Construction and working of sodium vapour lamp pdf

A fluorescent lamp is a low weight mercury vapour lamp that uses fluorescence to deliver visible light. The construction and applications of sodium vapour lamps. A lowpressure sodium vapour lps lamp contains an inner discharge tube made of borosilicate glass that is fitted with metal electrodes and filled with neon and argon gas and a little. The heat from this warms sodium metal in the light to the point of vaporizing, which. The striking feature of sodiumvapor lamps is their radiation dominated by the. The sodium lamp how it works and history edison tech center. In normal operation, standby lamps alternate operation between the arc tubes. This blog showcases in detail the working of highpressure sodium vapour lamp. Sodium vapor lamps are some of the most efficient lamps in the world. Low pressure sodium lamps require a number of parts each working in tandem for the lamp to produce light.

What is the working principle of mercury vapour lamp answers. The light in sodium vapour lamp is from an atomic emission process whereas in mercury vapour lamp it is, finally, from fluorescence emission. High pressure sodium lamps or hps lamps electrical4u. Matching the proper lamp type to the intended work task or aesthetic application, consistent with. Philips has not released the names of the individuals who did the monumental work of developing a reliable sodium lamp ready for widespread use. Principle of working of a sodium vapour lamp answers.

Principally the sodium vapour lamp consists of the bulb containing a small amount of metallic sodium, neon gas, and. Hps lamp is the better version of its counterpart lps lamp. An electric current in the gas energizes mercury vapor which delivers ultraviolet radiation through discharge process and the ultraviolet radiation causes the phosphor coating of the lamp inner wall to radiate visible light. Mercury vapour, at high pressure, is filled inside a glass. In elenbaas 1972 it reported about electrode construction, and additionally. This article will provide details on the working, construction, and applications of the mercury vapour lamp. A lowpressure sodium vapor lamp or lpsv lamp is termed as a miscellaneous discharge lamp as it possesses some characteristics of. High pressure sodium hps lamps, a member of the high intensity discharge hid. The presence of neon gas serves to start the discharge envelope is usually bent into u shape. A high pressure sodium lamp consists of a translucent ceramic arc tube. Fluorescent lamp and working principle of fluorescent lamp.

A sodiumvapor lamp is a gasdischarge lamp that uses sodium in an excited state to produce. Sodium vapour lamp construction and working deepakkumar. A sodiumvapor lamp is a gasdischarge lamp that uses sodium in an excited state to produce light at a characteristic wavelength near 589 nm two varieties of such lamps exist. Working principle of sodium vapour lamp polytechnic hub. In a low pressure sodium vapour lamp, argon or neon gas is first heated up to emit a slight red or purple glow. They are commonly used in public parking lots, roadways, and other security areas. Construction, working and applications of following lamps. This construction led the general electric company to use the tradename. Coble working at the general electric research lab near. They have an efficiency of up to 190 lumens per watt compared to an incandescent street lamp which has between 15 and 19. Lowpressure sodium lamps are highly efficient electrical light sources, but their yellow light restricts applications to outdoor lighting, such as street lamps, where they are widely used. Sodium lamps were first produced commercially by philips in holland in 1932. The first lamps had a removable outer jacket with a vacuum between glass to insulate the bulb to keep it hot enough to keep the sodium in vapor form. High pressure sodium lamps lighting associates, inc.