh integral via FEA2SCN and Klippel Scanner iCapture

FEA to Scanning Vibrometer System by iCapture


FEA2SCN are modules to link Finite Element Analyses with the Klippel Scanner Analysis (SCN System). 

- Interpolation of data from non-structured FEA-meshes

- Allow acoustic and acceleration decomposition of FEA-results

- Support for 2D and 3D models exploiting possible symmetries

- Include simulation of electromagnetic motor system (T/S parameters) 

- Eliminates unacceptable long computational run-times of 3D non-axisymmetric transducers, passive radiators, loudspeaker cabinets, etc.

FEA2SCN is supported for ANSYS and COMSOL Multiphysics. 

Modules for other FEA-tools can be developed – contact iCapture.

Please find more information in Application Note 66.

Viewer Software and Examples

You can evaluate SCN Analysing Software with examples:

Download the software and example data here:


The SCN Vibrometer comprises the following components:

  • 3D Scanner (3 actuators move the laser in polar coordinates)
  • Motor Control Hardware
  • SCN Analysis Software
  • Cables

Other components required for SCN:


It is recommended to use coating spray for transparent and shiny diaphragms. More information.undefined



Scanning Vibrometer System

The figure above illustrates the vibration and radiation analysis based on distributed mechanical loudspeaker parameters measured by laser scanning to select the optimal transducer and to perform loudspeaker diagnostics.   

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