Document Detail

Solid-state electrolyte sensors for rebreather applications: a preliminary investigation.
MedLine Citation:
PMID:  21848112     Owner:  NLM     Status:  In-Process    
INTRODUCTION: Recently developed prototypes of zirconium dioxide and NASICON-based micro solid-state electrolyte oxygen (O2) and carbon dioxide (CO2) sensors were tested for their potential suitability in rebreathers. The O2 sensor has a quasi-indefinite lifetime, whilst that of the CO2 sensor is approximately 700 h. This is a preliminary report of a new technological application.
METHODS: The O2 sensor was tested in a small pressure chamber to a partial pressure of oxygen (PO2) of 405 kPa (4 bar). The CO2 sensor was tested up to 10 kPa CO2. The response times to a step change of pressure were measured, and cross-sensitivity for helium tested using trimix. A rebreather mouthpiece was modified so that breath-by-breath gas recordings could be observed. Power consumption to heat the sensors was measured.
RESULTS: The O2 sensor demonstrated non-linearity, particularly above 101.3 kPa (1 bar) PO2, whereas the output of the CO2 sensor showed an inverse logarithmic relationship. Cross-sensitivity to helium was observed. The mean t90 response times were 90 (SD 10) ms for the O2 sensor, and 100 (SD 10) ms for the CO2 sensor. Breath-by-breath recordings showed slight damping of the CO2 trace due to electronic filtering. Power consumption was 1.5-2 W per sensor.
CONCLUSIONS: The fast response times would allow accurate breath-by-breath measurement. Even though the O2 sensor has a non-linear response, measurement is possible using multi-point calibration. Further design is necessary to allow trimix to be used as the diluent. A major disadvantage is the high power consumption needed to heat the sensors to high temperatures.
Arne Sieber; Rainer Baumann; Stefanos Fasoulas; Anatol Krozer
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Diving and hyperbaric medicine : the journal of the South Pacific Underwater Medicine Society     Volume:  41     ISSN:  1833-3516     ISO Abbreviation:  Diving Hyperb Med     Publication Date:  2011 Jun 
Date Detail:
Created Date:  2011-08-18     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101282742     Medline TA:  Diving Hyperb Med     Country:  Australia    
Other Details:
Languages:  eng     Pagination:  90-6     Citation Subset:  IM    
IMEGO AB, Göteborg, Sweden.
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