Coating processes – Measuring – testing – or indicating
Patent
1992-12-16
1994-01-04
Beck, Shrive
Coating processes
Measuring, testing, or indicating
427 74, 427 75, 427 76, 427282, 427287, 4273722, 2502081, 437 3, 437 5, 437 7, 437 8, B05D 512
Patent
active
052758397
ABSTRACT:
A method for sensitizing lead salt infrared detectors includes the step of making a photomask for depositing a lead salt material on a substrate for forming a plurality of detectors in which each detector is electrically coupled in series to at least one other detector on the substrate. A lead salt material, such as lead sulfide or lead selenide, is deposited onto the substrate through the photomask to form a plurality of lead salt detectors connected in series on a substrate. A monitor is connected across a series of interconnecting detectors on the substrate and the substrate is immersed in a heated chemically inert liquid, such as a fluorocarbon liquid, for a predetermined time period to sensitize the lead salt detectors on the substrate while simultaneously monitoring the detectors across the substrate in the heated liquid. The monitor produces an average reading of the resistance for each detector on the substrate to determine when to remove the detectors from the heated liquid. The substrate is then removed from the heated liquid and the separate infrared detectors are separated from each other to form a plurality of lead salt detectors.
REFERENCES:
patent: 2809132 (1957-10-01), Bloem
patent: 2997409 (1961-08-01), McLean
patent: 3178312 (1959-01-01), Johnson
patent: 3356500 (1964-09-01), Autrey
patent: 4682032 (1987-07-01), Barrett
patent: 4689246 (1987-08-01), Barrett
patent: 5138145 (1992-08-01), Nakamura et al.
Beck Shrive
Graseby Electro-Optics, Inc.
Hobby III William M.
Maiorana David M.
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