| | | | | | | | | | Linear Avalanche Photodiodes Enable Single Photon Sensors
| | | By
Leye Aina, Harry Hier, and Ayub Fathimulla, Epitaxial Technologies LLC
,
Sachi Babu, NASA Goddard Space Flight Center (GSFC)
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Jim Foshee, Air Force Research Laboratory, Sensor Directorate (AFRL/RYTD)
| | | Single photons are elementary particles that are arguably the most tangible, yet some of the most difficult to detect and characterize as single entities. Techniques to count single photons require optical detectors with linear operation, high gain, wide bandwidth and low noise. This article will describe a variety of approaches to detect and count single photons, the key measurement metrics, and potential applications of single photon sensors.
| | | Finding the Right Pressure Switch
| | | By
Michael F. Horn, Whitman Controls Corp.
| | | Selecting a pressure switch that is well suited for a particular application is a multi-faceted process. The trick is to know what questions to ask to optimize your application.
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| | | | Monitoring Temperature in a Geothermal Bridge
| | | By
Craig Borax, Tidal Engineering
| | | A Canadian bridge uses a novel technique to keep its roadbed clear of black ice. Designers testing the concept chose an Internet-enabled DA system to allow them to track the multiple temperatures and strains involved.
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| | | | Mel’s Picks April 2008
| | | By
Melanie Martella
| | | Vibration Application Notes, Control Tutorials for Matlab, The Past in Photos
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