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The difference between infrared thermal imaging and night vision devices

The difference between infrared thermal imaging and night vision devices

2021-07-23 10:33:40
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What is the difference between thermal imaging and night vision devices? I believe a lot of people do not know, so let's check it out!


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The reflected light, solar cameras, night vision equipment and the human eye follow the same principles: visible light energy hits and reflects, and the detector receives and transforms it into images. Both in the eye and in the camera, these detectors have to receive enough light to image. Apparently no sunlight can reflect anything at night, so they are limited to the light provided by starlight, moonlight and artificial light. If they were not enough, they will be of no avail.

 

Infrared thermograph

 

Infrared thermal imagers are completely different from ordinary cameras, and although we call them "cameras," they are actually sensors. The first thing you have to is to forget all the knowledge of your previous camera photography.

 

A thermal camera integrated with ZIP's infrared thermal core takes pictures through thermal rather than visible light. Heat (also known as infrared or thermal) and light are both part of the electromagnetic spectrum, but cameras that can detect visible light do not see the heat, and vice versa.

 

The thermograph not only detects heat, but also detects very small heat differences (as low as 0.01 °C) and displays them as either shades of grey or different colors. A lot of people just don't understand the concept, and here let's explain its principle.

 

Everything we encounter in our daily life releases heat, or even ice. The hotter things get, the more heat it emits. The heat energy emitted is called a "thermal signal". When the thermal features of the two objects adjacent to each other are slightly different, they show very clear to ZIP INFRARED regardless of the light conditions. Heat energy comes from multiple energy sources, depending on what you looked at then. Some things, such as warm-blooded animals (including humans), engines and machinery, generate their own heat bioor mechanically. Other things-land, rocks, buoys, vegetation absorb solar heat during the day and emit heat at night.

 

Since different materials absorb and radiate heat energy at different rates, we consider it to be a region of temperature, actually having subtle differences between different temperatures. That is why the temperature of the wood soaked in water for several consecutive days looks different from the water temperature.... It is therefore visible for a thermal imager.  Thermal cameras integrated with ZIP thermal imaging core can detect these temperature differences and convert them into images. While all of these seem a bit complicated, the reality is that the thermal camera is very easy to use. Their images are clear and easy to understand, without training or explanation.

 

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Night vision

 

Those green images we see in movies and TV are from the Night Vision Mirror (NVG). The NVG absorbs a small amount of visible light, enlarges it a lot, and then projects it onto the display.

 

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Cameras made from NVG technology have the same limitations as with the naked eye: they would not look well without enough visible light. The imaging performance of anything that depends on the reflected light is limited by the amount and intensity of the reflected light. NVG and other microlight cameras are not very useful at dusk because they have too much light to work effectively, but do not see enough light to the naked eye. Thermal images are not affected by visible light, so they can give you clear images even in the setting sun.

 

Infrared lighting camera

 

The infrared lighting camera attempts to project a beam of near-infrared energy to produce its own reflected light, and its imager is visible as it rebounds from the object. This is feasible, but the cameras still need to rely on reflected light for imaging, so they have the same limitations as other night vision cameras as short distance and poor contrast.

 

Comparison

 

All of these visible light cameras (daylight cameras, NVG cameras, and infrared lighting cameras) work by detecting reflected light energy. However, the amount of reflected light they receive is not the only factor to determine whether you can see with these cameras: image contrast is also important.

 

If what you re looking at has a great contrast to your surroundings, you have more opportunities to see it with a visible light camera. Without a good contrast, then you won't see it clearly, no matter how bright the sun is. White objects seen on a dark background have much contrast, however, darker objects will be difficult to see with these cameras in dark environments, which is poor contrast. At night, when the lack of visible light naturally reduces the image contrast, the performance of visible light cameras decreases much.

 

The imaggraph does not of these drawbacks. First, they are independent of the reflected light energy, and in everyday life everything you see has a thermal signal. That is why there is a much greater chance of using thermal imagers to see things at night than by using a visible light camera (or even a night view camera).

 

In fact, many objects you might be looking for (for example people) produce their own contrast because they produce their own heat. Thermal images see them well because they can take images not only through thermal energy but also, and they use the tiny heat differences between objects to take photos. Night vision devices have the same disadvantages as daylight and low-illumination cameras: they require enough light and enough contrast to create available images. And the thermal imager, on the other hand, can be clearly observed during day and night, while creating its own contrast. Undoubtedly, the thermograph is the best 24-hour imaging option.

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