| Laser Magneto-Optic Rotation Spectrometer (LMORS) |
1998 |
31 pages |
| Authors:
Richard Billmers; William J. Scharpf; Kevin Owens; Alan Laux; NAVAL AIR WARFARE CENTER AIRCRAFT DIV PATUXENT RIVER MD
|
 | A magneto-optical rotation (MOR) spectrometer is disclosed having a laser as a light source and providing a high intensity input light source that yields improvements in the detection limits and in the dynamic operating ranges of the MOR spectrometer. |
|
| The Ocean Wave Dynamo: A Source of Magnetic Ambient Noise |
SEP 1997 |
43 pages |
| Authors:
Jurgen Waterman; SACLANT UNDERSEA RESEARCH CENTRE LA SPEZIA (ITALY)
|
| The electromagnetic dynamo field of sea surface waves, a consequence of the Lorentz force, has been measured with two simultaneously operating, closely spaced tri-axial magnetometers. Measurements from a magnetometer located in the center of a small, uninhabited island served to compensate measurements from a near-shore magnetometer for large-scale magnetic pulsations (basically of ionospheric origin), leaving the ocean wave dynamo field, effective close to shore only, as the dominant residual magnetic ... |
|
| Compact Environmental Anomaly Sensor (CEASE) Flight Integration Support Contract |
04 AUG 97 |
20 pages |
| Authors:
Bronislaw K. Dichter; John O. McGarity; Marilyn R. Oberhardt; David J. Sperry; Wallace Everest; AMPTEK INC BEDFORD MA
|
| The outer space environment experienced by a modern, electronically sophisticated spacecraft can be very hostile due to interactions between its complex, sensitive electronics systems and the naturally occurring energetic particle population indiginous to the solar system. The Compact Environmental Anomaly System (CEASE) has been developed as a small, low-power device to monitor space 'weather' and to provide autonomous warnings of conditions that may cause operational anomalies in the host spacecraft. ... |
|
| Nuclear Quadrupole Resonance (NQR) Method and Probe for Generating RF Magnetic Fields in Different Directions to Distinguish NQR from Acoustic Ringing Induced in a Sample |
01 AUG 1997 |
36 pages |
| Authors:
Allen N. Garroway; Joel B. Miller; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A nuclear quadrupole resonance (NQR) method and probe for generating RF magnetic fields in different directions to distinguish NQR from acoustic ringing induced in a sample. Generally, an RF magnetic field is generated along an axis towards a sample to induce a resonance signal in the sample. The resonance signal includes NQR and acoustic ringing. The resonance signal is detected along the RF magnetic field axis. The acoustic ringing is ... |
|
| Giant Magnetoresistive Sensors. Phase II |
15 JUL 1997 |
14 pages |
| Authors:
James M. Daughton; Mark Tondra; NONVOLATILE ELECTRONICS INC EDEN PRAIRIE MN
|
| This report covers primarily the period from May 15,1997 to July 25, 1997 - from month 10 through month 11 and into month 12 of the program. This period has concentrated on fabricating tunneling bridge sensors with on-chip bias coils, developing the test equipment needed to test sensors at 10(exp-8) Gauss, and developing a drive/sense scheme which can be used to overcome the effects of 1/f noise. As we near ... |
|
| Durability Patch: Repair and Life Extension of High Cycle Fatigue Damage on Secondary Structure of Aging Aircraft |
JUL 1997 |
32 pages |
| Authors:
Lynn C. Rogers; Joseph R. Maly; Ian R. Searle; Roy Ikegami; Wes Owen; Robert W. Gordon; David Conley; CSA ENGINEERING INC MOUNTAIN VIEW CA
|
| The Durability Patch Program addresses the repair and life enhancement of nuisance cracks which have been induced into secondary structure by resonant high cycle fatigue from aerovibroacoustics. For this type of damage, safety of flight concerns are virtually non-existant, but maintenance and repair costs are high. Conventional repair techniques consist of mechanically fastened, single sided doublers. For significant static in-plane loads and/or for significant vibration levels due to out-of-plane dynamic ... |
|
| Geophysical Characterization of Two UXO Test Sites (with) EMI Magnetometer Data (CD- ROM) |
