USER’S SAFETY PROTECTION MEASURES ACCORDING TO IEC60825-
1:1993+A1:1997+A2:2001 “LASER PRODUCT RADIATION SAFETY STANDARD”
I.
SAFETY GUIDE
I .
4 - 1 4
Page
12.2
Hazard evaluation for Class 3B and Class4 lasers used outdoors
The hazard potential for Class 3B and Class 4 lasers may extend over a considerable distance. The range from
the laser at which the irradiance or radiant exposure falls below the appropriate MPE is termed the nominal
ocular hazard distance (NOHD). The area within which the beam irradiance or radiant exposure exceeds the
appropriate MPE is called the nominal ocular hazard area (NOHA). This area is bounded by the limits of
traverse, elevation and pointing accuracy of the laser system and extends either to the limit of the NOHD or to
the position of any target or backstop. The exact NOHA will also depend on the nature of any material within
the beam path, e.g., specular reflectors.
The NOHD is dependent on the output characteristics of the laser, the appropriate MPE, the type of optical
system used, and the effect of the atmosphere on beam propagation. Formulae and examples for calculating the
NOHD are given in annex A.
12.3
Personal protection
The need to use personal protection against the hazardous effects of laser operation should be kept to a
minimum by administrative controls, engineering design and by beam enclosure.
When personnel may be exposed to potentially hazardous laser radiation (Class 3B and Class 4) adequate
personal protection should be provided.
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