Correction of signals in a microbolometric array raising the validity of the measuring object's temperature. Part 1

Noncontact methods of imaging temperature fi elds, based on the registration of thermal radiation, are widely used in the study and control of thermal processes in different branches of human activities. To reduce uncertainty in measuring temperature with digital infrared imaging equipment, it is necessary to take into account a number of factors causing deviation of its readings from true values. In the paper, analysis is made of physical processes occurring in registration of thermal radiation by thermographs on the basis of microbolometric arrays and methods are proposed for correcting registered signals that make it possible to reduce uncertainty in measuring temperature using them. The fi rst part of the paper is devoted to considering the design of LWIR-range microbolometric arrays and the required corrections of registered signals making it possible to correctly interpret the obtained thermal images in a broad range of measured temperatures. The second part of the paper is devoted to algorithms of processing produced thermal imaging signals, and also to methods of accounting for the coeffi cient of thermal radiation of controlled surfaces and for the environmental radiation refl ected from them whose use makes it possible to improve the validity of temperature determination
Noncontact methods of imaging temperature fi elds, based on the registration of thermal radiation, are widely used in the study and control of thermal processes in different branches of human activities. To reduce uncertainty in measuring temperature with digital infrared imaging equipment, it is necessary to take into account a number of factors causing deviation of its readings from true values. In the paper, analysis is made of physical processes occurring in registration of thermal radiation by thermographs on the basis of microbolometric arrays and methods are proposed for correcting registered signals that make it possible to reduce uncertainty in measuring temperature using them. The fi rst part of the paper is devoted to considering the design of LWIR-range microbolometric arrays and the required corrections of registered signals making it possible to correctly interpret the obtained thermal images in a broad range of measured temperatures. The second part of the paper is devoted to algorithms of processing produced thermal imaging signals, and also to methods of accounting for the coeffi cient of thermal radiation of controlled surfaces and for the environmental radiation refl ected from them whose use makes it possible to improve the validity of temperature determination
Author:  V. A. Firago
Keywords:  thermal radiation, temperature fi elds, correction of thermal imaging signals, validity of temperature-fi eld measurement
Page:  272-285