infrared camera principle
What is the difference between day-night cameras and IR (infrared) camera?
What are the different types of day-night cameras available! And what is the their different operating principles?
All types of network fixed cameras, fixed dome, PTZ, and PTZ dome can offer day and night functionality. A day night camera is designed to be used in outdoor installations or in environments with poor indoor lighting. A day and night, color network camera provides color images during the day. When light falls below a certain level, the camera automatically switches to night mode using near-infrared (IR) light to deliver high quality, black-white images. Near-infrared light, which ranges from 700 nanometers (nm) to about 1000 nm, is what the human eye can see, but most camera sensors can detect and use it. During the day, one days and night camera uses an IR-cut filter. IR light is filtered so it does not distort the colors of images as the human eye sees them. When the camera in the night (black-white) mode, The IR-cut filter is removed, allowing light sensitivity of the camera to come down to 0001 lux or less. A thermographic camera, sometimes a FLIR (Forward Looking InfraRed), or an infrared camera less specifically, is a device that forms an image using infrared radiation, similar to a common camera that forms an image using visible light. Instead of the 450-750 nanometer range of the visible light camera, infrared cameras operate in wavelengths as long as 14,000 nm (14 microns). Infrared energy is only part of the electromagnetic spectrum includes gamma radiation, X-rays, ultra violet, a thin region of visible light, infrared, terahertz waves, microwaves and radio waves. These are all related and differentiated in the length of their wave (wavelength). All objects emit a certain amount of black body radiation as a function of temperature. Generally, the higher temperature of an object is, the more infrared radiation as black-body radiation it emits. A special camera can detect this radiation in a manner comparable with an ordinary camera does visible light. It works even in total darkness because ambient light level does not matter. This makes it suitable for rescue operations in smoke-filled buildings and underground. Images from infrared cameras are usually monochromatic because the cameras are generally designed with only a single type of sensor responds to a wavelength of infrared radiation. Color cameras require a more complex construction to differentiate wavelength and color has less meaning outside the normal visible spectrum because different wavelengths are not evenly card in the system of color vision used by humans. Sometimes these monochromatic images are displayed in pseudo-colors, where changes in color are used instead of changes in the intensity of changes in the signal display. This is useful because although humans higher dynamic range intensity detection than color in general, is the ability to fine intensity differences in bright areas show quite limited. This technique is called density slicing. For use in temperature measurement the brightest (warmest) parts of the image are usually colored white, red and yellow intermediate temperatures, and the weakest (coolest) parts blue. A scale should be an addition displaying false color image color temperature concerns. Their resolution is considerably lower than of optical cameras, mostly only 160x120 or 320x240 pixels. Thermo Graphic cameras are much more expensive than their counterparts visible spectrum, and higher-end models are often regarded as dual-use and export-restricted. Uncooled detectors in the temperature minutes on the sensor pixels, January 1 ° C difference at the scene induces only a 0.03 ° C difference in the sensor. The pixel response time is also rather slow, the range of tens milliseconds. Thermal imaging photography finds many other applications. For example, firefighters use to see through smoke, find persons, and localize hotspots of the burn. With thermal imaging, power line maintenance technicians locate overheating joints and parts, a sentinel sign of their failure to eliminate potential hazards. When thermal insulation breaks down, technicians can see heat leaks construction improve the efficiency of cooling or heating air-conditioning. Thermal cameras are also installed in a number of luxury cars to aid the driver, the first is the 2000 Cadillac DeVille. Some physiological activities, particularly responses, in human beings and other warm-blooded animals can also be monitored with thermographic imaging. Cooled infrared cameras can also be found at most major astronomy research telescopes.
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