Different Loading Methods

Flexible and Efficient: One sensor system for dynamic, thermal and vacuum loading.


Dynamic Loading

For the dynamic loading the piezoshaker excitation systems are designed by isi-sys. It consists of a Piezoshaker, amplifier and function generator. For a detailled description please refer to the report Products / Piezoshaker Systems „


Piezoshaker frontneu


The Piezoshaker can be attached by vacuum to the object surface.
The HVDA-0-180 amplifier is especially design for isi-sys Piezoshakers and mobile application, where high power at low weight and compact size is a big advantage for mobility and flexible handling. High frequencies up to 100kHz and more as well as large forces and acceleration have been generated in combination with the different isi-sys Piezoshaker modules.




Thermal LoadingThermal loading

isi-sys offers timed thermal loading modules to to heat-up the objects of measurement.

A automated precise control of heat loading and a corresponding timed shearographic measurement is required to achieve a reproducible test procedure for non destructive testing experiments and automated systems.

Any conventional halogen flood lights with 220V can be connected. isi-sys recommends some flood lights used for professional photography. Thus they can be mounted on standard light stand of e. g. Manfrotto etc. and easily directed to the area of interest independent of the sensor head. Also this lights offer some choices of reflector combinations.

The start and duration of the heat loading and the measurements can be set per computer controlled timer, which permits reproducible sequences of the test process.







Vakuum Loading

The vacuum is another loading method for non destructive testing. The modular system concept allows to combine the SE2 sensor with different vacuum loading devices, which reduces system expense and keeps the equipment smart and mobile compared to other solutions .

The vacuum methods can be categorized depending on the loading principle into vacuum chambers/vacuum cabins and vacuum hood/vacuum windows.


Vacuum hood and Vacuum window

Vakuum hoodThe vacuum hood is a modular extension accessories for the SE2 sensor. The sensor will be mounted inside of the hood and therfore the measurement area is covered from sun light influences.

The system has small dimensions and is for this reason very mobile and flexible, additionally the low required vacuum pump power is an advantage.






Vakuum window

If you use the vacuum window, the sensor is outside the vacuum volume. The system is monitoring the object through the window. The bending forces are only across the field of view.

Due to the small volume of the vacuum window hood it can be used in combination with the small isi-vacuum unit (also used for isi-piezoshakers with vacuum cup adapter). The unit includes two separate vacuum pumps, where the second can be used for the vacuum suction cup tripod.



Vacuum chamber and Vacuum cabin

Generally vacuum chambers or cabins have the advantage against vacuum hoods and windows, that the forces appear uniform from all sides on the object. This avoids superposed fringes by global deformation such as by hood, where a bending force on the object surface is superposed, as usually the pressure forces are applied only in one direction on one side of the surface, where the hood is applied.

In both systems the sensor is inside the vacuum volume, which causes pressure loading also on the sensor. The camber and the cabin are bigger than the object and therefore depending on object size the mobility is restricted.


isi-sys offers the newly designed testing vacuum cabin based on aluminium-foam sandwich elements, which is recommended e. g. for frequently manual spot tests or laboratory use.  Samples with a size up to 450 x 750 mm can be measured in this cabin.

Furthermore isi-sys GmbH cooperates with different manufacturer for large vacuum chambers.






SE-Sensors Types

No safety requirements: Laser class 1 with power from 0,1W up to 12W per module

High resolution and sensitivity: 5 MPixel sensor, 10nm light phase reconstruction

High quality and variety of lenses: Designed for professional Nikon-F-mount lenses


SE1 Sensor

SE1 shearography


The SE1 sensor modular system

for automated applications such

as tire testing.







SE2 Sensor



SE2 Sensor with 1W light power by

10 adjustable laser diodes for flexible

laboratory use. The SE2 is the most

flexible and recently new upgraded

design in the SE-sensor family.





SE2 neu array



SE2 Sensor with 12 W laser diode module

for outdoor and large field of view








SE3 Sensor



SE3 Sensor




Software: isi-Studio

isi-Studio is a specialized software tool for automatic and manual controlled operating and recording of (speckle) interferometry.

The work-flow kernel of isi-Studio records the user operations. Its recall and re-do options of any operation sequences offers facilities to control individual research set ups as well as automatic solutions for industry problems. Remote controlled features such as shearing are features in conjunction with the sensor series.

Typical applications of isi-studio are non destructive testing (NDT), vibration analysis, strain and deformation measurements.

Solution Features

Automatic project and work-flow management: each operation step of your measurement or image operation is recorded.


Exposure of speckle interferograms in different acquisition techniques, such as real time phase reconstruction and time average technique with renewed reference frame.




isi-Studio offers various standard filter-types and special filters adapted to discontinuities of phase maps.





isi-Studio contains a robust demodulation or unwrapping algorithm that removes the phase steps and converts the filtered phase map into a continuous plot.

If your phase map is filtered and demodulated, there is the choice to use automatic evaluation of the parameters, such as the wave length of the light source used, saved in the image property sheets during the measurements.


isi-studio4For presentation or analysis of your results, isi-Studio offers tools such as 2D or 3D plots. If you want to include your results into other documents, you have the choice of common input and output image formats (bmp, tiff, jpg, etc.) as well as the compatibility for numerical exchanges to Math-Lab, Excel and other software. Alternative the report generator can be used to create a report document.




An practical example to eplain the the functionality of isi-Studio:x


Phasenrekonstruktion Gefilterte-Phasenaenderung Demodulierte-Phasenverteilung

Recontruction:relative phase change     Filtered phase change                        Demodulated phase distribution

Falschfarbendarstellung-bzw-Quantitaqtiv Integration-Verformungsamplitude Falschfarbendarstellung-Quantitativ

False-colour image                                Integration: deformation amplitude      Quantitative false-colour image