Description of an Infrared Zoomcollimator (Beschrijving van een InfraroodZoomcollimator)

摘要

The performance of thermal imagers is generally tested by means of test targets,put in the focal plane of a collimator. For MRTD measurements, bar targets are used with a certain frequency and variable temperature contrast. The zoomcollimator, described in this report, provides a variable spatial frequency, which is more comparable to the range variation of a target in the terrain with certain size and temperature contrast. In the focal plane also a line source and a circular source with variable temperature contrast can be used, in order to measure the MRTD in an objective way, conform the method developed at TNO-FEL.