File:NIKE_AJAX_Anti-Aircraft_Missile_Radar3.jpg
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DescriptionNIKE AJAX Anti-Aircraft Missile Radar3.jpg |
English: The antenna of the MPA-4 target tracking radar used with the US Air Force MIM-3 Nike Ajax anti-aircraft missile, the US's first anti-aircraft missile, in service from 1954 through the 1960s. It is a lens antenna, composed of a round lattice of parallel strips of metal of various thicknesses, in the form of a Fresnel lens. Microwaves from a feed horn below pass through the lens, which focuses them into a parallel beam which tracks the target aircraft.
DSCN1610It functions similarly to a convex optical lens, slowing the velocity of the waves passing through the center, while increasing the velocity of the waves through the periphery. The spaces between the strips act as waveguides of various widths. However in a converging optical lens the glass slows the speed of the waves, so the lens is made thicker in the center than the edges. In this microwave lens the waveguides actually increase the speed (phase velocity) of the microwaves, and thus have an index of refraction less than one, so to make a converging lens it must have a concave shape, thicker in the peripheral regions and thinner in the center. For more information see IFC-Tracking Radars page, Ed Thelen's Nike Missile website |
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Date | |||
Source | Flickr: NIKE AJAX Anti-Aircraft Missile Radar | ||
Author | brewbooks | ||
Permission (Reusing this file) |
This file is licensed under the Creative Commons Attribution-Share Alike 2.0 Generic license.
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Items portrayed in this file
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27 March 2008
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 20:10, 17 February 2012 | 3,072 × 2,304 (1.08 MB) | Flickr upload bot | Uploaded from http://flickr.com/photo/93452909@N00/2367040509 using Flickr upload bot |
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Camera manufacturer | NIKON |
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Camera model | COOLPIX L5 |
Exposure time | 2/279 sec (0.007168458781362) |
F-number | f/3.1 |
ISO speed rating | 79 |
Date and time of data generation | 13:42, 27 March 2008 |
Lens focal length | 7.5 mm |
Orientation | Normal |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | COOLPIX L5V1.0 |
File change date and time | 13:42, 27 March 2008 |
Y and C positioning | Co-sited |
Exposure Program | Normal program |
Exif version | 2.2 |
Date and time of digitizing | 13:42, 27 March 2008 |
Meaning of each component |
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Image compression mode | 2 |
Exposure bias | 0 |
Maximum land aperture | 2.9 APEX (f/2.73) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Color space | sRGB |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 0 |
Focal length in 35 mm film | 45 mm |
Scene capture type | Standard |
Scene control | Low gain up |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |