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  • 1
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    Development and Application of Microfabricated Chemical Gas Sensors For Aerospace Applications (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: Aerospace applications require the development of chemical sensors with capabilities beyond those of commercially available sensors. In particular, factors such as minimal sensor size, weight, and power consumption are particularly important. Development areas which have potential aerospace applications include launch vehicle leak detection, engine health monitoring and control, and fire detection. Sensor development for these applications is based on progress in three types of technology: 1) Micromachining and microfabrication (Microsystem) technology to fabricate miniaturized sensors. 2) The use of nanocrystalline materials to develop sensors with improved stability combined with higher sensitivity. 3) The development of high temperature semiconductors, especially silicon carbide. Sensor development for each application involves its own challenges in the fields of materials science and fabrication technology. This paper discusses the needs of space applications and the point-contact sensor technology being developed to address these needs. Sensors to measure hydrogen, hydrocarbons, nitrogen oxides (Nox, carbon monoxide, oxygen, and carbon dioxide are being developed. A description is given of each sensor type and its present stage of development. Demonstration and application these sensor technologies will be described. The demonstrations range from use of a microsystem based hydrogen sensor on the Shuttle to engine demonstration of a nanocrystalline based sensor for NO, detection. It is concluded that microfabricated sensor technology has significant potential for use in a range of aerospace applications.
    Keywords: Mechanical Engineering
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  • 2
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    Sensors and Rotordynamics Health Management Research for Aircraft Turbine Engines (2011)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: Develop Advanced Sensor Technology and rotordynamic structural diagnostics to address existing Aviation Safety Propulsion Health Management needs as well as proactively begin to address anticipated safety issues for new technologies.
    Keywords: Air Transportation and Safety
    Type: E-661293 , Aviation Safety Program Annual Technical Meeting; May 10, 2011 - May 12, 2011; St. Louis, MO; United States
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  • 3
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    Development of Sic Gas Sensor Systems (2002)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Silicon carbide (SiC) based gas sensors have significant potential to address the gas sensing needs of aerospace applications such as emission monitoring, fuel leak detection, and fire detection. However, in order to reach that potential, a range of technical challenges must be overcome. These challenges go beyond the development of the basic sensor itself and include the need for viable enabling technologies to make a complete gas sensor system: electrical contacts, packaging, and transfer of information from the sensor to the outside world. This paper reviews the status at NASA Glenn Research Center of SiC Schottky diode gas sensor development as well as that of enabling technologies supporting SiC gas sensor system implementation. A vision of a complete high temperature microfabricated SiC gas sensor system is proposed. In the long-term, it is believed that improvements in the SiC semiconductor material itself could have a dramatic effect on the performance of SiC gas sensor systems.
    Keywords: Instrumentation and Photography
    Type: NASA/TM-2002-211707 , E-13455 , NAS 1.15:211707 , 201st Meeting; May 12, 2002 - May 17, 2002; Philadelphia, PA; United States
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  • 4
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    Chemical Gas Sensors for Aeronautics and Space Applications III (1999)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Aeronautic and space applications require the development of chemical sensors with capabilities beyond those of commercially available sensors. Areas of interest include launch vehicle safety monitoring, emission monitoring, and fire detection. This paper discusses the needs of aeronautic and space applications and the point-contact sensor technology being developed to address these needs. The development of these sensors is based on progress in two types of technology: 1) Micromachining and microfabrication technology to fabricate miniaturized sensors. 2) The development of high temperature semiconductors, especially silicon carbide. Sensor development for each application involves its own challenges in the fields of materials science and fabrication technology. The number of dual-use commercial applications of this microfabricated gas sensor technology make this area of sensor development a field of significant interest.
    Keywords: Instrumentation and Photography
    Type: NASA/TM-1999-209450 , NAS 1.15:209450 , E-11943 , Sensors Exposition; Sep 14, 1999 - Sep 16, 1999; Cleveland, OH; United States
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  • 5
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    A Hazardous Gas Detection System for Aerospace and Commercial Applications (1998)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The detection of explosive conditions in aerospace propulsion applications is important for safety and economic reasons. Microfabricated hydrogen, oxygen, and hydrocarbon sensors as well as the accompanying hardware and software are being developed for a range of aerospace safety applications. The development of these sensors is being done using MEMS (Micro ElectroMechanical Systems) based technology and SiC-based semiconductor technology. The hardware and software allows control and interrogation of each sensor head and reduces accompanying cabling through multiplexing. These systems are being applied on the X-33 and on an upcoming STS-95 Shuttle mission. A number of commercial applications are also being pursued. It is concluded that this MEMS-based technology has significant potential to reduce costs and increase safety in a variety of aerospace applications.
