Analysis for MRTD and DMRTD based on contrast simulation

Lingfeng Chen; Xusheng Zhang; Taogeng Zhou; Jiaming Lin

doi:10.1117/12.790859

3 March 2008 Analysis for MRTD and DMRTD based on contrast simulation

Lingfeng Chen, Xusheng Zhang, Taogeng Zhou, Jiaming Lin

Proceedings Volume 6621, International Symposium on Photoelectronic Detection and Imaging 2007: Photoelectronic Imaging and Detection; 66211M (2008) https://doi.org/10.1117/12.790859
Event: International Symposium on Photoelectronic Detection and Imaging: Technology and Applications 2007, 2007, Beijing, China

Abstract

Due to the phasing effects, the measurements of Minimum Resolvable Temperature Difference (MRTD) for Staring array thermal imagers often get abnormal results when the targets approaching system Nyquist frequency (f_n). To simulate the relations between MRTD values and four-bar targets' frequencies, this paper introduces the concept of best contrast. Clearly, the MRTD results are inversely proportional to the best contrasts under optimum phases, higher contrast corresponding to a lower MRTD. On the other hand, with the spatial frequencies increasing, the target's opening area shrinking and leads the effective infrared eradiation decreasing, this means the MRTD results are inversely proportional to the opening area of the target. Based on these two assumptions, and through numerical simulations, this paper depicts the tendency chart of MRTD under optimum phases to the four-bar targets' spatial frequencies. The tendency chart adequately explains the hump curve happens at frequencies between 0.6f_n and f_n. From the simulations, the maximum of MRTD values can be predicted at the frequency of 0.89f_n. The tendency chart illustrated by numerical simulation is consistent with the MRTD results get in laboratory. While in Dynamic Minimum Resolvable Temperature Difference (DMRTD) testing, moving the four-bar targets introduces temporal effects not present in static MRTD test. Simulation reveals that DMRTD test can get more realistic shape of the curve between 0.6f_n and f_n, the characteristic hump in the static MRTD curve between 0.6f_n and f_n is not seen.

Citation Download Citation

Lingfeng Chen, Xusheng Zhang, Taogeng Zhou, and Jiaming Lin "Analysis for MRTD and DMRTD based on contrast simulation", Proc. SPIE 6621, International Symposium on Photoelectronic Detection and Imaging 2007: Photoelectronic Imaging and Detection, 66211M (3 March 2008); https://doi.org/10.1117/12.790859

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KEYWORDS

Minimum resolvable temperature difference

Optical simulations

Sensors

Spatial frequencies

Numerical simulations

Staring arrays

Thermography

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