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Published byBertram Moore Modified over 9 years ago
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INFRARED CAMERAS Research Experience for Teachers Paul Longwell Summer 2004
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What does Infrared mean? Infrared is the name given to radiation that has a wavelength just beyond what our eyes can detect.
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Types of Infrared Very Near IR Near IR Medium IR Far IR Very Far IR Image Courtesy of NASA Image Courtesy of National Infrared
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What is special about an Infrared Camera? Our eyes use visible wavelengths to create images. An infrared camera is sensitive to wavelengths that are longer. Image courtesy of FLIR Inc.
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Same Object – Different Images! Infrared Camera Human Eye Image Courtesy of NASA/IPAC
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Infrared Imaging Begins With Bolometers… Think of bolometers as resistors that are temperature-sensitive. Image Courtesy of PSU/EOC
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When an object’s infrared radiation strikes a bolometer… The resistance of the bolometer changes, and this is detected by a electronic circuit. Image Courtesy of PSU/EOCEnhanced Image Courtesy of PSU/EOC
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Bolometer Technology Gets Moo-ving In 1901, S.P. Langley demonstrated that his primitive bolometer could detect a cow that was standing out in a field!
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Bolometers are not big! Each side of a bolometer is usually 0.005 centimeters wide. A row of 1000 bolometers would cover a distance of only 5 cm! Image Courtesy of PSU/EOC
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Before being used in cameras, bolometers must first be tested… Sometimes they fail! Image Courtesy of PSU/EOC
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Each bolometer helps form one pixel of an image… More Pixels = More Bolometers
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A typical array of bolometers contains 240 rows and 320 columns Measurements from each bolometer must be collected separately
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Once assembled, the bolometer array can be put in a camera. The lens focuses the image on the bolometer
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An infrared camera requires an infrared lens! Germanium is used instead of glass: Infrared radiation passes right through, but visible light does not. Image Courtesy of PSU/EOC
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Need a small IR camera? Image Courtesy of PSU/EOC
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This is truly a cool camera! This camera’s detector must be kept cold with liquid nitrogen! Image Courtesy of PSU/EOC
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Cooled Cameras Are more expensive Perform better Image Courtesy of PSU/EOC
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Miniature Uncooled IR Camera Standard Uncooled IR Camera Standard Cooled IR Camera Images Courtesy of PSU/EOC
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MRTD Test Minimum Resolvable Temperature Difference An image like this is produced by placing a room- temperature faceplate (w/ slits) over a heated background. The background temperature is brought closer and closer to the faceplate temperature until the image cannot be clearly seen. Image Courtesy of PSU/EOC
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Applications: Image Courtesy of PSU/EOC Examine structures behind walls and floors.
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Applications Light Switch Image Courtesy of PSU/EOC Locate wires behind walls.
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Applications Image Courtesy of National Infrared Analyze electrical systems. Image Courtesy of National Infrared
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Applications Evaluate home heat loss. Image Courtesy of National Infrared
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Applications Animal Science Image Courtesy of National Infrared
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Applications Detect recent activity Image Courtesy of National Infrared Image Courtesy of Infrared1
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Thanks! Penn State University – Applied Research Laboratory (ARL) Electro-Optics Center, Kittanning PA Ken Freyfogle Wendy Gilpin Chuck Rapach Image Courtesy of SE-IR Corp.
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