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in subjects: "Signals"

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Recording Equipment for Internal Friction Measurements

An apparatus was developed for recording internal friction data in such a manner as to circumvent many of the laborious and time-consuming observations and calculations usually associated with these measurements. An optical lever is used and the passage of the beam across the scale is detected by photoconductive cells. The cells are strategically located so that, when their signals are fed through a multichannel switching circuit to the pens of an operation recorder, a plot of the logarithm of … more

Date: October 31, 1961

Creator: Stephenson, R. L. & McCoy, H. E. Jr.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

An overview of acoustic telemetry

Acoustic telemetry has been a dream of the drilling industry for the past 50 years. It offers the promise of data rates which are one-hundred times greater than existing technology. Such a system would open the door to true logging-while-drilling technology and bring enormous profits to its developers. The basic idea is to produce an encoded sound wave at the bottom of the well, let it propagate up the steel drillpipe, and extract the data from the signal at the surface. Unfortunately, substant… more

Date: January 1, 1992

Creator: Drumheller, D. S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Noise Considerations in Nuclear Pulse Amplifiers

The effects of certain pulse-shaping networks on the signal-to-noise ratio of a nuclear pulse amplifier were considered. The shaping networks discussed are: equal RC-integrating and RC-differentiating time constant, single- delay-line clipper and RC integrator, and doubledelay-line clipper and RC integrator. The effects of these networks on the signal, when high count rates and overload pulses are present, were also considered. Equations and curves were developed for the energy resolution (sign… more

Date: December 20, 1961

Creator: Landis, D. A.

Item Type: Thesis or Dissertation

Partner: UNT Libraries Government Documents Department

open access

CURRENT STATUS OF THE AC IONIZATION CHAMBER

ABS>The design concept of an a-c ionization chamber and its supporting electronics is described. Several designs are possible and the sensors can be tailored to specific requirements when necessary. Mode of operation, signal voltage development, and switching frequency are discussed. High-sensitivity operation is described. Requirements for high-temperature, power-level operation are outlined. (M.C.G.)

Date: July 1, 1961

Creator: Rusch, G.K.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Atmospheric Signals From Explosions and Their Interpretation

Results are reported from a series of experimental highexplosive shots under inversion conditions at the Nevada Test Site which were made in an attempt to refine blast prediction techniques. Applications of the data in determinations of the amount of energy which remains in the blast wave as it reaches acoustic level and in determinations of the magnitude of the reflection factor when the blast wave strikes the ground are discussed. Data on shock wave propagation are presented graphically. It i… more

Date: December 1, 1959

Creator: Reed, J. W.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Microearthquakes in geothermal prospecting

No Description Available.

Date: December 10, 1974

Creator: Lange, A.L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Analysis of angular dependent Auger spectroscopy (ADAS) based on a quasiatomic model. [Partial waves]

Calculated results are presented which are in good agreement with published M/sub 2/, /sub 3/VV Cu (100) ADAS data. The calculations are based on a quasiatomic model where each individual Auger emission is a partial wave of definite (l,m) character, but (l,m) may differ from emission to emission. The (l,m) emission weights have been estimated by fitting the data with a linear combination of calculated intensities for (l,m) up to l = 5. It is found that surprisingly few (l,m) values are necessar… more

Date: January 1, 1977

Creator: Davis, H.L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Geothermal down-well instrumentation. Final report

Work to develop a telemetry link between a Sperry downwell geothermal turbo-pump and the well-head, without the requirement for cables within the pipe-string, is described. Two methods were studied, built, and tested in a well at Heber, California, during the first field tests on the pump. These were: (a) an acoustic scheme which transmitted a modulated 4 kHz acoustic carrier on the pipe-string and (b) an electromagnetic scheme which used the exhaust steam pipe annulus as a coaxial transmission… more

Date: April 1, 1977

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Spectrum-transformed sequential testing method for signal validation applications

The Sequential Probability Ratio Test (SPRT) has proven to be a valuable tool in a variety of reactor applications for signal validation and for sensor and equipment operability surveillance. One drawback of the conventional SPRT method is that its domain of application is limited to signals that are contaminated by gaussian white noise. Nongaussian process variables contaminated by serial correlation can produce higher-than-specified rates of false alarms and missed alarms for SPRT-based surve… more