01 JUN 1997 |
|
| Authors:
Dean Keiswetter; GEOPHEX LTD RALEIGH NC
|
 | ELECTRONIC FILE CHARACTERISTICS: 1,747 files; Background Standard Format (BSF) electromagnetic data. PHYSICAL DESCRIPTION: 1 computer laser optical disc (CD-ROM); 4 3/4 in.; 394 MB. ABSTRACT: This submittal describes Geophex's activities in support of the Geophysical Characterization of Two UXO Test Sites. Geophex was contracted to acquire electromagnetic and magnetic data at prepared UXO-test sites at Ft. Carson, CO, the week of October 28, 1996, and at Ft. A.P. Hill, VA, ... |
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| Geophysical Investigation at Mustard Gas Burial Ground, Naval Surface Warfare Center, Crane Division, Crane, Indiana |
JUN 97 |
30 pages |
| Authors:
Jose L. Llopis; Keith J. Sjostrom; William L. Murphy; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS GEOTECHNICAL LAB
|
| A geophysical investigation was conducted at the Mustard Gas Burial Ground (MGBG) at the Naval Surface Warfare Center, Crane Division, Crane, IN. The MGBG, an approximately 2-acre area, is a former Solid Waste Management Unit. The objective of the investigation was to detect and delineate anomalies indicating the locations of buried structures, objects, or disturbed zones associated with past hazardous waste burial at the MGBG. The locations of these objects ... |
|
| Giant Magnetoresistive Sensors A. Phase II |
15 MAY 97 |
14 pages |
| Authors:
James M. Daughton; Mark Tondra; NONVOLATILE ELECTRONICS INC EDEN PRAIRIE MN
|
| It was determined that some sort of pinning was required to achieve the desired material sensitivity. This presented a large practical difficulty in processing the SDT devices. This is because typical pinning materials, and FeMn in particular, are not compatible with the wet etch technique we were using for forming the top electrode of our SDT devices. Several possible solutions to this problem were identified, and one of those has ... |
|
| Performance of Power-Law Processor with Normalization for Random Signals of Unknown Structure |
05 MAY 97 |
95 pages |
| Authors:
Albert H. Nuttall; NAVAL UNDERSEA WARFARE CENTER NEWPORT DIV RI
|
| A signal (if present) is located somewhere in a band of frequencies characterized by a total of N search bins, along with uniform noise of unknown level per bin, N. The signal occupies an arbitrary set of N of these bins, where not only is the extent N unknown, but, in addition, the locations of the particular N bins occupied by the signal (if present) are unknown. Also, the average ... |
|
| Chemical Weapons Convention |
29 APR 1997 |
3 pages |
| Authors:
ARMY CHEMICAL MATERIALS AGENCY ABERDEEN PROVING GROUND MD
|
| On April 29, 1997, the Convention on the Prohibition of the Development, Production, Stockpiling, and Use of Chemical Weapons and on Their Destruction, known as the Chemical Weapons Convention (CWC), entered into force. At that time, the United States and 86 other nations became the first countries to sign and ratify the CWC. In doing so, the United States agreed to destroy all their chemical weapons and former chemical weapons ... |
|
| Reconfigurable Actuator-Sensor Arrays for the Active Control of Sound |
MAR 1997 |
14 pages |
| Authors:
Donald J. Leo; Jonathan P. How; CSA ENGINEERING INC PALO ALTO CA
|
| A reconfigurable actuator-sensor array is demonstrated for the active control of sound and vibration. The concept is motivated by applications in which shaped polyvinylidene fluoride films are used as error sensors for feedforward and feedback noise control. The advantage of the present concept as compared to a fixed- shape sensor is that the reconfigurable array can be adapted on line to account for uncertain structural dynamics, making it a more ... |
|
| Sixth-Order Difference Scheme for Sigma Coordinate Ocean Models |
MAR 1997 |
9 pages |
| Authors:
