Low Pressure Mercury Vapour Lamp

Lamp output in the uv range depends on the amount of mercury and vapor pressure of mercury in the lamp.

Low pressure mercury vapour lamp. Fluorescent and germicidal lamps are included in this. In low pressure mercury vapor lamps only the lines at 184 nm and 254 nm are present. Again transition of the electrons requires least amount of input energy from a colliding electron. The first mercury vapor lamps were in a lower pressure tube.

Viewed 18 times 0 begingroup closed. Rather than a cold spot the lamp s amalgam spot on pellet regulates mercury vapor pressure during operation and yields up to three times the uvc output of a standard low pressure mercury lamp of the same length. Looking for low pressure mercury lamp. Low pressure mercury vapor lamps do they always produce both 184 5nm and 253 7nm.

As pressure increases the chance of multiple collisions gets increased. Active 5 days ago. Mercury vapor conducts electricity completing the circuit. Explanation of low pressure mercury lamp.

Amalgam lamps use a mercury amalgam mix to control mercury vapor pressure. Find out information about low pressure mercury lamp. In medium pressure mercury vapor lamps the lines from 200 600 nm are present. These types of lamps are available in ozone producing and ozone free quartz with a variety of phosphors.

Low pressure mercury vapor lamps are a highly efficient source of uv light particularly short wavelength uv light 254nm and 185nm. Low pressure lp amalgam low pressure lp and medium pressure mp lamps are all mercury based lamps. This lamp has a highly stable output predominantly at the 253 7 nm mercury line. The blue green tint of mercury vapor lamps is caused by the strong violet and green lines.

Fused silica is used in the manufacturing to keep the 184 nm light from being absorbed. A mercury vapor lamp whose partial pressure during operation does not exceed 0 001 atmosphere. One would tip the lamp and electrical contacts on each side of the lamp would send electricity through a liquid mercury which started the lamp. In case of fluorescent lamp the mercury vapour pressure is maintained at lower level such that 60 of the total input energy gets converted into 253 7 nm single line.

Low pressure mercury vapour lamp hg 2 lamp heraeus has developed a compact low pressure low voltage mercury vapour lamp type hg2 principally for use in scientific instrumentation. This question is off topic. Closed ask question asked 5 days ago.