J. D. Toews’s scientific contributions

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Publications (2)


Experimental time domain electromagnetic induction system
  • Article

July 1984

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10 Reads

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3 Citations

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R. H. Chesney

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Y. Das

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[...]

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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.


Citations (2)


... Training is the principal mechanism for modifying the human component of the system. However, while calls for developing new countermine machinery have been addressed, calls for a similar effort to "re-engineer" training 2,5,7 have only recently received attention. This project is part of this initiative. ...

Reference:

Information processing analysis of human land mine detection skill
Issues in the performance of metal detectors
  • Citing Article

... 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