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What is the difference between a night vision camera and a thermal imager

What is night vision? Most of us have seen night vision devices on TV or movies, and some hunters have direct experience in using night vision devices. But many people don’t know the difference between different types of night vision goggles. Let’s learn it below: 

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It is generally believed that night vision devices are divided into three types: image enhancement night vision devices, digital night vision devices, and thermal imaging night vision devices.

What is the working principle of night vision? Traditional night vision devices generally use infrared light, starlight or moonlight that cannot be directly seen by the human eye, and use an image intensifier to enhance a visible image visible to the human eye on a fluorescent screen to observe and aim at the target. This kind of night vision device cannot work in a completely dark environment, so it is also called a low-light night vision device. It is generally equipped with an intensifier tube, or IIT for short. The new digital night vision device is not equipped with a photoelectric intensifier tube, but uses a charge-coupled device, referred to as CCD or complementary metal oxide semiconductor, referred to as CMOS, and micro-display imaging. It can work in a completely dark environment. This is the current technology Advanced night vision equipment.

What is the important difference between traditional night vision and digital night vision? Since the digital night vision device does not rely on traditional image intensifiers for imaging, the light is converted into electronic signals and then form an image output. This technology overcomes the shortcomings of traditional night vision devices that are easily damaged by strong light, even when used during the day. Safe and secure-this is its important advantage. In addition, compared with traditional night vision devices, the imaging of digital night vision devices is much clearer and more detailed.

Thermal imaging technology is one of the most complex technologies on the market. It does not rely on existing light imaging that is invisible to the human eye, but instead detects the heat emitted by the object itself. The higher the heat emitted by an object, the more long infrared waves it emits, and the easier it is to be detected.

How did the detected heat turn into an image? The thermal imager uses a thermal radiometer to detect heat. The thermal radiometer can measure the temperature difference between the hot object and its surrounding environment, and then use the points where the temperature difference exists to form an image.

The price of a thermal imager is much higher than that of an ordinary night vision device. Does it have any special advantages? Like digital night vision devices, thermal imagers can also be used in completely dark environments, unlike general night vision devices that rely on intensifiers to work in low light environments. In addition, it can overcome obstacles such as fog, smoke, dust, and plants, and pass through them for clear imaging-in hunting, this is definitely an incomparable excellent advantage.


Post time: Nov-26-2020