Improved MRTD model for IR imaging systems

J. G. Vortman; A. Bar-Lev

doi:10.1117/12.951983

1 May 1986 Improved MRTD model for IR imaging systems

J. G. Vortman, A. Bar-Lev

Proceedings Volume 0590, Infrared Technology and Applications; (1986) https://doi.org/10.1117/12.951983
Event: 1985 International Technical Symposium/Europe, 1985, Cannes, France

Abstract

Thermal imaging system performance is described by its Minimum Resolvable Temperature Difference (MRTD), which is the spatial frequency dependent thermal sensitivity. Three different MRTD models are described in this work: two of which are based on the adaptive matched filter concept in order to describe the human eye-brain combination while the Third uses the limited synchronous integrator concept. In all three models the generally used assumptions of periodicity and of one dimensional targets are replaced by two dimensional and more realistic representation of the targets. MRTD expressions are derived for the above mentioned models and the values calculated from them are compared with the Ratches-Lawson model predictions and with measured results for two different systems with known parameters. It is shown that the limited synchronous integrator model results in a more accurate functional dependence ot the MRTD on the spatial frequency. The prediction error commonly found in the low frequency region is reduced and the overall accuracy is enhanced throughout the frequency range of the system in comparison to the Ratches-Lawson model.

Citation Download Citation

J. G. Vortman and A. Bar-Lev "Improved MRTD model for IR imaging systems", Proc. SPIE 0590, Infrared Technology and Applications, (1 May 1986); https://doi.org/10.1117/12.951983

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