Peter C. Chu; Chenwu Fan; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| How to reduce the horizontal pressure gradient error is a key issue of using sigma-coordinate ocean models, especially of using primitive equation models for coastal regions. The error is caused by the splitting of the horizontal pressure gradient term into two parts and the subsequent incomplete cancellation of the truncation errors of those parts. Due to the fact that the higher the order of the difference scheme, the less the ... |
|
| South China Sea Warm Pool Detected in Spring From the Navy's Master Oceanographic Observational Data Set (MOODS) |
FEB 1997 |
12 pages |
| Authors:
Peter C. Chu; Hsing-Chia Tseng; C. P. Chang; J. M. Chen; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| A South China Sea warm pool with sea surface temperature (SST) higher than 29.5C, recently reported by Chu and Chang [1995a, b] and Chu et al. [1997}, appears in the central South China Sea (west of the Luzon Island) in boreal spring, strengthens until the onset of the summer monsoon (mid-May) and then weakens and disappears at the end of May. The transient features and interannual variabilities of the warm ... |
|
| Mine Sweeping System for Magnetic and Non-Magnetic Mines. |
28 JAN 1997 |
|
| Authors:
John F. Scarzello; Peter B. Keller; Richard W. Harrison; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A mine sweeping system including deployable horizontal antennas to establish a detection and navigation grid extending underwater from a beach to a distance offshore. A computer-controlled transmitter unit having a waveform generator and amplifier, transmits signals to each antenna, at unique frequencies and phases for different spatial locations within the grid. An autonomous underwater vehicle having multi-integrated sensors detects anomalies in the electromagnetic field caused by both magnetic and non-magnetic ... |
|
| Bridge Configuration for a Magneto-Resistive Linear-Displacement Sensor |
13 JAN 1997 |
26 pages |
| Authors:
Peter Lubitz; Lilian Hoines; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A thermal bridge includes a first Giant Magneto Resistance film having a layer with a fixed bias pointing in a first direction, and a second Giant Magneto Resistance film superposed on, and in thermal engagement with, the first Giant Magneto Resistance film. The second Giant 5 Magneto Resistance film has a layer with a fixed bias pointing in a second direction opposite to the first direction. |
|
| Field Demonstration of tbe SCAPS XRF Metals Sensor |
JAN 1997 |
7 pages |
| Authors:
W. T. Elam; Jane Adams; Karrol R. Hudson; Blair McDonald; Dan Eng; NAVAL RESEARCH LAB WASHINGTON DC
|
| The SCAPS XRF Metals Sensor adds metals detection capability to the DOD Site Characterization Penetrometer System (SCAPS). It works using X-ray Fluorescence (XRF) to detect-all metals above calcium in the subsurface soil. The sensor head contains a miniature x-ray tube and cooled solid-state detector to achieve performance comparable to laboratory units in a down-hole sensor. The sensor may be pushed to depths as far as 150 feet by the cone ... |
|
| Rigid Polyurethane Foam (RPF) Technology for Countermine (SEA) Program - Phase 1 |
JAN 1997 |
187 pages |
| Authors:
R. L. Woods; SANDIA NATIONAL LABS ALBUQUERQUE NM
|
| This Phase 1 report documents the results of one of the subtasks that was initiated under the joint Department of Energy (DOE)/Department of Defense (DoD) Memorandum of Understanding (MOU) for Countermine Warfare. The development of a foam that can neutralize mines and barriers and allow the safe passage of amphibious landing craft and vehicles was the objective of this subtask of the Sea Mine Countermeasures Technology program. This phase of ... |
|
| Chemical Weapons Disposal: Understanding Scheduled Downtime at Disposal Facilities |
1997 |
5 pages |
| Authors:
ARMY CHEMICAL MATERIALS AGENCY ABERDEEN PROVING GROUND MD
|
| Introduction The U.S. Army Chemical Materials Agency (CMA) is responsible for protecting and safely storing the nation's aging chemical weapons, while working toward the effective recovery, treatment and ultimate elimination of the nation s chemical warfare materiel and to enhance national security. Aging chemical weapons, many created during World War II, Korean and Cold War eras are safely stored in eight secured sites within the continental United States. The weapons ... |
