PO2 Sensor Signal Validation for ECCRs |
In electronically controlled, closed-circuit rebreather diving systems, the partial pressure of oxygen inside the breathing loop is controlled with three oxygen sensors, a microcontroller and a solenoid valve, critical components that may fail. State-of-the-art detection of sensor failure, based on a voting algorithm, may fail under circumstances where two or more sensors show the same but incorrect values. We developed a novel rebreather controller that offers true sensor-signal validation, thus allowing efficient and reliable sensor failure detection. The core components of this validation system are two additional solenoids, which allow an injection of oxygen or diluent gas directly across the sensor membrane.
The developed true sensor signal validation is now commercially exploited in the Poseidon/Cis Lunar Discovery MK6 rebreather (www.poseidon.com).
References: Wourld Intellectual Property Organisation - METHOD FOR OPERATING A REBREATHER (WO/2008/080948) Sieber A, L' Abbate A, Bedini R. Oxygen sensor signal validation for the safety of the rebreather diver. Diving and Hyperbaric Medicine. 2008; 39(1): 38-45. Sieber A, Jones N, Stone B, Pyle R, Koss B, Sjoblom K. Embedded systems in the Poseidon MK6 rebreather. Proceedings of the Seventh Workshop on Intelligent Solutions in Embedded Systems. 2009: 37-42 (get the paper here).
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