21OESS Delphi: An Infrared Projection System for Next Generation Weather Satellite Testing

Brandywine has incorporated an infrared scene projector into a portable test system to create a unique platform for optics-in-the-loop testing of space-based imaging systems. This innovation addresses the critical need for a comprehensive and adaptable testing strategy in the design and construction of infrared imaging payloads. Typically, the test apparatus must be adjusted to accommodate comprehensive mission assurance, necessitating multiple test benches to meet diverse testing requirements. Traditional setups for evaluating Noise Equivalent Temperature, Signal-to-Noise Ratio, Ensquared Energy, and Modular Transfer Function involve complex optical bench configurations and expensive equipment, ranging from pinholes with globars to large blackbodies with multiple targets.

Using an infrared scene projector within the Delphi system offers a streamlined solution that simplifies ground testing and validation processes. By employing an infrared emitter array, the Delphi system can project a variety of manipulated scenes directly into the optical system and onto the designated detector. With the availability of projectors across multiple wavelength bands, various infrared systems can be fully evaluated. This consolidated approach allows for the verification of all necessary quality checks within a single optical setup, reducing the need for additional equipment and offering the advantage of full Field of View, flight-like scenes. Additional applications include end-to-end system integrity check, stray light measurement, and training of AI/ML edge computing of atmospheric properties pre-flight.

Furthermore, the Delphi projector is compatible with vacuum environments, making it ideal for systems requiring vacuum conditions during optical testing, such as cooled Long Wave payloads or open detector Dewars. This E-poster will present the setup of the Infrared Projector System, including the types of analysis that can be performed and the range of payloads it can support. Demonstrations of live testing on an infrared detector using the Delphi projector setup, with multiple generated scenes, will showcase its capabilities and compare different methods for testing infrared payloads. We will emphasize the benefits of this projector system, including its ease of use, cost-effectiveness, and adaptability to testing next generation EO/IR weather satellites.