Engineer Manager Name: Jacky
WhatsApp/ Wechat: 0086-187 9245 6795
Email: mh_elec@126.com or jacky@mh-elec.com
--Resolution
The ability of an image intensifier or night vision system to distinguish between objects close together. Image intensifier tube resolution is measured in line pairs per millimeter (lp/mm) while system resolution is measured in cycles per milliradian. For any particular night vision system, the tube resolution will remain constant while the system resolution can be affected by altering the objective or eyepiece optics and by adding magnification filters or relay lenses. Often the resolution in the same night vision device is very different when measured at the center of the image and at the periphery of the image. This is especially important for devices selected for photography or video where the resolution of the entire image is important.
--Signal-to-Noise Ratio (SNR)
SNR is a ratio of the magnitude of the signal to the magnitude of the noise. If the noise in the scene (see “scintillation” definition) is as bright and as large as the intensified image, you cannot see the image. SNR changes with light level because the noise remains constant but the signal increases (higher light levels). The higher the SNR ratio, the darker the scene can be and the device still performs. The effect of SNR ratio in I2 devices is similar to that of a television far away from the TV station. At long distances from the station, the TV picture becomes noisy, and the ”snow“ blocks the picture.
--Figure of Merit (FOM)
Image intensification tube specification used to qualify exportability. Calculated on resolution (line pairs per millimeter) x signal-to-noise.
Engineer Manager Name: Jacky
WhatsApp/ Wechat: 0086-187 9245 6795
Email: mh_elec@126.com or jacky@mh-elec.com
