Views:9 Author:Site Editor Publish Time: 2020-04-16 Origin:Site
Both night vision and thermal imaging can assist detecting, recognizing and identifying activity under poor vision situation. But how do these two differ and when should you choose one versus the other? This article will explain. Let’s begin with the basic physical principle. The light you can see, the sound from radio, X-ray used for medical test and energy used in microwave, is all one form of electromagnetic radiation.
As we can see, the visible spectrum—that is, light that we can see with our eyes—makes up only a small fraction of the different types of radiation that exist.Besides that part, it also exist infrared (IR) rays (also called “energy”/”heat”), Which is invisible but everything you see in normal daily life has a heat signature.
Thermal Vision Camera
Thermal vision camera can “see” the heat. It should be identified more as a sensor than a camera when we refers it.
Thermal imaging can see minute differences in heat and represent this as an image on a screen. Various colors are used to represent temperatures so when you see a black and white thermal image, the lighter the color, the hotter the object (newer thermal imagers can invert this or use a wide variety of colors). Human beings, animals and cars generate heat and are usually warmer than their surroundings, allowing the user of a thermal imaging to get a good look at them.
For example, if you are looking for a deer hiding behind the tree at night, thermal imaging would clearly show the deer’s body, as it’s heat is hotter than the near tree.
Besides, thermal imaging also has its limitations. As it’s image can only reflect the temperature difference, it only shows you a shape or called as a thermogram. you can not really know the figure, it’s your friend or enemy.
Night Vision Camera
Night vision camera, like the normal camera or the eyes , it can only operate with some visible light. Then magnify it greatly, and project that on a screen. Comparing with thermal imaging, it can provide a better image.
But the imaging performance of anything that relies on reflected light is limited by the amount and strength of the light being reflected. If there is not enough visible light or too much strong light, the performance suffers more. At dark night without additional light, night vision camera can not work.
Nowadays, both two technologies have been well developed and widely applied in different industries. You only need choose the appropriate one according to the needs.
Quanhom is the global provider dedicating in infrared optical industry. The product range includes thermal imaging, night vision imaging, infrared lens, eye piece and module. With it’s professional expertise team, it can provide solutions for complex challenges in defense, security and commercial applications.
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