|
| Leak Detector for Conductive Liquid Boiler. |
01 OCT 1996 |
|
| Authors:
Bryan L. Croft; Howard M. Spackman; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A leak detector for detecting a leak of an electrically conductive fluid from a vessel comprises an electrically conductive wire having a melting temperature less than an internal temperature of the vessel and greater than the external temperature of the vessel. The wire is stitched to a heat resistant fabric to hold the wire in place and to thermally and electrically insulate the wire when no leaking fluid is present. ... |
|
| Development of Data Fusion Algorithms for Detecting and Identifying Ordnance with Magnetometers and Ground Penetrating Radar |
20 SEP 1996 |
144 pages |
| Authors:
Eugene R. Leach; LEACH (EUGENE R) AND ASSOCIATES COLUMBUS OH
|
| This report records work performed to develop data fusion algorithms to detect buried unexploded ordnance with magnetometers and ground penetrating radar. Task 1 characterized the performance of a cesium magnetometer, a gradiometer, and a 3-axis fiber optic magnetometer. Data which were measured and/or generated by validated models were used to develop a set of appropriate target features that could be used to identify and characterize buried ordnance. The applicability of ... |
|
| Program for the Assessment of Background Bioaerosols in the Industrial City of Pune, India |
SEP 96 |
21 pages |
| Authors:
Hugh R. Carlon; EDGEWOOD RESEARCH DEVELOPMENT AND ENGINEERING CENTER ABERDEEN PROVING GROUND MD
|
| The Biological Systems Integration Team, Research and Technology Directorate, U.S. Army Edgewood Research, Development and Engineering Center (ERDEC), has many missions related to defense against biological aerosols. One of these is the establishment of sites inside and outside the U.S. to measure and characterize bioaerosols and to accumulate a reference database on biological backgrounds in the atmosphere. Our most completely instrumented site is at ERDEC, Aberdeen Proving Ground, MD. Other ... |
|
| Application of Inertial Sensors and Flux-Gate Magnetometer to Real-Time Human Body Motion Capture |
SEP 96 |
170 pages |
| Authors:
William Frey III; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Human body tracking for synthetic environment interface has become a significant human- computer interface challenge. There are several different types of motion capture systems currently available. Inherent problems, most resulting from the use of artificially-generated source signals, plague these systems. A proposed motion capture system is being developed at the Naval Postgraduate School which utilizes a combination of inertial sensors to overcome these difficulties. However, the current design exhibits azimuth ... |
|
| Electromagnetic Induction Sounding of Sea Ice Thickness |
JUN 96 |
13 pages |
| Authors:
Austin Kovacs; Deborah Diemand; John J. Bayer Jr; COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH
|
| Field results from a man-portable electromagnetic induction sounding instrument, with special plug-in data processing modules for the remote measurement of sea ice thickness, are discussed. The field trials indicate that the instrument was capable of estimating undeformed sea ice thickness, with a snow cover, generally within about 5% of the drill hole measured thicknesses from about 1.25 to 4.5 m. No ice under 1.25 m was sounded in this study. ... |
|
| Low-Cost Space Structure (LCSS) Experiment. Volume II of II |
JUN 1996 |
|
| Authors:
David DeYoung; Lawrence Robertson III; SVS INC ALBUQUERQUE NM
|
| The INSPECT program was a subset of the Low Cost Space Structure (LCSS) experiment in Volume I of this technical report. Under the program, a helicopter mounted pointing and tracking was designed, fabricated, tested, and used to collect high resolution images of power transmission. The heart of the system was a precision stabilized gimbal to which narrow-field and wide-field digital cameras were mounted. Track algorithms capable of operating on power ... |
