Advanced infrared detector fabrication is the goal of an alliance between Northrop Grumman Corp.'s Electronic Sensors and Systems Sector in Baltimore and Indigo Systems Corp. of Santa Barbara, Calif. The Northrop Grumman Defensive Systems Div. will provide money and engineering assistance at the new Indigo detector operations facility in Goleta, Calif. The facility will manufacture infrared detectors and imaging modules that Northrop Grumman plans to use in electronic products such as targeting and navigation systems and IR countermeasures. Indigo also will use the detectors in its commercial infrared camera products.