An electronic device in which an image formed by invisible radiation (usually gamma rays, X-rays, ultraviolet, or infrared) is converted into a visible image. Commonly the invisible radiation is focused on to a photocathode, which emits electrons when it is exposed to the radiation. These electrons fall on a fluorescent anode screen, after acceleration and focusing by a system of electron lenses. The fluorescent screen produces a visible image. The device is used in fluoroscopes, infrared telescopes, ultraviolet microscopes, and other devices.
An electron tube that converts an image outside the visible part of the spectrum, such as an infrared image, into a visible image. The ‘nonvisible’ image is focused on a photosensitive cathode and produces electrons. These are attracted to a positively charged fluorescent anode screen, and focused on it by an electron-lens system (see diagram). A visible image is produced on the screen. Image converters have many applications and are used in X-ray intensifiers, infrared telescopes and cameras, electron telescopes, and microscopes.
Image converter
- knowledge
- knowledge acquisition
- knowledge base
- knowledge-based organizations
- knowledge-based system
- knowledge by acquaintance and description
- knowledge, causal theory of
- knowledge de re/de dicto
- knowledge discovery in databases
- knowledge economy
- knowledge elicitation
- knowledge engineering
- knowledge engineering toolkits
- knowledge flows
- knowledge in geography
- knowledge representation
- known plaintext attack
- known text attack
- Knox, Henry (1750–1806)
- Knox, John (1505–72)
- Knudsen diffusion
- Knudsen flow
- Knuth, Donald (1938– )
- Knuth, Donald E. (1938–)
- Knuth, Donald Ervin