At the Novosibirsk State Technical University, NETI, holographic research methods are being brought to a new level, thanks to which it will be possible to determine the degree of possible deformation of industrial products. This will speed up the process of manufacturing products for the space, aircraft, and defense industries.
"The hopes that were pinned on holography in the last century have come to naught because of the high cost of experiments. The method of digital holographic interferometry allows the use of inexpensive devices to record two holograms in real time — before and after deformation and on this basis determine the properties of the object. In fact, we are bringing back the methods that were developed in the 70s and 80s of the last century to a new level. Everything that was made in single copies back then can now be used in production conditions. Take, for example, the testing of an aircraft wing. They are conducted to understand what kind of load the wing can withstand. Holographic interferometry allows you to determine what will happen to an object during loading. In this way, you can check for deformation of anything: fuselage, wings, aircraft landing gear, submarine hull, etc. The series of pre-flight tests of aircraft structures is quite long, it can take up to ten years or even more. The use of this method will significantly reduce this time due to digitalization and the possibility of conducting tests in real time," said Vladimir Guzhov, head of the project "Development of digital Holographic Interferometry methods", Professor of the Department of Data Collection and Processing Systems at NSTU-NETI, Doctor of Technical Sciences.
To determine the deformations of an object using the digital holography method proposed by NSTU-NETI scientists, two series of digital holograms of the object are formed — before and after its loading by the step-by-step phase shift method. Then, mathematical holograms are generated, according to which complex wave fields reflected from the surface of the object are programmatically restored. The deformations are estimated by comparing the wave fields of two different states of the object.
According to Vladimir Guzhov, the advantage of the holographic method is that it is non-contact, i.e. it does not deform the object of study during the measurement process. In addition, the method is highly accurate. Experiments can be conducted in real time, and expensive equipment is not required. This method can be used in the defense, space and aircraft industries.
The project "Development of digital holographic interferometry methods" was included in the list of supported projects following the results of the 2023 competition for grants from the Russian Science Foundation. Grants are allocated to implement fundamental and exploratory scientific research.