Date: January 1, 1992

Creator: Gross, K.C. (Argonne National Lab., IL (United States)) & Hoyer, K.K. (Northwestern Univ., Evanston, IL (United States). Dept. of Industrial Engineering and Management Sciences)

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Readily implemented enhanced sinusoid detection in noise

Significant efforts have been devoted, spanning many years, to the problem of sinusoid detection in noise. Many of these efforts have produced superb, yet complex, algorithms which may be difficult to use for a wide segment of the Digital Signal Processing (DSP) community. This paper presents a simple, easily implemented and high effective method which solves this problem. This method severely degrades non-sinusoidal noise while leaving the embedded sinusoid(s) relatively undisturbed. The algor… more

Date: March 5, 1992

Creator: Lindsay, K.V.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Photomultiplier characteristics considerations for the deep underwater muon and neutrino detection system

The results of an investigation of the characteristics of photomultipliers for the Deep Underwater Muon and Neutrino Detection (DUMAND) System are discussed. The pulse-height resolution, the afterpulsing phenomena and the gain sensitivity to the ambient magnetic field have been determined for large photocathode area photomultipliers. Furthermore, the transient time difference, the single photoelectron time spread, and the collection and photocathode quantum efficiency uniformity as a function o… more

Date: February 23, 1980

Creator: Leskovar, B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Development and testing of an integrated signal validation system for nuclear power plants

The approach for signal validation, instrument fault isolation and characterization incorporates some of the methods used in the past, and new techniques developed under this project. The general architecture consists of parallel signal processing modules. Each of the modules performs a specific task. The current architecture consists of seven signal processing modules. There is no direct communication between the modules. Any cross information desired must be requested at the system executive … more

Date: September 1, 1989

Creator: Upadhayaya, B. R.; Kerlin, T. W.; Holbert, K. E.; Glockler, O.; Morgenstern, V. M.; Frei, Z. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Computer simulation of low-frequency electromagnetic data acquisition

Computer simulation of low frequency electromagnetic (LFEM) digital data acquisition in the presence of natural field noise demonstrates several important limitations and considerations. Without the use of a remote reference noise removal scheme it is difficult to obtain an adequate ratio of signal to noise below 0.1 Hz for frequency domain processing and below 0.3 Hz base frequency for time domain processing for a typical source-receiver configuration. A digital high-pass filter substantially … more

Date: February 1, 1982

Creator: SanFilipo, W. A. & Hohmann, G. W.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

MXLKID: a maximum likelihood parameter identifier. [In LRLTRAN for CDC 7600]

MXLKID (MaXimum LiKelihood IDentifier) is a computer program designed to identify unknown parameters in a nonlinear dynamic system. Using noisy measurement data from the system, the maximum likelihood identifier computes a likelihood function (LF). Identification of system parameters is accomplished by maximizing the LF with respect to the parameters. The main body of this report briefly summarizes the maximum likelihood technique and gives instructions and examples for running the MXLKID progr… more

Date: July 1, 1980

Creator: Gavel, D. T.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

The Generation of Poisson Time Distributed Random Pulses

The need for a source of pulses randomly distributed in time according to the Poisson distribution is discussed. A theoretical analysis showed that these pulses may be generated by employing an electrical white noise'' source. Calculations indicated the feasibility of a generator capable of producing Poisson pulse at a maximum average rate of one megacycle. The results of laboratory experiments support the calculations and demonstrate the nadequacy of using periodic pulses to determine instrume… more

Date: June 1, 1962

Creator: Wilde, N.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Data analysis for neutron monitoring in an enrichment facility. [To detect high-enriched uranium production]

Area monitoring of neutron radiation to detect high-enriched uranium production is a potential strategy for inspector verification of operations in the cascade area of a centrifuge enrichment facility. This paper discusses the application of statistical filtering and hypothesis testing procedures to experimental data taken in an enrichment facility. The results demonstrate that these data analysis methods can enhance detection of facility misoperation by neutron monitoring.

