photocathode sentence in Hindi
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- Photons from a dimly lit source enter the objective lens ( on the left ) and strike the photocathode ( gray plate ).
- The photocathode ( which is negatively biased ) releases electrons which are accelerated to the higher-voltage microchannel plate ( red ).
- First, an automatic gated power supply system regulates the photocathode voltage, allowing the NVD to instantaneously adapt to changing light conditions.
- Ultraviolet can be detected by suitable photodiodes and photocathodes, which can be tailored to be sensitive to different parts of the UV spectrum.
- The process of reversing the control voltage at the photocathode is called " gating " and therefore ICCDs are also called gateable CCD cameras.
- In the example, the photocathode is held at a negative high voltage of order 1000V, while the anode is very close to ground potential.
- These are often called " photocathodes " and are used in phototubes used in scientific instruments and image intensifier tubes used in night vision goggles.
- Third generation night vision systems maintain the MCP from Gen II, but now use a photocathode made with gallium arsenide, which further improves image resolution.
- The effectiveness of a photocathode is commonly expressed as quantum efficiency, that being the ratio of emitted electrons vs . impinging quanta ( of light ).
- It uses magnetic and electric fields operating in a vacuum to focus the electrons released from a photocathode by incoming light onto a collection of silicon diodes.
- The more recent development of solid state optical devices such as photodiodes has reduced the use of photocathodes to cases where they still remain superior to semiconductor devices.
- The pump laser will inject to the sample to induce the transitions, after finite time, another UV laser will hit the photocathode to produce electron pulses.
- It is suggested that caesium suboxides play a role in the Ag-O-Cs ( S1 ) and multialkali Na-K-Sb-Cs photocathodes.
- Using an S-20 photocathode, their image intensifiers produce a light amplification of around 1, 000? but are quite bulky and require moonlight to function properly.
- Factors that affect the MTF include transition through any fiber plate or glass, at the screen and the photocathode and also through the tube and the microchannel plate itself.
- Optical feedback has also been experimented with as an electron source, since a photocathode-phosphor cell will'latch'when triggered, providing a steady stream of electrons.
- In the late 1990s, innovations in photocathode technology significantly increased the signal-to-noise ratio, with newly developed tubes starting to surpass the performance of Gen 3 tubes.
- The resultant output signal at the anode is in the form of a measurable pulse for each group of photons that arrived at the photocathode, and is passed to the processing electronics.
- In 1930 the introduction of the Ag-O-Cs photomultiplier provided the first practical solution to the detection of IR, combining it with a layer of galena as the photocathode.
- The photoelectrons are accelerated towards the MCP by an electrical control voltage, applied between photocathode and MCP . The electrons are multiplied inside of the MCP and thereafter accelerated towards the phosphor screen.
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