| 摘要 |
A mixed-gas, closed circuit, re-breather diving unit (11), and associated diving system and method, having separate supplies (21, 22) of oxygen and inert gas, arranged to feed a breathing loop (23, 25, 26) in such a manner that, in use, oxygen is fed into the loop (23, 25, 26) as it is consumed by a diver, while inert gas is fed into the loop (23, 25, 26) by a water-pressure-sensitive valve (37) to maintain the loop volume, the unit (11) having oxygen partial pressure (ppO2) monitoring sensors (41) whereby the ppO2 is continuously monitored and maintained at a pre-set level below that of the oxygen toxicity threshold, having a depth gauge diaphragm (43) and having carbon dioxide (CO2) scrubber means (23) within the breathing loop (23, 25, 26), and the pre-set level of the ppO2 can, once the ppO2 monitor has been calibrated initially, be reset instantly to another ppO2 pre-set level prior to a dive, and the carbon dioxide level in the breathing loop (23, 25, 26) can be monitored continuously by optional CO2 level sensors (45), and outputs of the ppO2 and CO2 monitoring sensors and of the depth sensor (46) are transmitted via a telemetry link to a surface-located computer programmed to use such output information, together with time information and dive table data, to produce, in real time, a decomposition schedule.
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