R. H. Chesney’s research while affiliated with Defence Research and Development Canada and other places

What is this page?


This page lists works of an author who doesn't have a ResearchGate profile or hasn't added the works to their profile yet. It is automatically generated from public (personal) data to further our legitimate goal of comprehensive and accurate scientific recordkeeping. If you are this author and want this page removed, please let us know.

Publications (12)


Experimental time domain electromagnetic induction system
  • Article

July 1984

·

10 Reads

·

3 Citations

·

R. H. Chesney

·

Y. Das

·

[...]

·

M. Bell

An automated system which measures, coherently averages, and stores time domain electromagnetic induction responses of conductive objects and allows on‐line analysis of the data is described. The sensor portion of the system consists of a set of coils, transmit and receive circuitry situated in a remote nonmetallic laboratory. The circuitry is controlled by a specialized high‐speed data‐acquisition system which communicates, through a microcomputer, with a distant mainframe computer. Advanced inductive load switching techniques are employed and errors due to temperature variations in the coils are minimized by suitable sensor design. The user can change date‐collection parameters, such as pulse length, dwell time, and transmitter waveform shape, under program control to tailor the system to a particular application. The design also allows for easy replacement of the sensor elements; i.e., coils, receive and transmit circuitry as different applications require. This flexibility allows the system to be readily adapted for research in a number of areas that rely on measurement of electromagnetic induction responses. A typical response may be obtained in less than 1 min. The minimum time resolution of the system is 4 μs. Noise levels of 3 to 5 mV standard deviation are obtainable for 500 averages. Data are presented to demonstrate the capabilities of the system.


Identification of Metallic Spheroids by Classification of Their Electromagnetic Induction Response
  • Article
  • Full-text available

January 1984

·

65 Reads

·

7 Citations

Download

Citations (10)


... A single unit was constructed to be part of the original DRDC-designed POC vehicle-mounted mine detector system, then called ILDP. 2 The requirements imposed by the application had a significant impact on the design. Beyond the obvious constraints of size, mass and power consumption, the two most significant requirements were interrogation time and field of view (FOV). ...

Reference:

Improved thermal neutron activation sensor for detection of bulk explosives
Multisensor vehicle-mounted teleoperated mine detector with data fusion
  • Citing Article
  • January 1998

Proceedings of SPIE - The International Society for Optical Engineering

... The team of DRDC started in 1997 a project testing the combination of various detection technologies called Improved Landmine Detector Project ILDP. Since a single detection technique will not be able to detect all types of landmines in all conditions, the fusion of various techniques can be more effective [29], [30]. The authors tested a small teleoperated vehicle carrying four types of detectors: Forward Looking Infrared imager, down looking electromagnetic induction detector, down-looking Ground Penetrating Radar (GPR) and finally a thermal neutron activation detector used as confirmatory detector of suspected targets. ...

The Canadian Forces ILDS - A militarily fielded, multi-sensor, vehicle-mounted, teleoperated landmine detection system - art. no. 62172G

Proceedings of SPIE - The International Society for Optical Engineering

... The secondary field depends on many factors: the conductivity and permeability of the object and of the background, the size and the shape of the object, its geometry (distance, orientation) and the temporal and spatial distribution of the primary field [23]. It can be shown that the influence of the target's dielectric properties are negligible in the frequency range used by mine searching metal detectors, which is between 1 and 100 kHz [16]. ...

Identification of Metallic Spheroids by Classification of Their Electromagnetic Induction Response

... The assumption of is-axis symmetry further reduces the number of independent nonzero elements to 6. These are: 14 -isi = M II33 (3) (0 ,in 33 (84) So far the analysis has applied to any axially symmetric body with fore-aft symmetry. Now assume that the body is a spheroid and that the diameter of the spheroid along the symmetry axis is 2ae and the diameter of the largest axis orthogonal to the symmetry axis is 2a. ...

Experimental time domain electromagnetic induction system
  • Citing Article
  • July 1984

... The role of pattern recognition methods such as machine learning and target feature extraction, as an alternative to inversion, is gaining rapid acceptance in areas such as unexploded ordnance (UXO) and landmine detection. An important early paper in classification of buried spheroids by their CSEM response is by Chesney et al. (1984). It would be interesting to explore whether such concepts can be applied to hydrogeophysical settings in which the subsurface target is not necessarily an isolated, well-defined man-made object but instead could be a subtle, finely-distributed and irregular variation in the subsurface electrical conductivity distribution. ...

Identification of Metallic Spheroids by Classification of Their Electromagnetic Induction Responses

IEEE Transactions on Pattern Analysis and Machine Intelligence

... In order to address the latter, a smaller system with different sensors was proposed. Therefore, using a high mobility robotic platform, the authors proposed a system that contains five separate technologies: 2 hyperspectral cameras (thermal infrared (TIR) and VNIR), a scanning sensor imaging system which is mounted on a custom built articulated robotic scanner, and a nuclear confirmation sensor [31]. The role of each technique is as follows:  Forward looking SWIR or TIR cameras should detect thermal contrast between a landmine and its surroundings. ...

Canadian Teleoperated Landmine Detection Systems. Part Ii: Antipersonnel Landmine Detection.

International Journal of Systems Science

... The use of neutrons for detection and characterization of explosives has been extensively studied [1][2][3] especially for their detection in vehicles [4], air cargo [5] and for humanitarian demining [6][7][8]. In an Explosives Detection System (EDS) based on thermal neutron activation (TNA), a neutron source is used to activate an unknown sample to detect the scattered neutron and gamma signals which are used as signatures for material identification as well as to estimate the quantity of a concealed explosive. ...

Canadian teleoperated landmine detection systems. Part I: The improved landmine detection project

International Journal of Systems Science

... The switching on and off of a current in a loop, which is a rectangular pulse and is known as the time domain electromagnetic method [35], has been used for detection of metallic spheroid-like objects in soil [33]. The time domain EMI response of aluminum and steel spheres below a receiver coil and transmitter coil and excited by a rectangular waveform was investigated in [36]. In other work, the pulsed induction method, which uses a rectangular voltage pulse, was used to detect buried subsea pipelines and cables [37]. ...

Time Domain Response of a Sphere in the Field of a Coil: Theory And Experiment

IEEE Transactions on Geoscience and Remote Sensing

... To determine the size, an approximate distance from the located object should be known. In [27] or [28], it is shown how to estimate the depth of a located object. The results presented in Table 6 concern the similar distance from the detector head. ...

Determination of Depth of Shallowly Buried Objects by Electromagnetic Induction

IEEE Transactions on Geoscience and Remote Sensing