What is the NOHD (or N.O.H.D.)?NOHD is the abbreviation of "Nominal Ocular Hazard Distance". It specifies the distance from the laser source source at which the intensity of a single laser beam becomes safe by not exceeding the MPE (Maximum Permissible Exposure) any more. The laser beam is considered to be dangerous if viewed from a closer distance than that.
THIS TOOL IS NOT SUITABLE FOR CALCULATING THE SAFETY OF A LASER SHOW DISPLAY! IN SHOW LASER INDUSTRY IT IS ONLY RELEVANT FOR DETERMINING THE SAFETY DISTANCE FOR OUTDOOR LASER DISPLAYS WITH SINGLE BEAMS, WHICH IS A VERY RARE OCCASION, AS THE BEAMS ARE USUALLY DEFLECTED AND MODULATED IN OUR INDUSTRY!
Laser shows with deflected and modulated laser sources are considered safe at very much closer distances, usually only several meters!
Like the MPE, the NOHD depends on several parameters :
- The output power of the laser
- The beam specifications diameter at aperture and divergence
This NOHD online calculator is provided as is. Laserworld cannot be held liable for the results nor do we guarantee the correctness and accuracy of the results. The NODH calculator is only applicable for laser sources in cw operation mode and only valid for the wavelength span from 400 to 700nm - which are common parameters for show laser systems.
Decimal separator is: . (Point), not Comma
|The NOHD distance is:|
What do I need the NOHD calculation for?
The calculator above can help you in determining this Nominal Ocular Hazard Distance with ease. Be aware that the divergence heavily influences on the actual power over distance.