|
| Low-Cost Space Structure (LCSS) Experiment. Volume I of II |
JUN 1996 |
|
| Authors:
David DeYoung; Lawrence Robertson III; SVS INC ALBUQUERQUE NM
|
| The Low-Cost Space Structure (LCSS) experiment was a two-year Phase II Small Business Innovative Research (SBIR) technology program to develop the concept for a small, lightweight, space-borne optical imaging system. The goals of the program were to formulate the concept design of a sparse array optical imaging system and the supporting satellite and to validate the concept in a laboratory demonstration. The results are described in this final report. They ... |
|
| Triaxial Magnetic Heading Sensing Apparatus Having Magnetaresistors and Nulling Coils. |
21 MAY 1996 |
|
| Authors:
Steven J. Koerner; Anthony E. Lifur; Michael J. Wall; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A triaxial magnetic heading sensing apparatus includes nulling coils and magnetoresistive sensors having inputs and outputs. The nulling coils are arranged in parallel relation to three orthogonal planes intersecting at a common center point. The sensors are disposed along orthogonal axes in parallel relation to the orthogonal planes and in close proximity to the center point. Each sensor has a bridge configuration balanced in the absence of an applied external ... |
|
| Nucleation and Growth of Fe on GaAs(001)-(2x4) Studied by Scanning Tunneling Microscopy |
15 APR 1996 |
5 pages |
| Authors:
P. M. Thibado; E. Kneedler; B. T. Jonker; B. R. Bennett; B. V. Shanabrook; L. J. Whitman; NAVAL RESEARCH LAB WASHINGTON DC
|
| The nucleation and growth of Fe on GaAs(001)-(2x4) has been studied in situ with scanning tunneling microscopy. The growth is dominated by the structure of the substrate reconstruction. Fe initially forms stable six- to eight-atom two-dimensional islands confined to the first-layer As-dimer rows. The islands preferentially coalesce along the rows, leading to an anisotropic film morphology that persists for at least the first 50 angstrom of growth. These results provide ... |
|
| Effective Magnetic Method for Detecting Longitudinal Cracks in the Pipes of Pipe-Line Transport |
APR 1996 |
3 pages |
| Authors:
G. Shelihov; V. Usoshin; V. Lozovsky; V. Rozov; JOINT OIL ANALYSIS PROGRAM PENSACOLA FLTECHNICAL SUPPORT CENTER
|
| The magnetic method based on sensing the magnetic field distribution in the vicinity of a defect with a special measuring device is intended for using in flaw detector gears for intra-pipe inspection and allows detecting longitudinal cracks, corrosion affections on an external surface. The instrument has been developed which implements this method and features high noise immunity and tolerance for many external factors. |
|
| A New Electronic Viscometer Based on Rayleigh Wave Mechanics |
APR 1996 |
10 pages |
| Authors:
James J. Kauzlarich; Robert A. Ross; D. S. Abdallah; VIRGINIA UNIV CHARLOTTESVILLE
|
| The operation of a new viscometer is shown to be based on Rayleigh wave mechanics, where a thin walled tube of 5 mm diameter is immersed to a fixed depth of 60 mm in a fluid and is caused to undergo axial vibrations due to a vibrating piezoelectric plate which supports the tube. The motion of the tube is damped by the fluid, and the piezoelectric crystal feedback circuit gives ... |
|
| Ultra-Broadband Hydrophone. |
22 MAR 1996 |
14 pages |
| Authors:
Roger L. Woodall; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| The present invent ion relates to an ultra-broadband hydrophone which has two major electronic components and one mechanical component. The first electronic component comprises a flux gate magnetometer for sensing changes in an ambient magnetic field and for creating an electrical signal representative of the ambient magnetic field. The second electronic component comprises an electrical circuit for demodulating the electrical signal and a low pass filter for smoothing the demodulated ... |
|
| Advanced Degaussing Coil System. |
09 JAN 1996 |
|
| Authors:
