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An image intensifier or image intensifier tube is a vacuum tube device for increasing the intensity of available light in an optical system to allow use under low-light conditions, such as at night, to facilitate visual imaging of low-light processes, such as fluorescence of materials in X-rays or gamma rays (X-ray image intensifier), or for conversion of non-visible light sources, such as ...
These were active devices, using an infrared light source to illuminate targets. Their image-intensifier tubes used an anode and an S-1 photocathode, made primarily of silver, cesium, and oxygen, and electrostatic inversion with electron acceleration produced gain. [11] An experimental Soviet device called the PAU-2 was field-tested in 1942.
However the AN/PVS-4 does have a reputation for holding zero and being able to withstand high recoil, making it popular amongst enthusiasts who are able to get a reasonable good condition item. The optics are considered exceptional, even by contemporary standards and the biggest drawback compared to modern scopes is the weight.
The combination of high gain, low noise, high frequency response or, equivalently, ultra-fast response, and large area of collection has maintained photomultipliers an essential place in low light level spectroscopy, confocal microscopy, Raman spectroscopy, fluorescence spectroscopy, nuclear and particle physics, astronomy, medical diagnostics ...
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The term boresight came from high-gain antennas such as parabolic dishes, which produce narrow, pencil-shaped beams which are difficult to aim accurately at a distant receiving antenna. These often are equipped with optical boresights to assist in aiming.
Luigi Mangione, 26, was charged with murder late Monday in the Dec. 4 shooting of UnitedHealthcare CEO Brian Thompson in New York City after police in Altoona, Pa., were called to a McDonald’s ...
Patrick Mahomes and the Kansas City Chiefs are on the cusp of clinching the No. 1 seed in the AFC. They defeated the Houston Texans 27-19 during a Saturday matchup of two division winners.