Development of a calibration resource for non-contact dynamic temperature measurement

Purpose and goal

In several industrial processes it is important that temperature measurements are not only accurate but also fast enough to capture dynamic events. The aim of this project has therefore been to develop a calibration method for verifying that radiation thermometers can measure fast temperature changes. A system has been set up that can generate a fast-changing temperature, record the signal from the measurement equipment and generate a response curve.

Expected results and effects

Simulations show how the signal of an ideal pyrometer behaves when the temperature is varied using an optical chopper. This result correlates well with the signal from a fast pyrometer acquired during tests with the developed system. It is also possible to make a frequency sweep and automatically generate a response curve. Trials with a relatively slow pyrometer gave results that compares well with values given by the manufacturer. With the developed equipment it will be possible to test pyrometers and thermal cameras from industry and validate that they meet requirements.

Planned approach and implementation

Several methods for generating fast temperature changes were evaluated in a literature study. An optical chopper was chosen and analytical and numerical calculations were made to examine the behavior. The system was then set up and evaluated using one fast and one slow pyrometer. A program was made to control everything, including the speed of the chopper, to present data from the measurement equipment and to generate a response curve based on the amplitude of the measured signal.