John J. Holmes; Shirley Steffey; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| The static magnetic field signature of a sea-going vessel is reduced by supply of degaussing current to pairs of loop coils adjacent to the port and starboard sides of the vessel hull. The coils of each pair are positioned at equal angles to a vertical plane extending longitudinally along the keel of the hull. The degaussing currents in the respective coils of each pair are simultaneously varied with respect to ... |
|
| Electron Tunneling Magnetic Field Sensor with Constant Tunneling Current Maintained Between Tunneling Tip and Rotatable Magnet. |
02 JAN 1996 |
|
| Authors:
Daniel DiLella; Richard J. Colton; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| The magnetic sensor of this invention is characterized by a magnet suspended on a torsion bar or wire and by a tunneling tip separated from one end of the magnet, a gap between the tip and the magnet that is small enough to support a tunneling current, an electrical source for imposing a constant biasing voltage across the gap, an electrical force to maintain the magnet and the tip sufficiently ... |
|
| Cost and Effectiveness Analysis Modeling for Demining Operations |
JAN 96 |
91 pages |
| Authors:
Steven M. Buc; George C. Tillery; SYSTEM PLANNING CORP ARLINGTON VA
|
| This study's objectives were to assess the cost and operational effectiveness of state-of-the-art and emerging demining technologies, and to quantify the remaining challenges and potential benefits of developing new technologies. Its goals were to: (1) understand current demining operations and techniques; (2) identify the key cost and operational parameters which affect demining; (3) model demining operations and quantify the current methods in terms of these parameters; and (4) using this ... |
|
| Ferroelectric Ceramic/Polymer Bimorph Sensor for Strain Measurement in Laminates. |
JAN 1996 |
3 pages |
| Authors:
M. P. Wenger; D. K. Das-Gupia; UNIVERSITY COLL OF NORTH WALES BANGOR SCHOOL OF ELECTRONIC ENGINEERING AND CO MPUTER SYSTEMS
|
| Flexural (or bending) piezoelectricity of a piezoelectric monomorph film may be enhanced by bonding two or even a number of multiple poled films to form a bimorph or a multimorph. The compliance of ceramic/polymer composite is generally greater than piezoceramics. We have produced calcium modified lead titanate, PTCa/copolymer of vinylidene fluoride trifluoroethylene, P(VDF-TrFE) and PTCa/Epoxy composites and have successfiilly embedded such composite films in glass-laminate structure and detected acoustic emission ... |
|
| Development of Improved Geophysical Imaging Techniques for Environmental Site Characterization |
31 DEC 95 |
183 pages |
| Authors:
Robert J. Greaves; Matthijs W. Haartsen; Daria L. Kutrubes; Jung M. Lee; David P. Lesmes; MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF EARTH ATMOSPHERIC AND PLANETARY SCIENCES
|
| The objective of this research was to develop geophysical techniques for environmental site characterization: (1) a multi-offset ground penetrating radar profiling technique; (2) a nonlinear seismic refraction traveltime tomography; (3) a 3-D d.c. resistivity tomography; and (4) an electroseismic method. The goals of this project were accomplished successfully and a large amount of field data were collected and modeled for characterizing actual environmental sites. Specifically, we demonstrate that performing GPR ... |
|
| Magnetic Inductive Sensor Applications for Robotic Ordnance Detection and Recovery |
DEC 95 |
92 pages |
| Authors:
William T. Webber; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The use of robotic vehicles to detect and remove unexploded ordnance (UXO) from battlefields and training ranges is currently being explored by the Naval Explosive Ordnance Technology Division, Indian Head, Maryland. In support of this effort, research was conducted on the characterization and use of small commercially available magnetic inductance sensors to detect a variety of common U.S. submunitions. Sensor test bed mounting on a small wheeled vehicle with a ... |
|
