Spacesuit Monitor

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: NAS9-01157
Agency Tracking Number: 012993
Amount: $69,999.00
Phase: Phase I
Program: SBIR
Awards Year: 2002
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
Adherent Technologies, Inc.
9621 Camino del Sol NE, Albuquerque, NM, 87111
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Andrea E. Hoyt
 Polymer Projects Manager
 (505) 346-1685
Business Contact
 Susan Switzer
Title: Business Official
Phone: (505) 346-1685
Research Institution
The concentration of carbon dioxide in exhaled breath is 3.8%; a concentration of 2% causes deepened breathing, and 4% causes a marked increase in respiration. These higher concentrations of CO2 also cause drowsiness and can be unsafe. Therefore, it is desirable to monitor the concentration of CO2 in exhaled breath to guarantee the safety of an astronaut in the dangerous extravehicular environment. This Phase I program proposes the use of a miniaturized SAW sensor array coupled with pattern recognition data analysis for the ambient temperature determination of CO2 in exhaled air. The SAW array systems proposed here are in a 1-cm square package containing a minimum of three SAW devices and an integrated circuit package including all driver and RF circuitry required for sensor operation in a direct DC mode. Multiplex circuitry is currently under development that will allow for the application of up to seven SAW sensors in the array. The final operational system can be equipped with either readout devices or alarms, if immediate notification of an unsafe situation is required. Previous work by the Principal Investigator on a related system has shown that response times are fast, on the order of one second; recovery is complete and equally fast. Accurate determinations in the presence of various interfering compounds are accomplished by means of a pattern recognition algorithm, which allows for the differentiation of signals from several devices to provide characteristic signatures for each of the analytes (or interferents) under consideration.

* information listed above is at the time of submission.

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