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The Electronic Nose and The Quadrupole Mass Spectrometer Array

The Electronic Nose and The Quadrupole Mass Spectrometer Array

By: Dan Karmon, Ph.D

Project Manager - QMSA

SSET Avionics/ATTI Avionics Lead Avionics Equipment Section 344

Jet Propulsion Laboratory

 The Electronic Nose (E-Nose) was developed jointly by Jet Propulsion Laboratory (JPL) and the California Institute of Technology (CalTech). In many ways it mimics the human nose and is designed to monitor changes in an atmosphere to which it is exposed. It is based on the multi-sensing principle in which the distributed response of an array is used to identify the constituents of a gaseous environment. Individual sensor films are not specific to any one gas. It is in the use of an array of different sensor films that gases and gas mixtures can be uniquely identified by the pattern of measured electrical response.

 The E-Nose was successfully flown on STS-95 space shuttle mission (October 1998). It monitored the middeck air continually for over six days and took data samples every 3 seconds. Following analysis and comparison with other independent data, the experiment was judged to be very successful.

 It was clear from the beginning that we would need a small computer to run and control the E-Nose experiment. We chose the HP 200LX palmtop as an available and inexpensive solution. The HP 200LX was used "as is" secured to the cover of the E-Nose box (See picture). We only needed one modification. We had to make the Palmtop start up without any batteries. This made it easier to pass the stringent shuttle safety requirements. (The experiment was operated by the Shuttle 28Vdc.) A 2 MB HP 200LX was used along with a 6 MB flash card for safe data storage. The operational software, programmed in Quick Basic 45 with additional C Libraries, was also stored on the flash memory and "moved" to RAM upon power-up. This memory configuration would have been sufficient for a 15-day Space Shuttle mission. The 200LX controlled the experiment (pneumatic system, miniature pump, solenoid valve, and sensor heaters) and executed the normal health checks and safety monitoring. Additionally, since the E-Nose requires highly accurate measurement of resistance changes, it was placed in the measurement and error nulling loop of the sensor measurement electronics. The 200LX controlled the interrogation of the sensors at a known time interval, registered critical measurements, nulled outputs as needed, calibrated as needed, registered results, registered the time, did some of the calculations, and stored a series of parameters. The final data analysis was done after the flight, in the lab.

 The Quadrupole Mass Spectrometer Array (QMSA): The QMSA was developed at the Jet Propulsion Laboratory (JPL). It is to be integrated into a portable tool (TGA-Trace Gas Analyzer) for use by astronauts on the International Space Station (ISS). The QMSA is a highly sensitive sensor and was designed and tested to identify and quantify constituents up to 150 amu. (atomic mass units). Its primary ISS mission will be for detection and quantification of nitrogen, oxygen, ammonia, and hydrazines. It is slated for first flight in early 2001.

 Preliminary design indicated that we can leverage the experience gained on the E-Nose (See above) and apply the HP 200LX to the QMSA. In this case, however, using the 200LX "as is" was not an option. Only the 200LX circuit board will be utilized (See pictures). As in the E-Nose, the 200LX Palmtop batteries are not used. Additionally, the 200LX display signals were re-routed to a space qualified display system as required for astronaut use in space. Memory configuration was the same as the E-Nose. The 200LX was programmed in MS C 5.1 with some Lab Window libraries.

 Quadrupole Mass Spectrometer Array (QMSA) Exploded View showing HP 200LX motherboard

 This instrument is more complex that the E-Nose. The TGA requires an operator interface (switches, display, indicators, etc.), tool control, sensor control, and real time display of data. The 200LX handles all the TGA operations including safety interlocks, power-up, and calibration. Based on operator's selection of menu driven mode of operation the 200LX controls the sensor sequences, the data collection, the calculations, and data handling. The 200LX will store the data and send appropriate information to the new display.

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