TV and Radar

Monochrome Picture Tube

Definition: A monochrome picture tube is a specialized CRT that produces a black and white image on the screen of the tube by the action of an electron beam. The screen of the tube consists of a layer of phosphor that produces light when a high-velocity beam strikes it. A picture tube basically acts as …

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Video Switcher (Vision Mixer)

Definition: A video switcher is a crossbar switch that allows selection of one or more desired sources or inputs from multiple sources so as to generate a complete program. It is also known as a vision mixer. It is basically a switch matrix that selects either one or more input out of various inputs to …

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Plumbicon

Plumbicon camera tube is a photoconductive type of camera tube as photoconduction is the basis of its operation. This camera tube was invented in the year 1963 by Philips. One of the major reasons behind the invention of Plumbicon is the drawback of image lag associated with Vidicon tubes. To eliminate this drawback, the target …

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Image Orthicon

Image Orthicon is a photoemissive type of camera tube. Photoemission is the basis of its working. This camera tube was invented in the year 1945 by Radio Corporation of America. Photocathode acts as a primary element in the operation of image orthicon. This is so because photocathode allows the emission of electrons from its surface …

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Vidicon Camera Tube

Definition: A Vidicon is a type of camera tube whose basis of working is photoconductivity. Basically it changes optical energy into electrical energy by the variation in resistance of the material with respect to the illumination. These camera tubes were invented in the 50s. The tube length is around 12 to 20 cm with a …

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TV Camera Tubes

TV camera tubes act as the eye of the television system. It is an electronic device that contains a light-sensitive plate and a scanning system, that can produce an equivalent electrical signal from an optical signal. The light-sensitive plate is also known as the target plate. We know that a picture is usually composed of …

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Doppler Effect in Radar

Doppler effect in the radar system is a phenomenon of change in frequency of the transmitted and received signal when the object is not stationary. More specifically we can say, it defines the variation in the frequency of the signal when the object is moving in space. This phenomenon was defined in 1842 by an …

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Radar Range Equation

In the previous lecture, we have discussed the basics of radar and how radar is used for detection and location of an object in space. But the question arises is there any limit which specifies the range up to which this detection is possible? So the answer to this question is yes, there exist some …

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Radar System

Definition: RADAR is an abbreviation for RAdio Detection And Ranging. A system used for detecting and locating the presence of objects like ships, vehicles, aircraft etc. by radiating electromagnetic signal in space is known as the Radar system. Basically, radar is used to collect the information related to the object or target like its range and …

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