Lambu na Vapour ta Mercury

A cikin lambu na fara, dakatar da tsirrai an yi masa hanyar wadanda 60% daga abubuwan da aka bayar zai a gane 253.7 nm single line. Sai dai ake yi yadda electrons ke ci gaba ita ce mai karfi a kan energy da ake bayar daga colliding electron. Idan karamin lalace take nuna, yawanci ake yi multiple collisions. A nan ya bayyana diagram mai sauƙi da ke cikin lambu na mercury. Wannan lambu tana da tube na arc na quartz fiye da tube na borosilicate glass na gaba. Tube na quartz yana iya daidaita temperature na arc 1300K, amma tube na gaba tana iya daidaita baki 700K.

A nan biyu na tubes an yi gas na nitrogen don bayyana insulation. Wannan insulation tana da shugaban da suka maida suka yi oxidation saboda temperature na arc mai karfi. Tube na arc tana da mercury da gas na argon. Operational function ta sama da lambu na fara. Biyu na main electrodes da starting electrode ne a nan tube na arc. Duka main electrode tana da tungsten rod da ake winda double layer na coiled tungsten wire. Bisa ga electrodes suna doke a nan mixture na thorium, calcium da barium carbonates.

Sunan doke kuma an yi heating don a gane wannan compounds zuwa oxides. Saboda haka suka daidaita thermal da chemical stability don a yi electrons. Electrodes suna doke a nan tube na quartz da molybdenum foil leads.

Idan an yi main supply voltage a nan lambu na mercury, wannan voltage tana da shugaban da suka yi starting electrode da adjacent main electrode (bottom electrode) kuma across biyu na main electrodes (bottom and top electrodes). Saboda gabas da ke daga starting electrode da bottom main electrode tana da small, gradient na voltage tana da shugaban da suka yi high a nan gabas.

Saboda gradient na voltage mai karfi a nan stating electrode da adjacent main electrode (bottom), an yi local argon arc, amma current tana da shugaban da suka yi limited using starting resistor.
This initial arc heats up the mercury and vaporizes it and this mercury vapor helps to strike the main arc soon. But the resistance for the main arc current control resistor is somewhat less than the resistance of the resistor used in the initial arc current control purpose. For this reason initial arc stops and main arc continues to operate. It takes 5 to 7 minutes to make all of the mercury to be vaporized completely. The lamp gets its state of its operational stability. The mercury vapor arc gives visible spectra of green, yellow and violet. But there may be still some invisible ultraviolet radiation during discharging process of mercury vapour so phosphor coating may be provided on outer glass cover to improve efficiency of the mercury lamp.

There are five lamps with phosphor coating to provide improved color performance. As the wattage increases the initial lumen ratings for the phosphor coated lamps get available with 4200, 8600, 12100, 22500 and 63000 ratings. The average life of mercury lamp is 24000 hours i.e. 2 years 8 months.
Mercury Lamp data is given below.

Statement: Respect the original, good articles worth sharing, if there is infringement please contact delete.