29 April 2009 Design of a high-resolution passive millimeter-wavelength camera for security applications
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We discuss the methods and design considerations required in engineering a high-resolution camera for use at 94 GHz (~3mm wavelength) to yield the best compromise between optical resolution, field of view, object distance, depth of focus, image acquisition time, and system cost. This application is one in which only the blackbody radiation emitted by the body is a light source, i.e., a passive system. Several critical design parameters were optimized in this design, including, the point spread function size upon the detector array, optical losses, and depth of focus. The metric for characterization of the optical design was the Huygen's wavelet calculation that correlated well with measured performance. Measurements of the PSF and MTF agreed with the model within measurement error. Sample imagery of hidden objects demonstrate that this prototype design is capable of resolving objects with feature sizes as small as 0.50 inch and further show the utility of this millimeter wavelength camera.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jonathan Drewes, Robert P. Daly, "Design of a high-resolution passive millimeter-wavelength camera for security applications", Proc. SPIE 7309, Passive Millimeter-Wave Imaging Technology XII, 73090B (29 April 2009); doi: 10.1117/12.819364; https://doi.org/10.1117/12.819364

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