Best Long range cooled thermal camera
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13 سال پیش
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The M Series cooled MWIR
The M Series cooled MWIR Thermal imaging cameras offer very high sensitivity & high resolution at F4 continuous zoom lenses. The M Series Cooled MWIR thermal FLIR cameras are affordable while giving the user ultra long range standoff imaging performance up to 55 Kilometers.
www.x20.org
Cooled thermal camera lenses are needed for a thermal sensor to fulfill its ultimate purpose. Highly sensitive InSb and MCT sensors are only half of the equation. To truly leverage the power of cooled thermal sensors, you need a good lens. So, what makes a good lens? Like everything of quality in life there is no one data marker that you can point to and say; “oh well if it has that then it must be the best”. Rather, it is a combination of factors that determine a lenses quality. The main specifications of a thermal lens include: the lenses focal length, f/#, coating, alignment with the thermal sensor, size of the thermal sensor, pixel pitch of the thermal sensor, athermalization of the lens and environmental housing. That is a lot of factors. I am sure that you can now see that the question is not “what is the best cooled thermal lens” but “what is the RIGHT thermal lens for my needs”? So, with all these specifications to juggle how do I know what is the right thermal lens to choose? Lets start by looking at some of these options and figuring out what they mean.
FOCAL LENGTH- When discussing long range cooled thermal camera lenses, this is going to be the first specification you come across. Quite simply the focal length is the distance from the front of the optic to the point at the back where it focuses the energy that you are imaging. In the world of long range thermal imaging it is generally assumed that a longer focal length is used to see farther distances. A longer focal length will also result in a narrower field of view. So, with long lenses you can see farther away but you see a narrower area. For example (numbers made up for ease of calculation) if a 100mm lens could see a person at 1,000 meters and had a horizontal field of view of 15 degrees, then a 1500mm lens could see a person at 15,000 meter but would have a narrow horizontal field of view of only 1 degree. This makes it easy to see far but difficult to track targets closely. That is where the cooled thermal camera ZOOM lens comes in to play. For long range thermal surveillance, the right lens in this example would be a 100mm-1500mm continuous zoom optic. This type of cooled thermal camera zoom lens provides a 100mm FOV, a 1500mm FOV and every FOV in between. The thermal zoom lens makes it easy to select the perfect FOV for the target you need to track.
www.x20.org
COATING- All cooled thermal camera lenses are coated in order to perform properly and reduce unwanted stray energy. The basic anti-reflective coating is standard on all thermal lenses and is designed to eliminate that stray energy. Better lenses have whats called a DLC or HDLC coating. The Hard Diamond Like Coating of these lenses protects them from atmospheric pitting and blowing dust. In long range thermal imaging this matters. The size of these lenses usually means that the lens front element is exposed to the environment in the housing. The shear size of the lens prevents the use of IR transparent windows since they need to be so large and thick to cover the objective lens diameter. The quality of the coating is the most important thing to keep in mind.
http://www.x20.org
www.x20.org
Cooled thermal camera lenses are needed for a thermal sensor to fulfill its ultimate purpose. Highly sensitive InSb and MCT sensors are only half of the equation. To truly leverage the power of cooled thermal sensors, you need a good lens. So, what makes a good lens? Like everything of quality in life there is no one data marker that you can point to and say; “oh well if it has that then it must be the best”. Rather, it is a combination of factors that determine a lenses quality. The main specifications of a thermal lens include: the lenses focal length, f/#, coating, alignment with the thermal sensor, size of the thermal sensor, pixel pitch of the thermal sensor, athermalization of the lens and environmental housing. That is a lot of factors. I am sure that you can now see that the question is not “what is the best cooled thermal lens” but “what is the RIGHT thermal lens for my needs”? So, with all these specifications to juggle how do I know what is the right thermal lens to choose? Lets start by looking at some of these options and figuring out what they mean.
FOCAL LENGTH- When discussing long range cooled thermal camera lenses, this is going to be the first specification you come across. Quite simply the focal length is the distance from the front of the optic to the point at the back where it focuses the energy that you are imaging. In the world of long range thermal imaging it is generally assumed that a longer focal length is used to see farther distances. A longer focal length will also result in a narrower field of view. So, with long lenses you can see farther away but you see a narrower area. For example (numbers made up for ease of calculation) if a 100mm lens could see a person at 1,000 meters and had a horizontal field of view of 15 degrees, then a 1500mm lens could see a person at 15,000 meter but would have a narrow horizontal field of view of only 1 degree. This makes it easy to see far but difficult to track targets closely. That is where the cooled thermal camera ZOOM lens comes in to play. For long range thermal surveillance, the right lens in this example would be a 100mm-1500mm continuous zoom optic. This type of cooled thermal camera zoom lens provides a 100mm FOV, a 1500mm FOV and every FOV in between. The thermal zoom lens makes it easy to select the perfect FOV for the target you need to track.
www.x20.org
COATING- All cooled thermal camera lenses are coated in order to perform properly and reduce unwanted stray energy. The basic anti-reflective coating is standard on all thermal lenses and is designed to eliminate that stray energy. Better lenses have whats called a DLC or HDLC coating. The Hard Diamond Like Coating of these lenses protects them from atmospheric pitting and blowing dust. In long range thermal imaging this matters. The size of these lenses usually means that the lens front element is exposed to the environment in the housing. The shear size of the lens prevents the use of IR transparent windows since they need to be so large and thick to cover the objective lens diameter. The quality of the coating is the most important thing to keep in mind.
http://www.x20.org
13 سال پیش
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