How is the laser's safety rating divided?

How is the laser's safety rating divided?

Hello everyone, I am very glad that you have chosen Chengdu Jingruite!

At present, Chengdu Jingruite's customers, we choose more than our high-precision distance measuring sensor, it is the principle of phase, can achieve millimeter precision, the second type of laser.

So, what is the safety level of the laser? In general, a powerful laser beam can cause damage to the human body, such as the eyes or skin. Therefore, the International Electrotechical Commission (IEC) and the Food and Drug Administration (FDA) categorize the safety of laser equipment according to the magnitude of its laser output.

There is a difference between the IEC standard and the FDA standard. The IEC has five main levels: Class1, Class2, Class3A, Class3B, and Class4. The FDA is more detailed, with six main grades: ClassI, ClassIIa, Class II, Class IIIa, Class IIIb and Class IV.

The laser safety level is as follows:

Class I: Low output laser (power less than 0.4mW), usually called a laser.

(1) Under no circumstances should the eyes and skin exceed the MPE value, and even after focusing through the optical system, the MPE value will not be exceeded. The design can be secured without special management.

(2) Usually the beam is completely enclosed, such as in a CD player, CD-ROM device or DVD player. There are also other applications such as laser pointers, geological exploration equipment and laboratory analytical instruments.

Class II: Low output visible laser (power 0.4mW-1mW), also known as Class 2 laser.

(1) The reaction time for a person to close an eye is 0.25 seconds, and the amount of exposure calculated using this period of time may not exceed the MPE value.

(2) Generally, lasers below 1mW will cause dizziness and cannot be considered. It is safe to use closed eyes. It cannot be said to be completely safe. Do not observe directly in the beam, and do not directly use the Class II laser to illuminate other people's eyes. Equipment to observe Class II laser.

(3) Typical applications such as classroom demonstrations, laser pointers, aiming equipment and handheld laser rangefinders.

Class III: Medium output laser. If the beam is directly injected into the eye, it will cause damage. For some safety reasons, it can be further divided into IIIA and IIIB.

Class IIIA: continuous laser for visible light, output laser beam of 1-5mW, the energy density of the beam should not exceed 25W/m-m, avoiding the observation of IIIA laser with Yuanwang equipment, which may increase the danger. Typical applications for Class IIIA have many similarities to Class II, such as laser pointers, laser scanners, and more. - Power usually reaches 5mW, and watching this beam for a few seconds can cause immediate damage to the retina.

Class III B: Continuous laser of 5-500 mW, which is dangerous to observe directly in the beam. However, the small irradiation distance is 13cm, and the irradiation time of less than ten seconds is safe. Typical applications for IIIB lasers include spectrometry and entertainment lighting performances. - Immediate damage to the eyes when exposed.

ClassIV: High output continuous laser (greater than 500mW), higher than the third level, there is a danger of fire, and diffuse reflection is also dangerous.

(1) The laser will burn the skin, even if the scattered laser light (200W or more) will cause damage to the eyes and skin. Using the thermal energy of the laser, new cooking tools can be made.

(2) Typical applications such as surgery, research, cutting, welding and micromachining.