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Modified Noise Power Ratio testing of high resolution digitizers

Description: A broadband, full signal range, side-by-side (tandem) test method for estimating the internal noise performance of high resolution digitizers is described and illustrated. The technique involves a re-definition of the traditional Noise Power Ratio (NPR) test, a change that not only makes this test applicable to higher resolution systems than was previously practical, but also enhances its value and flexibility. Since coherence analysis is the basis of this new definition, and since the application of coherence procedures to high resolution data poses several problems, this report discusses these problems and their resolution.
Date: May 1, 1994
Creator: McDonald, T. S.
Partner: UNT Libraries Government Documents Department

Report on the test and evaluation of the Chaparral Physics Model 4.1.1 prototype microbarograph for CTBT infrasound array application

Description: The Sandia National Laboratories has tested and evaluated the Chaparral Physics Model 4.1.1 prototype infrasound sensor to CTBT specifications. The sensor was characterized by using a piston-phone chamber to set and measure sensor sensitivity. Multiple sensor side-by-side coherence analysis testing provided a measure of sensor relative gain and phase; sensor self-noise was computed using this technique. The performance of the sensor calibration circuitry was evaluated. Sensor performance was compared to CTBT specifications. The Chaparral sensor met or exceeded all CTBT specifications.
Date: January 1, 1998
Creator: Kromer, R.P. & McDonald, T.S.
Partner: UNT Libraries Government Documents Department

Evaluation of infrasound sensors

Description: Sandia is evaluating the performance of various infrasound sensors that could be used as part of the International Monitoring Systems (IMS). Specifications for infrasound stations are outlined in CTBT/PC/II/1/Add.2. This document specifies minimum requirements for sensor, digitizer and system. The infrasound sensors evaluation task has the following objectives: provide an overview of the sensors presently in use; evaluate these sensors with respect to the requirements of the IMS.
Date: August 1, 1998
Creator: Kromer, R.P. & McDonald, T.S.
Partner: UNT Libraries Government Documents Department

Acoustic and Seismic Modalities for Unattended Ground Sensors

Description: In this paper, we have presented the relative advantages and complementary aspects of acoustic and seismic ground sensors. A detailed description of both acoustic and seismic ground sensing methods has been provided. Acoustic and seismic phenomenology including source mechanisms, propagation paths, attenuation, and sensing have been discussed in detail. The effects of seismo-acoustic and acousto-seismic interactions as well as recommendations for minimizing seismic/acoustic cross talk have been highlighted. We have shown representative acoustic and seismic ground sensor data to illustrate the advantages and complementary aspects of the two modalities. The data illustrate that seismic transducers often respond to acoustic excitation through acousto-seismic coupling. Based on these results, we discussed the implications of this phenomenology on the detection, identification, and localization objectives of unattended ground sensors. We have concluded with a methodology for selecting the preferred modality (acoustic and/or seismic) for a particular application.
Date: March 31, 1999
Creator: Elbring, G.J.; Ladd, M.D.; McDonald, T.S. & Sleefe, G.E.
Partner: UNT Libraries Government Documents Department

Southwest Retort, Volume 2, Number 2, November 1949

Description: This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community. Published monthly during long academic semesters.
Date: November 1949
Creator: American Chemical Society. Dallas/Fort Worth Section.
Partner: UNT Libraries

Southwest Retort, Volume 2, Number 3, December 1949

Description: This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community. Published monthly during long academic semesters.
Date: December 1949
Creator: American Chemical Society. Dallas/Fort Worth Section.
Partner: UNT Libraries

Southwest Retort, Volume 2, Number 4, January 1950

Description: This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community. Published monthly during long academic semesters.
Date: January 1950
Creator: American Chemical Society. Dallas/Fort Worth Section.
Partner: UNT Libraries

Southwest Retort, Volume 2, Number 5, February 1950

Description: This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community. Published monthly during long academic semesters.
Date: February 1950
Creator: American Chemical Society. Dallas/Fort Worth Section.
Partner: UNT Libraries

