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Optical Signature Modeling of Transmissive Materials



TECHNOLOGY AREA(S): Electronics, Sensors, Space Platforms

The technology within this topic is restricted under the International Traffic in Arms Regulation (ITAR), which controls the export and import of defense-related material and services. Offerors must disclose any proposed use of foreign nationals, their country of origin, and what tasks each would accomplish in the statement of work in accordance with section 5.4.c.(8) of the solicitation.

OBJECTIVE: This effort seeks to develop computational modeling methodologies that can achieve better accuracy than currently available and develop optical property measurement techniques that provide accurate measurement of the properties desired by computational modeling methodologies.

DESCRIPTION: Seek innovations leading to improved modeling of visible and infrared signatures for objects with partially transmissive surfaces. In particular, this effort seeks to develop a methodology to model the surface and inner component temperatures, transmissive behavior, emission and reflective behavior associated with partially transmissive material surfaces under arbitrary environmental conditions (e.g., solar, earth, and albedo irradiation) with arbitrary material properties. Accuracy and computational efficiency is also important in the methodology development since the methodology must be integrated into a broader scope engineering analysis code. Techniques are needed for high fidelity modeling of the thermal and optical interaction between multiple object components, including radiative wavelength-dependent heat transfer between multiple arbitrary transmissive and opaque materials, and resulting time-dependent temperature distributions. Techniques are also needed for high fidelity wavelength-dependent optical emission, reflection and transmission for an entire object, including both transmissive and opaque materials. Eventually, compatibility with government industry standard codes (e.g., OSC, OPTISIG) is essential. Additionally, the transmissive material’s thermophysical and optical properties can vary as a function of temperature and optical properties can vary as a function of incident angle and wavelength. This effort also seeks to develop techniques for the accurate measurement of optical properties of partially transmissive materials.

PHASE I: Develop viable concepts for computational methodologies and/or measurement techniques associated with partially transmissive materials. Perform trade-offs between model fidelity, computer run-time, compatibility with government industry standard codes, and desired material properties data. Determine a resulting preferred approach for developing a high-fidelity transmissive material thermal and optical signature prediction capability.

PHASE II: Fully develop and demonstrate the modeling capability and/or measurement techniques on materials of interest. Integrate the methodology into current government engineering analysis tools and simulations. Provide a measure of accuracy and computational efficiency related to area of interest to the government. Validate models by comparison to available ground and/or flight test temperature and signature data. In the case of optical property measurement techniques, fully develop and build the setup desired to provide accurate optical property measurements for partially transmissive materials. Perform measurements on materials of interest with accuracy bounds. This phase will include validation against measured data sets.

PHASE III DUAL USE APPLICATIONS: Expand the transmissive measurements and modeling capabilities from Phase II and fully integrate them into OSC at a minimum (OPTISIG, if possible). Develop approaches for speeding up the run time by mapping to multiple CPU or GPUs to facilitate faster Monte Carlo simulations and/or to allow for real-time operation.


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KEYWORDS: transmissive materials, OSC, optical signatures, modeling


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