Speckle Interferometry by isi-sys
isi-Studio is a specialized software tool for automatic and manual controlled operating and recording of (speckle) interferometry.
The workflow kernel of isi-Studio records the user operations. Its recall and re-do options of any operation sequences offer facilities to control individual research setups as well as automatic solutions for industry problems. Remote controlled gain and shearing are features in conjunction with the sensors.
Typical applications are in-plane and out-of-plane strain and deformation measurements, vibration analysis, and non-destructive testing.
Non-Destructive Testing
Non-destructive testing is the most common use of shearography. The defects become visible by measuring their inhomogeneous deformation gradients. Depending on the spatial distribution of deformation the defect or the structure itself can be characterized. The example to the right shows the non-destructive testing of a rotor. The measurements show a dis-bond (left), a structural transition (center), and a crack (right).
Solution Features
Automatic project and workflow management: each operation step of your measurement or image operation is recorded and can be repeated with recall and redo functions or manipulated parameters.
Exposure of speckle interferograms in different acquisition techniques. This is for example the 3×3 or 4×4 phase step techniques, as well as the real-time and the time average technique with the renewed reference frame.
Automatic measuring routines for in-plane and out-of-plane holography as well as in-plane and out-of-plane shearography. In combination with the strainograph or/and the laser-diode units or liquid crystal shutters, there is the option to extend the hardware to automated 3D deformation and strain analysis system.
isi-Studio offers various standard filter types and special filters adapted to discontinuities of phase maps using state-of-the-art sin/cos-transformation. A new feature of isi-Studio is the fast fourier transformation (FFT) of interferograms including FFT Filtering and FFT evaluation of the interference phase. An outstanding function of isi-Studio is the automatic sign correction after FFT phase evaluation.
isi-Studio proposes an easy handling tool for masking your images with circles, rectangles, and polygons as well as inverting these functions to cut parts of the image which contain any irregularities and the parts of interest.
isi-Studio contains a standard 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 wavelength of the light source used, saved in the image property sheets during the measurements.
For the presentation or analysis of your results, isi-Studio offers tools such as 2D or 3D plots. If you want to include your results in 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.
The software includes a self-calibration function for the piezo-drive that automatically adapts to the phase shift steps to your laser wavelength. Automatic shearing adjustment and control are performed with the shear control unit with or without DMS feedback-controlled piezo mechanical stabilization in the nanometer range. This can be also applied to the stabilization of position-sensitive arrangements