    Keywords: Instrumentation and Photography
    Type: NASA/TM-1998-208817 , E-11419 , NAS 1.15:208817 , AIAA Paper 98-3614 , Joint Propulsion; Jul 12, 1998 - Jul 15, 1998; Cleveland, OH; United States
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  • 6
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    A Hazardous Gas Detection System for Aerospace and Commercial Applications (1998)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The detection of explosive conditions in aerospace propulsion applications is important for safety and economic reasons. Microfabricated hydrogen, oxygen, and hydrocarbon sensors as well as the accompanying hardware and software are being, developed for a range of aerospace safety applications. The development of these sensors is being done using MEMS (Micro ElectroMechanical Systems) based technology and SiC-based semiconductor technology. The hardware and software allows control and interrocation of each sensor head and reduces accompanying cabling through multiplexing. These systems are being, applied on the X-33 and on an upcoming STS-95 Shuttle mission. A number of commercial applications are also being pursued. It is concluded that this MEMS-based technology has significant potential to reduce costs and increase safety in a variety of aerospace applications.
    Keywords: Instrumentation and Photography
    Type: NASA/TM-1998-208817 , E-11419 , NAS 1.15:208817 , AIAA Paper 98-3614 , Propulsion; Jul 12, 1998 - Jul 15, 1998; Cleveland, OH; United States
    Format: application/pdf
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  • 7
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    SiC-Based Gas Sensor Development (2000)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Silicon carbide based Schottky diode gas sensors are being developed for applications such as emission measurements and leak detection. The effects of the geometry of the tin oxide film in a Pd/SnO2/SiC structure will be discussed as well as improvements in packaging SiC-based sensors. It is concluded that there is considerable versatility in the formation of SiC-based Schottky diode gas sensing structures which will potentially allow the fabrication of a SiC-based gas sensor array for a variety of gases and temperatures.
    Keywords: Instrumentation and Photography
    Type: NASA/TM-2000-209653 , E-12009 , NAS 1.15:209653 , Silicon Carbide and Related Materials; Oct 10, 1999 - Oct 15, 1999; Raleigh, NC; United States
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  • 8
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    Microfabricated Chemical Sensors for Safety and Emission Control Applications (1998)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Chemical sensor technology is being developed for leak detection, emission monitoring, and fire safety applications. The development of these sensors is based on progress in two types of technology: 1) Micromachining and microfabrication (MicroElectroMechanical Systems (MEMS)-based) technology to fabricate miniaturized sensors. 2) The development of high temperature semiconductors, especially silicon carbide. Using these technologies, sensors to measure hydrogen, hydrocarbons, nitrogen oxides, carbon monoxide, oxygen, and carbon dioxide are being developed. A description is given of each sensor type and its present stage of development. It is concluded that microfabricated sensor technology has significant potential for use in a range of aerospace applications.
    Keywords: Instrumentation and Photography
    Type: NASA/TM-1998-208816 , E-11418 , NAS 1.15: 208816 , Digital Avionics Systems; Oct 31, 1998 - Nov 06, 1998; Bellevue, WA; United States
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  • 9
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    Miniaturized Amperometric Solid Electrolyte Carbon Dioxide Sensors (2006)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A miniaturized electrochemical carbon dioxide (CO2) sensor using Na3Z r2Si2PO12 (NASICON) as a solid electrolyte has been fabricated and de monstrated. Microfabrication techniques were used for sensor fabricat ion to yield a sensing area around 1.0 mm x 1.1 mm. The NASICON solid electrolyte and the Na2CO3/BaCO3 (1:1.7 molar ratio) auxiliary elect rolyte were deposited by sputtering in between and on top of the inte rdigitated finger-shaped platinum electrodes. This structure maximize s the length of the three-phase boundary (electrode, solid electrolyt e, and auxiliary electrolyte), which is critical for gas sensing. The robust CO2 sensor operated up to 600 C in an amperometric mode and a ttempts were made to optimize sensor operating parameters. Concentrat ions of CO2 between 0.02% and 4% were detected and the overall sensor performance was evaluated. Linear response of sensor current output to ln[CO2 concentration] ranging from 0.02% to 1% was achieved.
    Keywords: Instrumentation and Photography
    Type: E-16987 , 210th Meeting of The Electrochemical Society; Oct 29, 2006 - Nov 03, 2006; Cancun; Mexico
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