Ultraviolet lamps for non-destructive testing have greatly increased in popularity over the years. Ultraviolet light is one of the main factors responsible for causing ozone layer depletion, and it is suspected that ozone layer depletion may also play a role in climatic changes and global warming. Since the 1970’s the usage of ultraviolet light for various scientific and industrial purposes has grown tremendously. It is now commonplace in many laboratories, especially those associated with the fields of biology, chemistry, physics, astronomy, and computer science. If you have any interest in this field, it is important to understand how ultraviolet light tubes work.
The most popular type of ultraviolet light tubes is the ultraviolet light tube, or UVL. There are three types of UVL: the Visible Light Therapy orUVL, the UVA/UVB. The Visible Light Tube, orUVL, is the light source used in most medical treatments. It consists of a mercury lamp, a positive and negative chamber filled with different levels of UVA and UVB. Both chambers produce radiation in the visible spectrum. The UVA and the UVB are considering the “good” types of radiation to cause damage to DNA and cell structures, respectively.
In the realm of non-destructive testing, the UVL can be replaced by an inert gas, such as argon, xenon, or phosphorous. The reason that this is necessary is because fluorescent dyes tend to react with the phosphorous coating on an object. The fluorescent lamp used in the lab generally has two electrodes, one positive and one negative. When a small amount of light from an UVL strikes the phosphorous it causes a reaction, which causes the electrons in the phosphorous to jump to a new orbital around the atom, thus releasing energy in the form of a light photon.
The two main methods that are currently in use to measure the intensity of light emitted by any material are exposure to the light at various wavelengths, and measuring the response time of the material to the light. When you look at a piece of glass, for instance, the wavelength that it can emit is generally measured in meters. A meter is a device that measures the time it takes for a light to reach the target when incident light strikes it. You can use a meter to determine the thickness, width, or height of something. However, there are many other ways to measure thickness, width, height, or the time that it takes for light to pass through any material, and we will now mention two of them.
Both wavelengths and times can be measured using a standard optical meter, but since we’re dealing here with UVL, we’ll have to use special devices called spectrometers to do so. A spectrometer uses a combination of measurement methods to determine the polarity, or electrical charge, of a material. For materials that absorb ultraviolet light, the light spectrum will contain the same peaks as that of the fluorescent lamp.
Ultraviolet light is difficult to observe and measure. But the good news is that it does not have to be. If you have access to a laboratory that has access to a dedicated ultraviolet lamp for non-destructive testing, then you can easily use this type of light source to test a material. Plus, these lamps usually provide much better results than the fluorescent ones we previously talked about. As long as the device you use for this testing has been designed properly, you should be able to observe and test nearly any material with only a few precautions.