Halogen Light Source: Application sin Spectrophotometry


Halogen light sources have come a long way from a traditional light bulb to a high precision lamp. Halogen bulbs derive their name from the halogen gas filled inside the lamp casing which houses the tungsten filament.

Here are the different types of halogen light sources used in spectrophotometry:

Deuterium lamp

It is also known as D2 lamp. The wavelength range varies from 190nm – 370nm. A normal glass exterior is not suitable due to its high temperature condition. Hence quartz or some other material is used. A deuterium lamp can live up to 1000 hours. A deuterium lamp is made with halogen lamps in an UV/VIS spectrophotometer. This will aid in canvassing the whole visible and UV light wavelength.

Deuterium lamp is a good source of ultraviolet light for analytical instruments, liquid chromatography detectors, pollution analyzers, medical analyzers, densitometers, and colorimeters. They are well suited for secondary calibration standards in the UV region.

Halogen lamp

It is the second halogen light source used. We also know it by the name of quartz or tungsten lamp. It is active in the wavelength range of 320nm to 1100nm of the visible region. By any chance, if the instrument consists of just the halogen lamp, then it implies that the instrument can calculate just the visible light. The lamp life is 2000 hours or more.

Xenon Lamp

The xenon lamp dispenses high energy light source. It has the capability of reaching an immovable state really fast. The halogen light source type covers the whole of visible wavelength ranging from 190nm to 1100nm. Its overall life term is longer than deuterium lamp or halogen lamp. It lights up in the 80 htz frequency. Nevertheless, xenon lamps cost higher than the other two. 

LED Lamp

It produces light of a single wavelength. This is perhaps the reason it doesn’t require a monochromator. Their life span is really long. The halogen light source shows extremely little variation in bandwidth. It is immovable too. LED light source is not very expensive.

Hybrid

It is a combination of a tungsten halogen lamp and deuterium lamp. It can cover a wide range of wavelength from UV to NIR (185-2500).

Summing up
The above mentioned halogen light sources are broadband light sources. They are required for absorption, transmittance and spectroscopic measurements. For their superb abilities, they are here to stay.





Location: Australia

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