Current status of closed circuit underwater breathing apparatus.
Closed circuit diving systems are certainly not a new concept, but advanced technology is turning the concept into practical reality.  For years the development of these systems has stagnated in their classified covert operations role, but a new group of sophisticated divers--scientists, photographers and technical divers--has emerged to spur the commercial development of closed circuit underwater breathing apparatus.  The traditional silent and bubble-free capability is being augmented with such additions as microprocessor usage, dependable oxygen sensing, carbon dioxide sensing, and PC integration.
Crosson
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Delta P, Port St Lucie, FL 34985, USA.
Youngblood
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D002245:Carbon Dioxide / Q000032:analysis / Q000378:metabolism; D003201:Computers; D004242:Diving / Q000639:trends*; D004867:Equipment Design; D006804:Ergonomics; D006801:Humans; D008021:Life Support Systems / Q000295:instrumentation*; D010100:Oxygen / Q000032:analysis / Q000378:metabolism; D012119:Respiration / Q000502:physiology; D012984:Software; D018511:Systems Integration
D002245:Carbon Dioxide; D010100:Oxygen