Appendix B Reference Manual
Ranger E/D
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Appendix
B Laser Safety
Whenever a laser module is used in combination with a Ranger, it is considered being a
part of a laser system
, which has to incorporate additional safety features, depending on
the applicable laser class.
Laser Safety Classification
The International Electrotechnical Commission (IEC) and the United States Center for
Devices & Radiological Health (CDRH) enforce strict safety requirements for lasers and
laser products.
Recommended reading: Laser Institute of America Laser Safety Guide.
It is important to understand the safety issues regarding laser systems. This is so that the
complete installation can be performed in accordance with the laser safety regulations.
The relevant standards, IEC 60825–1 and 21 CFR 1040.10/11 (CDRH), classify lasers
into several categories, and the regulations regarding the different classes applicable to
the used laser are given here.
Classification
The classification of a laser product
is based on the laser power measured according to
the methods defined by the IEC and CDRH standards. The classification refers to the
visible wavelength range between 400 nm and 700 nm.
This corresponds to the maximum light power measured through a 7 mm aperture, meas-
ured in distances given in the standards.
The limitations for the classification of the laser classes is then
Class II / 2M 1 mW for emission duration ≤ 0.25 sec
*
Class IIIb / 3B 500 mW for emission duration ≥ 0.06 sec
*
natural aversion behavior for exposure to bright light
Class II / 2M – "Caution"
Considered eye-safe with caution, but may
present a greater hazard if viewed using
collecting optics. Focusing of this light into
the eye could cause eye damage.
Class II / 2M laser products must bear
warning and certification labels.
Class IIIb / 3B – "Danger"
Considered dangerous to your retina if
exposed. This includes looking directly into
a reflection from a specular (mirror-like)
surface. Normally, class IIIb / 3B lasers
will not produce a hazardous diffuse
reflection.
Class IIIb / 3B laser products must bear
warning and certification labels.
In addition to the above requirements, the certification for class IIIb / 3B laser systems
is
only given if additional safety requirements are fulfilled and a laser safety officer is named.
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