| Validation of the Magneto-Optic/Eddy-Current Imager |
NOV 95 |
59 pages |
| Authors:
Vanessa J. Brechling; Floyd Spencer; NORTHWESTERN UNIV EVANSTON IL TRANSPORTATION CENTER
|
| This report details the validation analysis of PRI's Magneto-Optic/ Eddy-Current Imager (MOl). The analysis includes both a reliability analysis of the system and an economic analysis of the potential benefits and costs related to its use. The reliability analysis consisted of blind inspections of well characterized panels simulating a fuselage lap splice. The panels contained cracks of known sizes emanating from under rivet heads on the upper row of rivets. ... |
|
| Detection and Discrimination Techniques for Total Field Magnetometers and Multi-Axis Gradiometers |
NOV 95 |
144 pages |
| Authors:
D. DeProspo; R. DiMarco; NAVAL EXPLOSIVE ORDNANCE DISPOSAL TECHNOLOGY CENTER INDIAN HEAD MD
|
| A project investigating detection and discrimination techniques for total field magnetometers and multiaxis gradiometers is being performed under the Unexploded Ordnance (UXO) Clearance Technology Program sponsored by the U.S. Army Environmental Center and managed by the Naval Explosive Ordnance Disposal Technology Division. The project was developed to address the Government's need for reliable, efficient, and cost effective UXO clearance technology. This need has become a priority within the Department of ... |
|
| Zero Field Degaussing System and Method. |
31 OCT 1995 |
|
| Authors:
John J. Holmes; Milton H. Lackey; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A system and method are provided for degaussing a vessel moving over an underwater magnetic detector. A location at the vessel residing over the magnetic detector is continuously provided to a controller. The vessel is equipped with a plurality of degaussing coils such that each is independently controllable. Degaussing coil currents are determined by the controller according to a least squares minimization routine such that an off-board magnetic field of ... |
|
| Single Geostatic Orbital Satellite in Tracking Ground-Based Mobile Radio Transmitter |
11 OCT 95 |
23 pages |
| Authors:
Chris Le Marshall; NATIONAL AIR INTELLIGENCE CENTER WRIGHT-PATTERSON AFB OH
|
| ESLS is a very specialized satellite geo-position system. It is also used in satellite tracking and communication system(SAT/TARC). It can be used to pinpoint any objects that are equipped with ESLS low power radio transmitter. This technology can be used as a new method in radio tracking. ANNOTATION: Single Geostatic Orbital Satellite in Tracking Ground-Based Mobile Radio Transmitter. --Translation. |
|
| Microwave Probe for Mass Measurements of a Water Plume |
30 SEP 95 |
22 pages |
| Authors:
J. Y. Choe; K. A. Boulais; S. T. Chun; K. A. Irwin; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV SILVER SPRING MD
|
| The use of water plumes produced by shallow underwater explosions is being studied as an effective, low cost defense of ships against low flying missiles. The key element for the success of this concept is the total water mass contained within the plume. An experimental program has been conducted to measure the plume water mass in situ since no previous data exist relative to this ship self defense concept. Here ... |
|
| Warhead Influence. |
19 SEP 1995 |
|
| Authors:
Eugene H. Beach; Armand Cioccio; Earl A. Schuchard; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| An active electromagnetic influence firing system has transmitter coils and receiver coils mounted on a single warhead section. One set of receiver coils has vertical look capability for detecting surface ships and another set has 360 deg look capability for detecting submarines. An influence electronics package automatically nulls out directly induced electromagnetic radiation and passes only the signature received from targets. Amplitude, duration, and frequency criteria implemented by circuitry in ... |
|
| Geophysical Investigation of Cluster 13, Edgewood Area, Aberdeen Proving Ground, Maryland |
SEP 95 |
47 pages |
| Authors:
