Abstract
The article presents the infrared measurement techniques for analyzing and monitoring the dynamic state of the structure using advanced thermal imaging techniques. The article present an overview of the infrared measurement techniques and algorithms proposed research design based on the selected infrared measurement techniques. The article presents the results of a series of studies on the possibility of applying the vibrothermography methods in SHM systems. In particular it focuses on the analysis of the possibility of studying the dynamics of the rotor and the detection of its failures during operation. The results of vibrothermography studies of impeller made of plastic are presented. The results of studies based on algorithms developed by the authors. The article also presents the concept of the use of thermal imaging research in fault detection and monitoring of the dynamic state of real objects.
Highlights
The basic characteristic of a thermal radiation is the temperature emissivity
Conducted research was related to the applicability of active thermography technique in the study and assessment of the rotating machines dynamic state
Based on the results of these studies the following conclusions can be provide: Active thermography can be successfully used in machine and devices diagnosis It is possible to detection and localization of damage that occur on the surface of the object and those occurring in the inner layers of the structures [2,3]
Summary
The basic characteristic of a thermal radiation (electromagnetic radiation emit-ted by the particles which are electrically charged as a result of their thermal mo-tion in the matter) is the temperature emissivity. Emissivity of a body depends on the characteristic parameters of a material such as temperature, chemical composition and physical state of the surface. Methods of active thermography use the phenomenon of abnormal thermal state of the test object through controlled delivery of energy to the object [7]. As the result obtained in this way disturbances of the state of thermal non-uniformity is possible to observe the radiation emitted from the object whose source are damaged areas or defects [4,5]. One method of active thermography is vibrothermography It involves calling the thermal phenomena in the structure of the material of tested objects by forcing a structure by an external delivery system energy in the form of vibration. Where: Cp - specific heat at constant pressure, Km - thermoelasticity factor
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