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 …
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 …
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 …
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 …
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 …
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 …
A travelling wave tube is a high power amplifier used for the amplification of microwave signals up to a wide range. It is a special type of vacuum tube that offers an operating frequency ranging between 300 MHz to 50 GHz. Travelling wave tubes are non-resonant structures that offer continuous interaction of applied RF field …
Definition: A magnetron is a device that generates high power electromagnetic wave. It is basically considered as a self-excited microwave oscillator. And is also known as a crossed-field device. The reason behind calling it so is that the electric and magnetic field produced inside the tube are mutually perpendicular to each other thus the two …
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 …
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 …