Performance Of A Magnetic Data Acquisition System Magdas During The Naval Research Laboratory 99 Arctic Aeromagnetic Survey
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A Highly Portable Data Acquisition System for Total Magnetics Field Measurements
| Author | : Daniel Steiger |
| Publisher | : |
| Total Pages | : 27 |
| Release | : 1980 |
| Genre | : |
| ISBN | : |
At the Naval Research Laboratory highly portable intelligent terminals are being utilized aboard oceanographic platforms for the acquisition and storage of total magnetic field measurements. Described in the paper is the design and implementation of the data acquisition system which includes a detailed description of the hardware and software utilized. (Author).
On the mechanics of magnetic amplifier operation
| Author | : Naval Research Laboratory (U.S.) |
| Publisher | : |
| Total Pages | : 26 |
| Release | : 1951* |
| Genre | : |
| ISBN | : |
Magnetic Field Response Measurement Acquisition System
| Author | : National Aeronaut Administration (Nasa) |
| Publisher | : |
| Total Pages | : 40 |
| Release | : 2020-08-05 |
| Genre | : |
| ISBN | : |
A measurement acquisition method that alleviates many shortcomings of traditional measurement systems is presented in this paper. The shortcomings are a finite number of measurement channels, weight penalty associated with measurements, electrical arcing, wire degradations due to wear or chemical decay and the logistics needed to add new sensors. The key to this method is the use of sensors designed as passive inductor-capacitor circuits that produce magnetic field responses. The response attributes correspond to states of physical properties for which the sensors measure. A radio frequency antenna produces a time-varying magnetic field used to power the sensor and receive the magnetic field response of the sensor. An interrogation system for discerning changes in the sensor response is presented herein. Multiple sensors can be interrogated using this method. The method eliminates the need for a data acquisition channel dedicated to each sensor. Methods of developing magnetic field response sensors and the influence of key parameters on measurement acquisition are discussed. Woodard, Stanley E. and Taylor, Bryant D. and Shams, Qamar A. and Fox, Robert L. Langley Research Center NASA/TM-2005-213518, L-19074 23-762-65-AT MAGNETIC MEASUREMENT; DATA ACQUISITION; SYSTEMS HEALTH MONITORING; MAGNETIC FIELDS; MULTISENSOR FUSION; RADIO FREQUENCIES
Developing a Low-noise Data Acquisition System for Detection of Electric and Magnetic Fields in Seawater
| Author | : Richard Allen Oare |
| Publisher | : |
| Total Pages | : 158 |
| Release | : 2016 |
| Genre | : Electric fields |
| ISBN | : 9781369044010 |
The Office of Naval Research (ONR) has taken an interest in developing a modular electric and magnetic field sensor and acquisition system that can be mounted on a small autonomous underwater vehicle (AUV). In this thesis, a fully integrated data acquisition system is presented, achieving low power dissipation and low cost. Analog signal amplification uses instrumentation amplifiers due to their inherently low noise characteristics, high input impedance, and ease of gain adjustment. Signal conditioning circuitry is used to provide an acceptable voltage range for an analog to digital converter (ADC). A microcontroller is used to connect to the ADC to provide data buffering and retrieval capabilities. Connected to the microcontroller is a low-power microprocessor to handle higher level applications and data storage. In addition, silver-silver-chloride (Ag/AgCl) electrodes are used as the sensors to detect electric fields in seawater.
A DIGITAL MAGNETIC TAPE SYSTEM FOR RECORDING RADAR DATA
| Author | : |
| Publisher | : |
| Total Pages | : 42 |
| Release | : 1967 |
| Genre | : Data tapes |
| ISBN | : |
A versatile multichannel medium-speed data system for recording radar data on magnetic tape directly in digital-computer format was designed for use with the Randle Cliff Radar facility at the Naval Research Laboratory's Chespeake Bay Division, and it is currently installed and operating there. Input data to the system can be analog voltages, which are internally digitized, or digital codes. Timing and reference data are internally generated. The system operates with three simultaneous data scanning rates: (a) basic (radar pulse repetition frequency), (b) submultiple, and (c) a multiple of the basic. Both the sequence and the amount of data sampled at each rate is patchboard-controlled. Any basic scan rate from 6 pulses per second to 3 kilo-pulses per second can be generated, depending on the volume of data. Data are recorded as sequential sevenbit characters at constant density, without intermediate storage, over the full range of trigger rates, through the choice of six tape speeds. Selected portions of the data can be monitored by an on-line printer and lamp display, during recording. Further checks can be made during playback of recorded tapes. The system has developed into an unusually successful preoperational monitoring device for itself and for nearly the complete radar system, in addition to being a versatile and dependable recording system. (Author).
Exploitation of a Ship's Magnetic Field Signatures
| Author | : John J. Holmes |
| Publisher | : Morgan & Claypool Publishers |
| Total Pages | : 79 |
| Release | : 2006 |
| Genre | : Magnetic fields |
| ISBN | : 1598290746 |
Surface ship and submarine magnetic field signatures have been exploited for over 80 years by naval influence mines, and both underwater and airborne surveillance systems. In this book, author John Holmes presents the generating mechanism of the four major shipboard sources of magnetic fields, along with a detailed description of the induced and permanent ferromagnetic signature characteristics.Holmes presents a brief historical summary of magnetic naval mine development during World War II followed by a discussion of important improvements found in modern weapons, including an explanation of the damage mechanism for non-contact explosions. This is followed by a brief historical discussion of underwater and airborne submarine surveillance systems and magnetic field sensing principles, in which mathematical formulations are presented for computing expected target signal strengths and noise levels for several barrier types.Also outlined is a multi-layered defensive strategy against naval mines, with graphical explanations of the relationships between ship signature reduction and minefield clearing effectiveness. Equations for estimating geomagnetic, ocean surface wave, platform, and vector sensor motion noises are presented along with simple algorithms for their reduction.
Magnetic Tape Operations on the Sound Laboratory Data Acquisition System
| Author | : A. James Baroody Jr. |
| Publisher | : Forgotten Books |
| Total Pages | : 76 |
| Release | : 2017-10-29 |
| Genre | : Technology & Engineering |
| ISBN | : 9780265932759 |
Excerpt from Magnetic Tape Operations on the Sound Laboratory Data Acquisition System: A Programmer's Reference Manual Read Status Indicator. Illuminated whenever the tape transport is on line, selected, and read selected. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
