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| Highlights from the April 2012 issue of Photonics Spectra | |
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| Connected and Smarter, Cameras Keep Watch |
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Fading fast are the days of closed-circuit television, yesterday’s video surveillance staple that displays the output of analog cameras on monitors. Today, the trend is toward network cameras, which are Internet protocol (IP)-based and digital. They offer megapixel and high-definition resolution. They also are increasingly intelligent, able to extract and transmit only what is important in a scene. As a result, they can do double or triple duty.
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| Conscripting Terahertz Sensors |
Terahertz waves are short enough to provide resolution of less than 1 mm, yet long enough to penetrate most nonmetallic substances, such as the materials used to make clothing, rucksacks and tarps. As such, they are useful to security agents and military personnel alike for revealing concealed weapons, chemical explosives and biological agents. Besides security applications such as airport screeners, higher-resolution terahertz sensors could provide enhanced identification of battlefield targets, better missile guidance and other combat advantages.
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| Multiband Optical Filters Find Applications Outside Fluorescence |
In the past, most optical filters had a single transmission or blocking band at a particular wavelength. But today, the demand for multiband filters is surging in many areas of application. The benefits of multiband dielectric filters go beyond well-known fluorescence applications to providing a new dimension to entertainment, studying the universe and connecting us to the Internet.
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| The Night Glows Brighter in the Near-IR |
Imaging in very low light requires extra sensitivity and image fusion. Spectral irradiance, caused by airglow, is several times stronger in the 900- to 1700-nm band than in the visible realm. This makes the near-IR band the best choice for night-vision applications. For handheld systems, size and power consumption of the camera engine are almost as important as its performance.
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| How to Evaluate a Measurement Application’s Requirements |
The competing requirements for the most challenging measurement applications in industry and other technical endeavors can be daunting when their complexity takes the design or application engineer into territory that is “uncharted” in his or her experience. This is especially the case when 3-D high-precision measurement or sensitive multispectral measurement requirements are part of the application picture.
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| Defense, Security Show Targets Baltimore |
At the mention of Baltimore, certain things come to mind: crab cakes, the Orioles, Camden Yards, Edgar Allan Poe’s grave and, now, defense and security technologies. SPIE will host its popular annual conference and exhibition Defense, Security and Sensing in the Charm City this year – specifically, April 23-27 at the Baltimore Convention Center.
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Join Us for a Free Webinar
2012 Webinar Series - Expert Briefings
Photonics in Defense and Security
Thursday, April 19, 2012 - 1 p.m. EDT/ 10 a.m. PDT/ 5 p.m. GMT/UTC
 Photonics Media will host Dr. Hooman Mohseni, associate professor, Electrical Engineering and Computer Science Department, Northwestern University. Dr. Mohseni will present "Novel Infrared Sensors for Medical, Industrial, and Homeland Security Applications."
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