Dr. Maciej A. Noras Profile

Dr. Maciej A. Noras

Associate Professor at Univ of North Carolina at Charlotte

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Author

Publications (5)

Proceedings Article | 4 June 2014 Paper

Electric-field sensors for bullet detection systems

Stephen Vinci, David Hull, Simon Ghionea, William Ludwig, Socrates Deligeorges, Thorkell Gudmundsson, Maciej Noras

Proceedings Volume 9082, 908205 (2014) https://doi.org/10.1117/12.2053901

KEYWORDS: Sensors, Electric field sensors, Acoustics, Weapons, Firearms, Signal to noise ratio, Detection and tracking algorithms, Signal processing, Environmental sensing, Signal detection

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Research and experimental trials have shown that electric-field (E-field) sensors are effective at detecting charged projectiles. E-field sensors can likely complement traditional acoustic sensors, and help provide a more robust and effective solution for bullet detection and tracking. By far, the acoustic sensor is the most prevalent technology in use today for hostile fire defeat systems due to compact size and low cost, yet they come with a number of challenges that include multipath, reverberant environments, false positives and low signal-to-noise. Studies have shown that these systems can benefit from additional sensor modalities such as E-field sensors. However, E-field sensors are a newer technology that is relatively untested beyond basic experimental trials; this technology has not been deployed in any fielded systems. The U.S. Army Research Laboratory (ARL) has conducted live-fire experiments at Aberdeen Proving Grounds (APG) to collect data from E-field sensors. Three types of E-field sensors were included in these experiments: (a) an electric potential gradiometer manufactured by Quasar Federal Systems (QFS), (b) electric charge induction, or "D-dot" sensors designed and built by the Army Research Lab (ARL), and (c) a varactor based E-field sensor prototype designed by University of North Carolina-Charlotte (UNCC). Sensors were placed in strategic locations near the bullet trajectories, and their data were recorded. We analyzed the performance of each E-field sensor type in regard to small-arms bullet detection capability. The most recent experiment in October 2013 allowed demonstration of improved versions of the varactor and D-dot sensor types. Results of new real-time analysis hardware employing detection algorithms were also tested. The algorithms were used to process the raw data streams to determine when bullet detections occurred. Performance among the sensor types and algorithm effectiveness were compared to estimates from acoustics signatures and known ground truth. Results, techniques and configurations that might work best for a given sensor platform are discussed.

Proceedings Article | 21 May 2014 Paper

Application of novel quasi-electrostatic sensor arrays for time based data collection and processing of supersonic, subsonic, and transonic revolving projectiles

Christopher Benfield, Wesley Williams, Maciej Noras

Proceedings Volume 9103, 91030H (2014) https://doi.org/10.1117/12.2050607

KEYWORDS: Sensors, Electric field sensors, Velocity measurements, Optical sensors, Standards development, Acoustics, Light sources and illumination, Firearms, Doppler effect, Error analysis

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Proceedings Article | 5 April 2007 Paper

Non-contacting electrostatic voltmeter for wafer potential monitoring

Maciej Noras, William Maryniak

Proceedings Volume 6518, 651843 (2007) https://doi.org/10.1117/12.707614

KEYWORDS: Sensors, Semiconducting wafers, Semiconductors, Spatial resolution, 3D vision, Silicon, Distance measurement, Metrology, Contamination, Electromechanical design

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Proceedings Article | 6 April 2006 Paper

Hysteresis characterization using charge feedback control for a LIPCA device

James Beck, Maciej Noras, Jerzy Kieres, John Speich, Karla Mossi, Kam Leang

Proceedings Volume 6170, 61701M (2006) https://doi.org/10.1117/12.658604

KEYWORDS: Control systems, Actuators, Amplifiers, Electrodes, Sensors, Data acquisition, Instrument modeling, Feedback control, Composites, Computing systems

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Proceedings Article | 27 March 2006 Paper

Use of a piezo-driven cantilever beam as a sensor for electrostatic voltmeter

Jerzy Kieres, Maciej Noras, William Maryniak

Proceedings Volume 6166, 616611 (2006) https://doi.org/10.1117/12.657969

KEYWORDS: Sensors, Actuators, Capacitance, Capacitors, Systems modeling, Laser beam diagnostics, Manufacturing, Copper, Feedback loops, Electrodes

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