Monte Carlo tolerancing shell for FLIR92

Howard V. Kennedy

doi:10.1117/12.210072

22 May 1995 Monte Carlo tolerancing shell for FLIR92

Howard V. Kennedy

Proceedings Volume 2470, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing VI; (1995) https://doi.org/10.1117/12.210072
Event: SPIE's 1995 Symposium on OE/Aerospace Sensing and Dual Use Photonics, 1995, Orlando, FL, United States

Abstract

A program named `MRTTOL' has been devised to help in evaluating the performance of forward looking infrared (FLIR) systems in the presence of tolerances. It is essentially a shell program to execute the NVESD analysis program `FLIR92' multiple times with randomly varied input parameters, then calculate statistics on the minimum resolvable temperature difference (MRTD) predictions of FLIR92. The input to FLIR92 is a template-style data file in which the data must be in a certain sequence within each of a set of data blocks. This lends itself well to setting up a file of tolerances with a one-to-one correspondence with each of the datum inputs. The MRTTOL program expects just this correspondence between a `nominal' data file and a `tolerance' file giving the expected variations on each of the datum in the `nominal' file. The program interprets each tolerance as being the 2-sigma variation of the associated datum in the nominal file. It repeatedly sets up a perturbed data set by randomly varying each input value, runs FLIR92 with the perturbed data set, and accumulates the horizontal, vertical, and 2-D MRTD values in an output file. After running whatever number of perturbed data sets the user calls for, the program calculates the mean and standard deviation of the MRTD at each of 20 equally spaced spatial frequencies (increment set by the user). The output lists the expected values of MRTD for cumulative probabilities at several percentages from 50% to 3-sigma.

Citation Download Citation

Howard V. Kennedy "Monte Carlo tolerancing shell for FLIR92", Proc. SPIE 2470, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing VI, (22 May 1995); https://doi.org/10.1117/12.210072

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KEYWORDS

Tolerancing

Minimum resolvable temperature difference

Spatial frequencies

Statistical analysis

Control systems

Forward looking infrared

Sensors

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