The Department of Defense (DOD) is seeking proposals for the development of an accurate oxygen sensor that can continuously operate in a fuel tank ullage environment with minimal maintenance required. The sensor is intended for use in the On-Board Inert Gas Generator System (OBIGGS) of aircraft fuel tanks, which is used to reduce the risk of fire or explosions. The desired sensor should be able to accurately and continuously measure the oxygen concentration in the fuel tank, maintain a small form factor, and require infrequent maintenance or repairs. It should also be able to withstand the vibration loads and environmental requirements of a typical fighter aircraft flight profile. The project will be conducted in three phases: Phase I involves identifying the mechanism for the oxygen sensor and developing an experimental benchtop design, Phase II focuses on producing an on-aircraft prototype and performing environmental testing, and Phase III involves producing a final design ready for flight test and providing qualification documentation. The technology has potential applications in commercial aircraft fuel tanks and storing commercial flammable liquids. The solicitation is open until February 21, 2024. For more information, visit the solicitation link.