Construction and working of sodium vapour lamp pdf

The presence of neon gas serves to start the discharge envelope is usually bent into u shape. Highpressure sodium lamps also known as hps lamps or hps lights are a type of sodium lamp that is widely used in industrial lighting and many public outdoor areas. The sodium lamp how it works and history edison tech center. Principle of working of a sodium vapour lamp answers. This article was most recently revised and updated by robert curley, senior editor. Better efficiency, life and size are few of the advantages of hps lamp over lps lamp. The most efficient lamp operation is achieved when the ambient temperature is between 20. A fluorescent lamp is a low weight mercury vapour lamp that uses fluorescence to deliver visible light. Working principle of sodium vapour lamp polytechnic hub.

The mechanism of light emission in a sodium vapour. The construction and applications of sodium vapour lamps. 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. Sodium vapor lamps are some of the most efficient lamps in the world. The light in sodium vapour lamp is from an atomic emission process whereas in mercury vapour lamp it is, finally, from fluorescence emission. What is the working principle of mercury vapour lamp answers.

A sodiumvapor lamp is a gasdischarge lamp that uses sodium in an excited state to produce. High pressure sodium lamps or hps lamps electrical4u. This article will provide details on the working, construction, and applications of the mercury vapour lamp. Principally the sodium vapour lamp consists of the bulb containing a small amount of metallic sodium, neon gas, and two sets of electrodes connected in a pin type base. 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. High pressure sodium hps lamps, a member of the high intensity discharge hid.

The striking feature of sodiumvapor lamps is their radiation dominated by the. In a low pressure sodium vapour lamp, argon or neon gas is first heated up to emit a slight red or purple glow. In normal operation, standby lamps alternate operation between the arc tubes. Sodium lamps were first produced commercially by philips in holland in 1932. 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. This blog showcases in detail the working of highpressure sodium vapour lamp. They have an efficiency of up to 190 lumens per watt compared to an incandescent street lamp which has between 15 and 19. Low pressure sodium lamps require a number of parts each working in tandem for the lamp to produce light. Sodium vapour lamp construction and working deepakkumar.

A lowpressure sodium vapor lamp or lpsv lamp is termed as a miscellaneous discharge lamp as it possesses some characteristics of. In elenbaas 1972 it reported about electrode construction, and additionally. They are commonly used in public parking lots, roadways, and other security areas. Coble working at the general electric research lab near. Fluorescent lamp and working principle of fluorescent lamp. The heat from this warms sodium metal in the light to the point of vaporizing, which. A high pressure sodium lamp consists of a translucent ceramic arc tube. This construction led the general electric company to use the tradename. Mercury vapour, at high pressure, is filled inside a glass. Principally the sodium vapour lamp consists of the bulb containing a small amount of metallic sodium, neon gas, and. Philips has not released the names of the individuals who did the monumental work of developing a reliable sodium lamp ready for widespread use.

Construction, working and applications of following lamps. Sodiumvapour lamp, electric discharge lamp using ionized sodium, used for street lighting and other illumination. Matching the proper lamp type to the intended work task or aesthetic application, consistent with. The end caps of the arc tube would get as hot as 800 degrees c in operation, then cool to.