Michael K. Sharp; Landris T. Lee Jr; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS GEOTECHNICAL LAB
|
| A geophysical investigation consisting of electromagnetic, magnetic, and ground penetrating radar methods was conducted at the Cluster 13 site located in the Edgewood Area of the Aberdeen Proving Ground, Maryland. The purpose of the investigation was to locate underground structures such as barrels and tanks. The results indicated the presence of an unknown underground anomaly at one site and its location was mapped. (MM) |
|
| Leaky Coaxial Cable Sensor Studies |
AUG 95 |
101 pages |
| Authors:
Charles R. Malone; Larry N. Lynch; Lenford N. Godwin; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS GEOTECHNICAL LAB
|
| Two research studies were conducted by the U.S. Army Engineer Waterways Experiment Station, both related to eaky coaxial cable sensors. In one study, the newly developed TR I sensor cable was tested and evaluated. Basic performance characteristics of the TRl cable were determined including detection field width/height and invalid alarm rate. In the other study, alternate sealant materials and a revised slot/sealant configuration were evaluated for sensor cable installation in ... |
|
| Sensor for Locating Objects in the Sea Having a Conductive Shell to Inject Electric Current into the Sea and a Sensor Coil in the Shell. |
04 JUL 1995 |
|
| Authors:
William M. Wynn; John T. Bono; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A sensor for sensing the location of objects buried in the loose sediment in the bed of the sea. A hollow, cylindrically symmetric, conductive shell is used to inject current into seawater at its tips along its axis. A sensor coil oriented along the axis ignores all magnetic fields except those along the axis, and is used to measure return signals. This is particularly useful in detecting dielectric objects buried ... |
|
| Giant Magnetoresistive Sensors. Phase 1 |
01 MAY 95 |
|
| Authors:
James M. Daughton; NONVOLATILE ELECTRONICS INC EDEN PRAIRIE MN
|
|
| Fiber Optic Interferometric Electric Field and Voltage Sensor Utilizing and Electrostrictive Transducer. |
07 MAR 1995 |
|
| Authors:
Sandeep T. Vohra; Frank Bucholtz; Alan D. Kersey; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A fiber optic interferometer sensor system utilizing a fiber optic interferometer with an elecrostrictive transducer bonded to one of first and second optical fiber arms of the interferometer for obtaining excellent low frequency voltage detectors and electric field sensors. The non-linear characteristics of the electrostrictive transducer allows for detecting low frequency or dc signals at sidebands of a high frequency carrier, resolving extremely small voltages at low frequencies, or sensing ... |
|
| Channel Equalized DC Squid Flux-Locked Loop. |
07 FEB 1995 |
|
| Authors:
Meir Gershenson; Robert J. McDonald; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A DC superconductor quantum interference device (i.e. DC SQUID) is used in a flux-looked loop as a sensitive detector of magnetic flux. Prior art devices of this sort had a transfer function which was frequency-limited by the transfer function of impedance matching circuitry which is used to connect the DC SQUID with the first preamplifier, which amplifies the DC SQUID signal before it is applied to a detector circuit. The ... |
|
| Surface Towed Ordnance Locator System |
FEB 95 |
130 pages |
| Authors:
ARMY FOREIGN SCIENCE AND TECHNOLOGY CENTER CHARLOTTESVILLE VA
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| This report presents the results of an evaluation of the capabilities and performance of the prototype Surface Towed Ordnance Locator System. The system includes a cesium vapor magnetometer array towed by a man-operated, all- terrain vehicle. Data processing and navigation subsystems are utilized to recognize targets and chart their locations. The evaluation was based on surveys for unexploded ordnance at the Marine Corps Air-Ground Combat Center, Twenty- nine Palms, CA ... |
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Magnetic & Electric Fld Detection & Detectors
