Millimetre-Wave Detection Device for Discriminating Between Different Materials
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Abstract
The detection device that can be used for detecting objects behind clothing etc including a dielectric lens and a receive element sensitive to millimetre wave radiation. Prior art systems produce an image of a scene usually using scanning optics. This can be large and expensive. The present invention instead takes spot readings from different parts of a scene without building up an image. The spot readings are processed, and an indication given to a user if certain characteristics of the readings are observed. Typical characteristics used are the differences in absolute received power level, and the power level at different polarisations. Such characteristics are typically present is an object of interest is in the scene. Also disclosed are various methods of altering the received beam to get readings from different areas from the scene, such as changing the beam width, or beam angle.
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Citations
55 Claims
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1-27. -27. (canceled)
- 28. A detection device for discriminating between different materials comprising an antenna system and a receiver wherein the receiver is sensitive to millimetre-wave radiation, the antenna system is arranged provide incident energy from a scene to the receiver, and the device is adapted to measure the power of a received signal at different times and further adapted to include a system for changing an incoming direction of the incident energy to allow measurements from different parts of the scene, and to provide an indication based on the measurements without using said measurements in the formation of an image of the scene.
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49. A method of detecting objects present in a scene by means of receiving millimetre wave radiation from the scene through a redirector for redirecting an incoming direction of the radiation, wherein:
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a first measurement is made of radiation from a first part of the scene using the redirector; a further measurement is made of radiation from a second part of the scene using the redirector wherein the second part of the scene may overlap with the first part of the scene; and an indication is provided if characteristics of the first measurement are different to characteristics of the further measurement without using said measurements to form an image of the scene. - View Dependent Claims (50, 51, 52, 53, 54)
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55. A detection device for discriminating between different materials comprising an antenna element and a receive element characterized in that the receive element is sensitive to millimeter-wave radiation, the antenna element is arranged to provide incident energy from a scene to the receive element, and the device is adapted to measure the power of a received signal at different times and further adapted to include optics for changing the beamwidth of the antenna to allow measurements from different sized parts of the scene, and provide an indication based on the measurements, without using said measurements in the formation of an image of the scene.
Specification