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March-April 2014 : The eye protection during penetrant and magnetic particles testing

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Written by Laurence
Wednesday, 05 March 2014 08:14

In the UV-A sources used in penetrant and magnetic particle testing, light-emitting diodes (LEDs) are increasingly replacing mercury vapour and μ-xenon discharge bulbs.

The inspectors shall wear UV-blocking goggles for two main reasons:

-    To avoid the blue haze phenomenon,

-    To protect the eyes.

This blue haze impedes the inspectors’ vision. Organic molecules in the vitreous humour of the eye fluoresce when UV-A radiation enters the eye.

Unfortunately, inspectors do not always wear them when submitted to UV-A radiation; the indications of discontinuities seem to have a lower contrast. The operators are not aware of the risks to their eyes: for example, UV-A radiation speeds up the onset and development of cataract, the clouding of the lens, which quickly leads to a blurred vision, and to situations of glare, including the headlamps of approaching facing vehicles. Thus, a dangerous situation!
Always wear the safety equipment put at disposal to operators, and pay a yearly visit to the ophthalmologist.

Now, the actinic blue light, centered on the 440 nm wavelength, is used to perform, for example, intermediate inspections without the need to be in a UV-A inspection booth. Then, the inspector shall wear suitable eye protection goggles, as the actinic blue light may quickly cause injuries to the retina.
Today, the LEDs sources are also used for inspection under white light. Some of these LEDs emit a very high luminance; the inspector shall be careful not to be dazzled. Some of them may also emit a high proportion of blue light, which may be harmful to the inspector’s eyes on long-term. Care shall therefore be taken.

The renowned suppliers of PT and MT materials and equipment are likely in the best position to provide you with:

-    The most suitable, most reliable sources, both technically and in terms of health and safety,

-    The safety instructions to be followed.

Feel free to ask questions. We will be happy to answer.

Last Updated ( Wednesday, 05 March 2014 14:58 )