1. Main features and performance levels of image intensifiers

In addition to the brightness gain, equivalent background illuminance, responsivity and other characteristics of the low-light night vision device, the magnification, resolution, limit resolution characteristics of the image intensifier and the effective diameter of the photocathode also directly affect the overall performance of the low-light night vision device. important parameters.

 

 

2. Optical properties of low-light night vision devices

In terms of practical performance, the low-light night vision device can be regarded as a telescope with an image intensifier, so it has the main optical properties corresponding to ordinary telescopes.

 

 

3. Other

In order to meet the needs of working under extremely low illumination (10^-5~10^-4lx conditions), the so-called "hybrid" type low-light instrument scheme has appeared. This "hybrid" is mainly manifested in the image intensifier. The first-stage tube or the third-generation tube is used as the first stage, and the first-stage tube is used as the second-stage coupled image intensifier. The best compromise between gains, and the resolution ratio is % lower than that of the second-generation close-fitting tube. This allows the two to give full play to their advantages and avoid weaknesses. Based on this kind of idea, the so-called first and a half, second and a half twilight nights appeared. Vision plan.