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Research |
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Integrated System Health Management (ISHM) will be the key enabling technology for every NASA mission. Among the listed ten challenge areas for the ISHM program in the DUAL-USE CAN, the following five need formalized evaluation, validation and verification mechanism beyond traditional simulation-based or model-based performance analysis: ISHM User Interface, One-Chip Intelligent Sensors, Networking Technologies for Distributed Intelligent Elements, Intelligent Wired/Wireless Sensors, and Smart Sensor Components. However, there is not a single testing environment for upcoming sensor networking standards and challenges with real data and traffic control using well-established networking protocols. We propose to develop a testing environment for the emerging plug-and-play capable sensors in a communication network. This environment will be a testbed for NASA and other industry-related sensor testing, validation, and research. Deliverables: 1—Report of commercially available IEEE 1451 sensors focusing on capabilities: usage of commercial/NASA IEEE 1451 sensors at NASA will be extensively explored and reported. 2—Definition of test programs: Procedures that outline the testing and validation of sensors and sensor systems will be delivered for verification of compliance with standards. a. Smart sensor evaluation tests: metrics of performance at the interfaces with network and the data acquisition sections of the smart sensors as well as sensor reliability monitoring will be delivered for relevant sensors. b. Network traffic evaluation tests: a metric to measure the stochastic nature of delay in a network will be developed. A report on various networking technologies and their scales in the stochastic behavior will be delivered. 3—Implementation of hardware (network, components, processors) to support evaluation/test programs: A testbed with a state-of-the-art networking backbone and various sensor networks that run on various virtual private networks will be delivered. The network will be modular enough to plug in different sensor applications and components to test and validate. 4—Execute evaluation/test programs. a. List of sensors and performance (including NASA prototypes) and recommendations. b. Network configurations/protocols/traffic test results and recommendations. c. Inclusion of selected sensors in SSC smart sensor network. NASA—Stennis Space Center Technical Contact: Dr. Fernando Figueroa (ISHM) co-PIs in this project: Dr. Xiaojing Yuan (ISGRIN), Dr. Driss Benhaddou (WON) Graduate Students: Shivangi Bhatt, Richard Franzl, Haoying Liu, Huiyuan Ma, Anshul Singla |
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NASA, Stennis Space Center, Dual-Use CAN no. NNS06ZBA001C Intelligent Sensor Network Testbed for ISHM |
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Interoperable Smart Sensors & Networking Lab (ISSNet) |
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College of Technology 230D Technology Bldg. Houston TX 77204-4020 |
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Thank you for your participation at the Sensor Applications Symposium 2008: PlugFest with IEEE 1451 compatible implementations!
The participation in the PlugFest focused on IEEE 1451 (1451.1 and others) compatible systems, devices, and networks during the SAS 2008 (http://sensorapps.org/). We would like to work with you (if possible) to further formulate our tests on compatibility of 1451 systems. Criteria on 1451.1 compatibility and plug-and-play: A tester NCAP (TN) and an NCAP under test emulation (NUT) will be provided by the University of Houston (D. Gurkan) in collaboration with NASA-SSC Integrated System Health Management group. The TN will test for state transitions and object properties of any new NCAP on a network. The transport protocols are TCP (for client/server operations) and UDP (for publish/subscribe operations). The medium can be wired (Ethernet). TN will be able to test and also get tested during the Plugfest with various implementations. Implementation of IEEE 1451.1 standard is based on selected operations from an Interface Control Document (ICD v2.1). These operations follow a logical sequence of events from the initial announcement phase to physical data retrieval from NCAP nodes. The operation sequence and test procedure flow diagrams are in Test Procedures: Announcement of NCAP, Retrieval of NCAP model no., manufacturer id, and network visible object properties, Object bindings and activation of NCAP, Set/Get sampling frequency for data, Set/Get update frequency for data, Set/Get one of 3 update methods: client push, server pull, and publish. The packet formats for these operations are from a newer version of the on-the-wire document. More information on the TEST PROCEDURES, ON-THE-WIRE document, and Interface Control Document (ICD). |
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PlugFest | NASA-ISHM | O-CDMA | FBG Sensor | Interoperability | Power Management |
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Optical CDMA Networking with a Code Converter |
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Sound sensing with FBGs has been demonstrated. Two uniform FBGs are used to amplitude modulate output power with wavelength shifts through one FBG. A linear relationship is observed between input and sensed sound tones 10-500Hz.
The spectrum observed at the output of this system as traced from one FBG to the next one illustrates the amplitude modulation of the wavelength change as heart sounds are sensed.
Tests with MediCAN Systems Inc. will be conducted to realize a continuous monitoring system with a medical device connectivity. |
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Optical Fiber Bragg Grating Sensor for Heart Sound Monitoring |
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Centralized code management maintains the code tables for all users. |
