Thermal vision is a technology that enables the detection of objects and people in total darkness with the diverse condition of weather. If you ever notice videos or photos with the yellow and red mess, it’s called thermograph or commonly named thermal vision/imaging. The application is typically used for border security where most dangers occur at night. The use of thermal vision or thermal imaging is varied, depend on the scenarios.
What is the thermal vision?
In the simplest term, thermal vision allows you to see an object in total darkness. The thermal camera will record the temperature of a variety of objects in the frame, and after that, it will consign each temperature a color shade. Green, purple or blue color shade comes from colder temperature while yellow, orange, or red comes from warmer temperature. Some cameras with thermal vision technology generally utilize a grayscale as an alternative such as a police helicopter that uses grayscale to stand out criminal suspects.
How does it work?
Thermal vision is detecting temperature by capturing and recognizing diverse levels of infrared illumination. This type of light is unseen to the naked eye, but you can feel the heat when the intensity is sufficiently high. The focused light is scanned and obtained by the thermogram to translate electric impulses. The impulses then are transferred to a special signal-processing part. The part then sends the information and displays it in various colors.
All objects emit some infrared radiations, and the heat is transferred. The hotter the objects, the more infrared radiation it generates. This radiation is visible to the camera and then it is converted into a visible image that can see through your eyes. Theoretically, thermal vision can be a type of night vision technology. On the other hand, thermal vision is able to capture longer infrared wavelengths to detect heat. The heat then is used to produce an image. It means that thermal vision can be utilized in absolute darkness as well as allowing you to see throughout camouflage, foliage, light fog, dust, and even smoke.
Types of Thermal vision
Most devices of thermal vision can scan about thirty times per second. The temperature ranges that can be sensed are at around minus twenty degrees to two thousand degrees Celsius. It can also normally detect the temperature alterations of around 0.2 degrees Celsius. In fact, there are 2 common thermal vision devices types.
- Cryogenically cooled
This thermal vision system equipped with sealed components inside a container that will cool them to below zero degrees Celsius. The system is able to see more than three hundred meters away at distance. The most amazing feature of this thermal vision type is its sensitivity and resolution that develop from the cooling components.
Un-cooled is considered as the most common thermal vision device. The elements of infrared-detector are attached in a unit which is operated at room temperature. The system is typically silent, activates instantly and a built-in battery includes.