| タイトル | Laser Spectroscopy Based Multi-Gas Monitor Technology Demonstration |
| 本文（外部サイト） | http://hdl.handle.net/2060/20160003890 |
| 著者（英） | Pilgrim, Jeffrey S.; Mudgett, Paul D. |
| 著者所属（英） | NASA Johnson Space Center |
| 発行日 | 2016-07-12 |
| 言語 | eng |
| 内容記述 | The timing was right in the evolution of low power tunable diode laser spectroscopy (TDLS) to design a spacecraft cabin air monitor around technology being developed at a small company funded by SBIR grants. NASA Centers had been monitoring their progress hoping that certain key gaps in the long term gas monitoring development roadmap could be filled by TDLS. The first iteration of a monitor for multiple gases called the Multi-Gas Monitor (MGM) which measures oxygen, carbon dioxide, ammonia and water vapor, as well as temperature and pressure. In January 2013, the ISS Program being particularly interested in ammonia funded a technology demonstration of MGM. The project was a joint effort between Vista Photonics for the sensor, NASA-JSC for project management and laboratory calibration, and Nanoracks for the enclosure and payload certification/integration. Nanoracks was selected in order to use their new experimental infrastructure located in an EXPRESS rack in the JEM. The MGM enclosure has multiple power supply options including 5VDC USB interface to the Nanoracks Frame, 28VDC Express Rack power and internal rechargeable batteries. MGM was calibrated at NASA-JSC in July 2013, delivered to ISS on 37 Soyuz in November 2013 and was installed and activated in February 2014. MGM resided in the Nanoracks Frame making continuous measurements the majority of the time, but also spent a day in Node 3 on battery power, and a month in the US Lab Module on 28VDC power, as part of the demonstration. Data was downloaded via Nanoracks on roughly a weekly basis. Comparisons were made with data from the Major Constituents Analyzer (MCA) which draws and analyzes air from JEM and other modules several times per hour. A crewmember challenged the carbon dioxide channel by breathing into the intake upon startup, and challenged the ammonia channel later using a commercial ammonia inhalant. Many interesting phenomena in the cabin atmosphere were detected during the tech demo including weekly JEM heat exchanger dry out cycles reflected as regular peaks in the water data, high carbon dioxide activity from the gas thrusters of the SPHERES payload operating in JEM, carbon dioxide and humidity spikes from Carbon Dioxide Removal Assembly (CDRA) operation in the US Lab, nitrogen and oxygen represses from supply tanks, and pressure step changes from airlock activities. Results obtained to date show the MGM tracks the MCA oxygen and carbon dioxide data very well, with no drift or degradation of laser power or other sensor related component (rock solid calibration). See photo/data montage on second page. Work has begun on additional gas monitors based on MGMs core sensor technology including a stand-alone ammonia monitor and a combustion product monitor both for Orion and to replace dated emergency response instrumentation on ISS. |
| NASA分類 | Man/System Technology and Life Support |
| レポートNO | JSC-CN-35574 |
| 権利 | Copyright, Distribution as joint owner in the copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/562120 |
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