Barriers & Protective Curtains
There are special barriers specifically designed to withstand either direct or diffusely scattered beams, which can act as a control for an area where a laser is in operation. The barrier will have a designated barrier threshold limit (BTL). The BTL is defined as the specified exposure time that it will take for the beam to penetrate the barrier (typically 60 seconds). The barrier is located at a distance from the laser source so that the BTL is not exceeded in the worst-case exposure scenario.
Currently available laser barriers exhibit BTL ranging from 10 to 350 W/cm2 for different laser wavelengths and power levels. It is the responsibility of management to determine the correct barrier type and installation distance for this type of control.
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