Her Majesty the Queen in Right of Canada, As Represented by the Minister

Her Majesty the Queen in Right of Canada, As Represented by the Minister of National Defence

Ming Zhang

Harry Ing

Hugh Robert Andrews

Adrian W Alden

Salah Djeffal

Peter Bouliane

Carey L Larsson

A portable directional gamma ray radiation detector having a plurality of gamma ray radiation detectors separated by lead shielding arranged in an enclosure. Outputs from the detectors are applied to a signal processor to determine the location of a gamma ray emitter, and the signal processor is connected to a display device on the detector that indicates the direction to the gamma ray emitter.

Directional gamma ray probe

A method and apparatus for measuring an electromagnetic field are disclosed. In accordance with the apparatus an array of substantially identical antenna elements having a substantially shorter length than a wavelength of the electromagnetic field and being equi-spaced are provided. The spacing is larger than approximately three times the length of the antenna elements. Each antenna element is for sensing the electromagnetic field at a predetermined location and for providing a signal in dependence upon the sensed field. By providing antenna elements meeting the criteria set out herein accurate electromagnetic field strengths are measurable absent significant mutual coupling and scattering effects between the antenna elements.

Antenna array for the measurement of complex electromagnetic fields

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Ottawa, Canada

Ming Zhang