Southwest Retort, Volume 2, Number 6, March 1950

Description: This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community. Published monthly during long academic semesters.
Date: March 1950
Creator: American Chemical Society. Dallas/Fort Worth Section.
Partner: UNT Libraries

Southwest Retort, Volume 2, Number 7, April 1950

Description: This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community. Published monthly during long academic semesters.
Date: April 1950
Creator: American Chemical Society. Dallas/Fort Worth Section.
Partner: UNT Libraries

Southwest Retort, Volume 2, Number 1, October 1949

Description: This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community. Published monthly during long academic semesters.
Date: October 1949
Creator: American Chemical Society. Dallas/Fort Worth Section.
Partner: UNT Libraries

Southwest Retort, Volume 5, Number 1, October 1952

Description: This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community. Published monthly during long academic semesters.
Date: October 1952
Creator: American Chemical Society. Dallas/Fort Worth Section.
Partner: UNT Libraries

Case study: Unattended ground sensor phenomenology and signal processing

Description: In the fall of 1995, a unique unattended ground sensor experiment was conducted at the Nevada Test Site. In the experiment, a variety of electro-mechanical equipment was operated, while data was gathered using a number of different types of unattended sensors at different locations. The sensors in this study included seismometers, accelerometers, electric dipole sensors, magnetometers and microphones. In this paper, the authors present some key results form the signal processing of the data from this experiment. The goal of the signal processing was to quantify some of the effects of range on signal propagation, and to determine the ability to detect signals from the equipment, to identify the equipment and to locate the equipment. Some of the physical phenomenon which can affect unattended ground sensor performance will be discussed. The paper will also include a discussion of how the geophysical site characteristics can affect the performance of unattended ground-deployed sensors. While data from a number of different types of sensors were gathered in this experiment, in this paper the authors concentrate on physical phenomenon which can affect seismic sensors and the processing of seismic data.
Date: December 31, 1996
Creator: Erteza, I.A.; Elbring, G.J.; McDonald, T.S.; Claassen, J.P.; Baumgardt, D.R. & Wolford, J.K.
Partner: UNT Libraries Government Documents Department

Southwest Retort, Volume 5, Number 2, November 1952

Description: This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community. Published monthly during long academic semesters.
Date: November 1952
Creator: American Chemical Society. Dallas/Fort Worth Section.
Partner: UNT Libraries

Southwest Retort, Volume 5, Number 3, December 1952

Description: This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community. Published monthly during long academic semesters.
Date: December 1952
Creator: American Chemical Society. Dallas/Fort Worth Section.
Partner: UNT Libraries

Southwest Retort, Volume 5, Number 4, January 1953

Description: This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community. Published monthly during long academic semesters.
Date: January 1953
Creator: American Chemical Society. Dallas/Fort Worth Section.
Partner: UNT Libraries

Southwest Retort, Volume 5, Number 5, February 1953

Description: This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community. Published monthly during long academic semesters.
Date: February 1953
Creator: American Chemical Society. Dallas/Fort Worth Section.
Partner: UNT Libraries

Southwest Retort, Volume 5, Number 6, March 1953

Description: This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community. Published monthly during long academic semesters.
Date: March 1953
Creator: American Chemical Society. Dallas/Fort Worth Section.
Partner: UNT Libraries

Southwest Retort, Volume 5, Number 7, April 1953

Description: This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community. Published monthly during long academic semesters.
Date: April 1953
Creator: American Chemical Society. Dallas/Fort Worth Section.
Partner: UNT Libraries

The Activator, Volume 4, Number 2, November 1947

Description: This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community. Published monthly during long academic semesters.
Date: November 1947
Creator: American Chemical Society. Dallas/Fort Worth Section.
Partner: UNT Libraries

The Activator, Volume 4, Number 3, December 1947

Description: This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community. Published monthly during long academic semesters.
Date: December 1947
Creator: American Chemical Society. Dallas/Fort Worth Section.
Partner: UNT Libraries

The Activator, Volume 4, Number 4, January 1948

Description: This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community. Published monthly during long academic semesters.
Date: January 1948
Creator: American Chemical Society. Dallas/Fort Worth Section.
Partner: UNT Libraries