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Knowledge about Laser Safety

Knowledge about Laser Safety

Dec 04, 2020

Lasers are widely applied in various applications, but improper use may cause injuries. That why we should pay attention to laser safety., and take corresponding safety protection measures

 There are 2 systems of laser safety class. One is specified by the IEC 60825-1 standard, the other is issued in the United States through consensus standards (ANSI Z136.1) and federal and state regulations. These 2 systems are generally based on the same concept, just a slight difference in designations. Let take the US standard as an instance:

There are 2 systems of laser safety class. One is specified by the IEC 60825-1 standard, the other is issued in the United States through consensus standards (ANSI Z136.1) and federal and state regulations. These 2 systems are generally based on the same concept, just a slight difference in designations. Let take the US standard as an instance:

 

Class I:

The lowest laser energy level, low output power, no possibility of eye damage.

Class II:

Output power can be up to 1mW. The low-energy laser within the visible range can be directly viewed under carefully controlled exposure conditions. It should be labeled to warn people that don’t deliberately stare into the beam for an extended period.

Class IIa:

Continuous viewing for over 1,000s will do harm to human eyes. Some laser scanners are in this class.

Class IIIa:

Output power from 1mW to 5mW, will not burn the skin. The "caution" warning label, otherwise a "danger" warning label is required. Control the contact of eye within 2 minutes. Many laser pointers or laser sights are in this class.

Class IIIb:

Output power from 5mW to 500mW. When the output power is high, there’s the possibility to burn the skin and cause fire hazards. Lasers may cause permanent eye damage if the beam enters the eye directly. The proper goggles or protective glasses are required.

Class IV:

Output power over 500mW. Besides Class III laser protection measures, the following aspects should notice: ①Close all optical paths; ②When conditions permit, use remote operation and TV monitoring system, laser Separate from the working room; ③Set up a key-controlled main control interlock switch, equipped with beam cutoffs, filters, shields, and other devices; ④Use materials that can easily absorb infrared rays or refractory materials where infrared lasers may be irradiated ⑤Beam shielded when using UV laser, pay attention to ventilation of the working environment. Many industrial or military, scientific, military and medical lasers are in this class.

 

As for the Protective Suit, including the application of flameproof overalls and goggles. Work clothes should be reflective white. It is strictly forbidden to watch the laser beam with naked eyes, and prevent the laser from being reflected to the eyes. According to the protection mechanism, laser protective goggles can be classified into three types: reflective, absorptive and composite. Different types of protective goggles have different protective effects. Suitable protective goggles should be selected according to laser safety standards and specific requirements.

 

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