David Potter
National Instruments
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Featured researches published by David Potter.
autotestcon | 2002
David Potter
With the goal of promoting the development and adoption of smart transducers, the IEEE 1451 family of smart sensor interface standards defines a set of standardized interfaces for different categories of smart sensors and smart actuators. One member of this family, the IEEE P1451.4 standard, defines a mixed-mode interface that combines that traditional analog sensor signal with a digital interface that enables self-identification of the sensor for plug and play operation. This self-identification is provided by a transducer electronic data sheet (TEDS) that is stored within the transducer. In addition to explaining the components and mechanisms of IEEE P1451.4, the paper describes the implication of plug and play sensors for test and measurement systems. The paper also documents an example implementation of a computer-based data acquisition system that exploits the plug and play sensor concept.
Proceedings of SPIE | 2011
Jeremiah Fasl; Vasilis Samaras; Matthew Reichenbach; Todd Helwig; Sharon L. Wood; David Potter; Richard Lindenberg; Karl H. Frank
This paper provides a summary of ongoing research sponsored by the National Institute of Standards and Technology (NIST) that seeks to improve inspection practices for steel bridges by providing the technology and methodology for real-time monitoring. In order to reduce the time and cost of installing a monitoring system, the research team elected to use wireless communications within the sensor network. The investigation considered both IEEE 802.11 and IEEE 802.15.4 communications protocols and identified the latter as more practical for bridge monitoring applications. Studies were conducted to investigate possible improvements in the network performance using high-gain antennas. Results from experiments conducted outside and on bridges with different antennas are presented in this paper. Although some benefits were observed using high-gain antennas, the inconsistent performance and higher cost relative to the current stock, omni-directional antennas does not justify their use.
Transportation Research Record | 2010
Jeremiah Fasl; Todd Helwig; Sharon L. Wood; Vasilis Samaras; David Potter; Richard Lindenberg; Karl H. Frank
Highway bridges are vital links in the U.S. transportation network, providing the public with routes for daily commutes and businesses with the infrastructure needed to supply goods and services. Identifying possible safety problems in the approximately 600,000 bridges across the country generally is accomplished through labor-intensive visual inspections. The National Bridge Inspection Program requires that bridges be inspected at least once every 2 years. Pending legislation spurred by the collapse of the I-35W steel truss bridge in Minneapolis, Minnesota, would increase the inspections for fracture-critical bridges to once a year and likely strain department of transportation resources that are already stretched to the limit. This paper outlines ongoing research sponsored by the National Institute of Standards and Technology that seeks to improve inspection practices by providing the technology and methodology for real-time monitoring of steel bridges. The first generation of two wireless systems (one based on IEEE 802.11 and another on IEEE 802.15.4) from National Instruments has been evaluated in field conditions. This paper presents results of a study to characterize wireless communication in steel box girders and I-girders. In addition, enhancements to be made in the second generation are discussed.
Proceedings of SPIE | 2012
Jeremiah Fasl; Vasileios A. Samaras; Matt Reichenbach; Todd Helwig; Sharon L. Wood; David Potter; Richard Lindenberg; Karl H. Frank
Real-time, monitoring systems can enhance the bridge inspection process by providing data for estimating the health of the bridge and potentially notifying bridge owners of problems between inspection visits. A low-power, wireless, strain data acquisition device has recently been developed to acquire dynamic strain data. Strain gages can be used to monitor the number and size of stress cycles in fatigue-sensitive members. From the cycle count, Palmgren-Miners rule can be used to determine an effective stress range. The remaining fatigue life can then be calculated and compared to existing conditions and the age of the bridge. Because damage is expected to escalate over time, more frequent inspections may be needed when a bridge approaches its fatigue life. The strain node can be programmed in LabVIEW WSN to detect critical events or perform a rainflow analysis. To aid in system interaction, a software interface will be designed to allow for automated processing and transmission of data to a cloud server, thereby allowing engineers and bridge owners to access the data from anywhere so as to make informed decisions when prioritizing inspections. This paper will present the development of the strain node and the software interface.
Archive | 2002
Perry Steger; Garritt W. Foote; David Potter; James J. Truchard; Hugo A. Andrade; Joseph E. Peck; Brian Keith Odom
Archive | 2002
Perry Steger; Garritt W. Foote; David Potter; James J. Truchard
Archive | 2002
Perry Steger; Garritt W. Foote; David Potter; James J. Truchard
Archive | 2007
Perry Steger; Garritt W. Foote; David Potter; James J. Truchard; Brian Keith Odom
Archive | 2002
David Potter; Mohammed Kamran Shah
Archive | 2008
Perry Steger; Garritt W. Foote; David Potter; James J. Truchard; Brian Keith Odom