Brief Introduction to Night Vision Devices and Optoelectronic Technology
Night vision devices, also known as night vision goggles, night vision telescopes, and infrared telescopes, are instruments used for observing at night in complete darkness or with low light. They have been applied for a long time. It is widely used in criminal investigation, * * prevention, forest fire prevention, power and communication patrol, construction sites, breeding farms, farm care, and even tourism and other fields. Night vision devices have been developed for half a century and can be roughly divided into several types:
1. Low light night vision technology, also known as image enhancement technology, is a photoelectric imaging technology that enhances the target image under weak light illumination through night vision goggles with image enhancement tubes for observation. Low light night vision devices are currently the most widely produced and versatile night vision equipment in foreign countries, which can be divided into two types: direct observation and indirect observation.
Infrared night vision technology is divided into two types: active and passive. Active infrared night vision technology is a night vision technology that observes by actively illuminating and utilizing the infrared light reflected by the target's infrared source. The corresponding equipment is an active infrared night vision device. Although active infrared night vision technology has the characteristics of clear imaging and simple production, it also has a fatal weakness: on the battlefield, the infrared light of the lamp will be detected by the enemy's infrared detection device. This weakness undoubtedly declares the fate of active infrared night vision technology being eliminated. Passive infrared night vision technology is an infrared technology that uses the infrared radiation emitted by the target itself to achieve observation. Simply put, it images based on different temperatures with low resolution, but it has its special purpose.
3. Some night vision devices have improved the semiconductor material of the photocathode, making it sensitive to both low light and infrared. The infrared night vision device and the low light night vision device are unified into one instrument, which functions as a low light night vision device on sunny nights and emits infrared light as an active infrared night vision device on rainy and foggy nights, with a longer range of action than a simple passive low light night vision device.
