19 May 2005 A compact, low-cost, passive MMW security scanner
Author Affiliations +
We describe a low-cost passive millimeter wave (MMW) scanning camera for detecting concealed weapons and contraband. It is based on a focal plane array of 64 radiometric channels that employ MMICs operating at 94 GHz. Equipped with a 125 mm primary optic, the camera achieves a 26 26 degrees field of view by means of a rotating optic that performs 10 conical scans of the scene per second. The resulting 10 Hz rate images are of size 28 by 28, yielding a spatial resolution of 5 cm at a range of 1.6 meters from the camera. The radiometric sensitivity, at the maximum frame rate, is given by a median of under 3 Kelvin. With a size of 8 in. 8 in. 22 in. and a weight of 26 lbs., the camera is very compact and portable. This development may constitute the first affordable, commercially available passive MMW scanning camera. When operated at the slower frame rate of 1 Hz, the resulting time integration improves the image to less than 1 Kelvin, making the camera well suited for the detection of a wide variety of threats at security checkpoints. At finer camera sensitivity levels, the possibility arises of the exposure of anatomic details of the scanned subjects. In view of this, we have developed specialized display software that allows the presentation of the MMW scanning results in a manner that overcomes privacy concerns.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Thomas D. Williams, Thomas D. Williams, Nitin M. Vaidya, Nitin M. Vaidya, } "A compact, low-cost, passive MMW security scanner", Proc. SPIE 5789, Passive Millimeter-Wave Imaging Technology VIII, (19 May 2005); doi: 10.1117/12.603662; https://doi.org/10.1117/12.603662


Passive three-colour submillimetre-wave video camera
Proceedings of SPIE (May 30 2013)
Electro-Optical Imaging For Film Cameras
Proceedings of SPIE (December 10 1984)
Galileo a modular mid and long wave infrared...
Proceedings of SPIE (June 15 1997)

Back to Top