Whether in position determination, distance measurement or object recognition – lasers enable the highest precision, even over long distances. But despite all the performance, an important question arises: How safe is the handling of laser light actually?
In order to answer this question unambiguously, lasers are divided into so-called laser classes. This classification provides information about how dangerous the laser beam can be for humans – especially for the eye.
Laser radiation is not ordinary light. It is monochromatic, highly bundled and coherent – that is, it consists of light of a single wavelength that strikes with almost no scattering. As a result, laser beams can reach high energy densities in very small areas.
Depending on the power, wavelength and focus, a laser can therefore be harmless or potentially harmful .
To ensure that users can handle this technology safely, the international standard EN 60825-1 regulates how laser sources are evaluated and classified.
Each laser class describes a certain degree of hazard and provides information on necessary protective measures.
Class 1 lasers are considered absolutely harmless to the human eye.
Even when looking directly into the beam, there is no danger, as the power emitted is so low that it cannot cause any damage.
➡️ No protective measures required.
Class 2 lasers emit visible light in the range of 400–700 nm.
They have a higher performance than class 1, but are also safe for short-term irradiation, as the natural eyelid closing reflex protects the eye within about 0.25 seconds.
Important: There must be no intentional prolonged observations of the beam. Warnings are mandatory.
➡️ Short-term view safely – avoid prolonged viewing.
Class 2M lasers are basically just as safe as Class 2, as long as no optical instruments (e.g. magnifying glass, binoculars, camera) are used.
Such aids can bundle the radiation and make it dangerous.
➡️ Safe in direct view, but not by optical magnification.
Lasers of this class can already cause eye injuries when viewed directly.
They lie on the border between harmless and dangerous (R = “reduced requirements”).
Handling requires safety measures, such as signs, protective covers, or staff training.
➡️ Avoid looking directly into the beam!
Class 3B lasers are much more powerful and can cause eye injuries even through short-term direct irradiation .
The reflected radiation can also be dangerous. Extensive safety measures (e.g. laser safety goggles, closed housings, shielding) are prescribed here.
➡️ To be operated only by trained specialists.
wenglor laser distance sensors only use class 1 and class 2 lasers.
This makes them completely safe for the human eye and can be operated without additional protective measures.
The classification of lasers makes it possible to objectively assess their hazard and to take appropriate protective measures .
For industrial sensor applications:
wenglor sensors combine precision with safety – thanks to state-of-the-art laser technology in harmless laser classes. In this way, users benefit from exact measurement results without compromising on personal protection.
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