Thermal imaging is also a type of night vision device, but it's vastly different from regular night vision devices! Thermal imaging passively captures infrared energy, which is radiated by all objects above zero degrees Celsius. The detected infrared light is defined and imaged based on the intensity of the radiation emitted by different objects at different temperatures. Various display modes are available, including the common white-hot, black-hot, and false-color.
Night vision devices actively capture images. They require an external light source to illuminate an object, which is then reflected by the device to form an image. The night vision device uses a front lens to focus ambient light (starlight, moonlight, or infrared light). This light, consisting of photons, enters a photon cathode ray tube, which converts the photons into electrons. Electronic and chemical processes amplify these electrons to a greater number. These electrons are then projected onto a screen, where they are converted back into visible light, visible through the eyepiece.
Comparing the advantages and disadvantages of thermal imaging and night vision devices: The advantage of night vision devices is that they can clearly identify the target and determine its exact appearance, whether it's a cat, a person, or a rabbit. Thermal imaging can only identify and pinpoint targets. It can detect the outline of a person or object and then determine its identity based on its behavior. If the target is not fully visible or is too far away, it will appear as a distinct dot on the display! Because thermal imaging uses temperature differences to create images, there is a risk of false targets! Thermal imaging is also significantly more expensive than night vision devices.
The advantages of thermal imaging are that it can clearly identify targets with large temperature differences, has a long range, can be used in complete darkness, can penetrate smoke, and is unaffected by strong sunlight. The disadvantages of night vision devices are that they cannot see far, require supplemental lighting in complete darkness, and cannot detect camouflage. This comparison of the advantages and disadvantages of thermal imaging and night vision devices should give you a good idea of the choice. The key factors are application and price. Of course, dual-light systems that combine both are a better choice!
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