Development of dynamic temperature reference based on semiconductor source

Important results from the project

The goal of the project was to develop a way to verify that thermal cameras and pyrometers can measure the correct temperature during very fast dynamic changes by using pulsed LEDs instead of a conventional black body. A system was set up where the light source was an array of LEDs in a diffuser, which was controlled by a signal generator in combination with an LED driver. The equipment behaved as in previously performed simulations and could be used to examine the response time of a reference pyrometer.

Expected long term effects

A system has been developed to investigate the dynamic response of pyrometers to rapid temperature changes. It has been tested against a reference pyrometer with good results. It is possible to calibrate customer objects, although it turned out that there were some limitations in the possible wavelength range and pulse frequency. Parts of the equipment will also be used to characterize a pyrometer as part of an EPM project. The results of the project have also given the group an increased understanding of using LED sources as references and the opportunities and difficulties they entail.

Approach and implementation

First, what a possible equipment could look like was investigated and suppliers of critical components, in the form of LEDs in the right wavelength range and frequency-controlled LED drivers, were identified. Based on the selected equipment, simulations were made to investigate how many LEDs were needed and to design a diffuser capable of providing uniform radiation from multiple light sources with low losses. The selected equipment was procured and manufactured and the completed system was then tested against a reference pyrometer, showing that it behaved as expected.

External links

Extern projektsida under ri.se