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Published byEmerald Mathews Modified over 9 years ago
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Infrared Technology
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-W HAT IS AN I NFRARED C AMERA ? -I NFRARED S PECTRUM -L ONG AND M ID W AVELENGTH I NFRARED -T HERMAL A DVANTAGE - I NFRARED I MAGING A PPLICATIONS
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W HAT IS AN I NFRARED C AMERA ? A camera that sees part of the electromagnetic spectrum that is invisible to humans -- it sees heat, NOT light. Best at detecting humans and vehicles. Thermal Imaging: 8-12 m Visible light:.4 m -.7 m Infrared: 0.7 m - 20 m Cosmic Rays Gamma Rays X-rays Ultraviolet (UV) Infrared (IR) Microwaves Radar RadioBroadcast Band Ultraviolet (UV) Visible Light Infrared (IR) Short Wavelengths Long Wavelengths 1 Nanometer1 Micron1 Millimeter1 Meter1 Kilometer
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I NFRARED S PECTRUM LWIR Thermal Camera 8 – 12 um The earths atmosphere only transmits some wavelengths of light, other wavelengths are absorbed. Visible Camera Night Mode operates out to 1000nm (1 um) Visible Cameras Visible Light Spectrum 400 – 750 nm (0.4 to 0.75 um)
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Any object at a temperature > absolute zero will emit radiation but the wavelength of the emitted radiation depends on the temperature.
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L ONG AND M ID W AVELENGTH I NFRARED MWIR (Mid-Wave Infrared) cameras use the 3-5 m band Known as MWIR (Mid-Wave Infra-Red). Used to measure high temperatures (>250 o C). Much more sensitive, long range. Require coolers (maintenance). Are expensive. LWIR (Long-Wave Infrared) cameras use the 8-12 m band No cooler, almost no maintenance Used to measure temperatures from -10 o C to 250 o C Much less expensive Optimized for detecting people and vehicles.
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K EY DIFFERENCE : T HERMAL VS. V ISIBLE Visible Cameras Require Illumination Thermal Cameras Require NO Illumination Reflected Light Radiated Heat
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Infrared Imaging Works in Tough Environmental Conditions Advantages over standard cameras include: – See in complete darkness – See through obscurants (smoke, dust, haze, etc.) – See through particulates (fog, rain, snow)
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Thermal Advantage: Avoid Glare Thermal imagers see heat, not light This means they are not effected by bright lights like : standard cameras. They work equally well day and night Important: This is not just a night- time technology!
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E XAMPLE : H EAT F LOW IN S ERVERS
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Example: Liquid Levels in Tanks
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Example: Airport Operations Visible Camera View Thermal Camera View
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Thank you
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