Selection of the Observation Angle in Thermography Temperature Measurements with the Use of a Macro Lens

Thermography is an effective method of diagnostics of electronic components. In the case of thermography temperature measurements with the use of a macro lens, the thermography temperature measurement error increases with the increase of an observation angle. During thermography temperature measurements with the use of a macro lens of objects with a complex design of the case, it is difficult to control the value of an observation angle. This article presents theoretical considerations regarding angular emissivity and the experimentally obtained relationship between the value of the thermography temperature measurement error with the use of a macro lens and an observation angle. In addition, it presents the designed measuring system.