Date: January 1, 1982

Creator: Markin, J.T.; Stewart, J.E. & Goldman, A.S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

A universal, fault-tolerant, non-linear analytic network for modeling and fault detection

The similarities and differences of a universal network to normal neural networks are outlined. The description and application of a universal network is discussed by showing how a simple linear system is modeled by normal techniques and by universal network techniques. A full implementation of the universal network as universal process modeling software on a dedicated computer system at EBR-II is described and example results are presented. It is concluded that the universal network provides d… more

Date: March 6, 1992

Creator: Mott, J. E. (Advanced Modeling Techniques Corp., Idaho Falls, ID (United States)); King, R. W.; Monson, L. R.; Olson, D. L. & Staffon, J. D. (Argonne National Lab., Idaho Falls, ID (United States))

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Electronics Engineering Department Thrust Area report FY'84

This report describes the work of the Electronics Engineering Department Thrust Areas for FY'84: diagnostics and microelectronic engineering; signal and control engineering; microwave and pulsed power engineering; computer-aided engineering; engineering modeling and simulation; and systems engineering. For each Thrust Area, an overview and a description of the goals and achievements of each project is provided.

Date: January 1, 1984

Creator: Minichino, C. & Phelps, P.L. (eds.)

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Adaptive signal processor

An experimental, general purpose adaptive signal processor system has been developed, utilizing a quantized (clipped) version of the Widrow-Hoff least-mean-square adaptive algorithm developed by Moschner. The system accommodates 64 adaptive weight channels with 8-bit resolution for each weight. Internal weight update arithmetic is performed with 16-bit resolution, and the system error signal is measured with 12-bit resolution. An adapt cycle of adjusting all 64 weight channels is accomplished i… more

Date: July 1, 1980

Creator: Walz, H.V.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

CM-458/U Signal Comparator

The development history, the physical and functional characteristics, and the production activity of the CM-458/U Signal Comparator is described. The CM-458/U Signal Comparator is a test device used to verify proper delivery by the aircraft control equipment of the unique signal used in the prearming of modern nuclear weapons. CM-458/U monitors voltage levels, pulse widths and signal sequence to verify correctness.

Date: June 1, 1980

Creator: Merritt, W. G. & Kestly, J. D.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

VISAR: 2 1/2 minutes for data reduction

Starting with a pair of signals obtained by electronically subtracting photodetector outputs from any VISAR, it is possible to plot velocity vs time, velocity vs distance, and distance vs time in 2 1/2 min using an LSI-11/23 computer. This includes time for six iterations of time shift with the resulting polar plots and operator interactions. The velocity calculating algorithm and a flow chart of the computer program are presented.

Date: January 1, 1983

Creator: Hemsing, W.F.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Subsurface radar applications in the Delaware Basin. Final report, June 1, 1980-January 31, 1981. [To probe into potash bed]

Purpose was to find a method of probing into potash to determine if dangers lie ahead. Of specific interest to Sandia, was the problem of outlining a breccia pipe which Mississippi Chemical Company (MCC) found protruded into the potash bed in Carlsbad, New Mexico, they were mining. MCC mined around it and continued their work. If, however, the discontinuity in the ore (breccia pipe) had any fractures linking with a high pressure water zone above the mining level, the act of mining into the pipe… more

Date: October 1, 1981

Creator: Unterberger, R.R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

High-speed differential track-hold digitizer

Obtaining accurate measurements in noisy environments or measurements with slowly varying background biases can be difficult, and at times impossible, when the background variation has a high dynamic range. Obtaining useful data with resolutions of one part in 10,000 (0.01%) in these types of environments can be simplified through the use of a differential track-and-hold system. A differential technique is described to obtain ground reference correction during real-time high-speed data collecti… more

Date: December 1, 1979

Creator: Van Hook, A.R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Real time loss detection for SNM in process

This paper discusses the basis of a design for real time special nuclear material (SNM) loss detectors. The design utilizes process measurements and signal processing techniques to produce a timely estimate of material loss. A state estimator is employed as the primary signal processing algorithm. Material loss is indicated by changes in the states or process innovations (residuals). The design philosophy is discussed in the context of these changes.

Date: March 20, 1980

Creator: Candy, J. V.; Dunn, D. R. & Gavel, D. T.

Item Type: Article

Partner: UNT Libraries Government Documents Department