Spatial resolutions and field-of-views in millimetre wave aperture synthesis security screening imagers

Neil A. Salmon

doi:10.1117/12.2502925

5 October 2018 Spatial resolutions and field-of-views in millimetre wave aperture synthesis security screening imagers

Neil A. Salmon

Proceedings Volume 10800, Millimetre Wave and Terahertz Sensors and Technology XI; 1080004 (2018) https://doi.org/10.1117/12.2502925
Event: SPIE Security + Defence, 2018, Berlin, Germany

Abstract

Aperture synthesis for passive millimetre wave imaging provides a means to screen people for concealed threats in the extreme near-field configuration of a walk-through portal; a regime where the imager to subject distance is of the order of both the required depth-of-field and the field-of-view. As shown here, the field-of-view in these scenarios is unlimited and the spatial resolution is slightly better than the half-wavelength Abbe microscope resolution. As in this scenario the subject would be surrounded by receiving antennas, all surfaces of the human body will be in focus with high-resolution, even at the low frequencies. For example at a frequency of 22.51 GHz the spatial resolution is in the region of ~ 7 mm. This capability is ideally suited to the aircraft security screening industry. Furthermore, the aperture synthesis imager is well suited to non-cooperate screening at longer ranges, as the antenna arrays may be deployed on almost any available surface. The field-of-view of these systems is likewise unlimited, extending from the near-field to the far-field. The spatial resolution of these systems, as here shown, is in the region of the half-wavelength resolution close to the imager, and slightly better than the Fraunhofer diffraction resolution limit at longer ranges. Therefore, also for the non-cooperate screening scenarios, the subject will always be in focus with the best possible spatial resolution allowed by the physics of imaging.

Conference Presentation

Citation Download Citation

Neil A. Salmon "Spatial resolutions and field-of-views in millimetre wave aperture synthesis security screening imagers", Proc. SPIE 10800, Millimetre Wave and Terahertz Sensors and Technology XI, 1080004 (5 October 2018); https://doi.org/10.1117/12.2502925

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