Abit TX5 User's Guide download pdf (Page 16)

2 Safety Precautions and Maintenance

Laser safety

The TX5 3D laser scanner produces an invisible laser beam with a wavelength of 905nm. The average

laser power maximum is 20mW and the beam divergence is typically 0.19 mrad (0.011°).

In accordance to the standard IEC 60825-1:2007, Ed 2.0, the TX5 3D laser scanner is classified as a

Class 3R laser system. According to this standard, direct intrabeam viewing may be hazardous for

the eyes when working within an area around the Class 3R laser system where the defined exposure

limits are exceeded.

However, exceeding the exposure limits does not necessarily mean that an actual risk for injury

exists. An analysis comparing the exposure levels of the eye that can be produced by the TX5

3Dlaser scanner with injury thresholds for the retina in order to assess the risk for ocular injury

when exposure occurs, comes to the conclusion that "exposure of the eye under normal

conditions, as well as for reasonably foreseeable worst-case conditions, should not induce

ocular injury." For more information, refer to the expert opinion included at the end of this guide.

From a biophysical point of view, the TX5 3D laser scanner can thus be considered as eye safe and it

would not be necessary to wear eye protection.

However, depending on national regulation or work place safety legislation, it might be necessary to

wear eye protection and to observe other safety measures when the defined exposure limits are

exceeded and when exposure can occur. To enable the user to identify the laser hazard area

(nominal ocular hazard area – NOHA) around the scanner within which the defined exposure limits

are exceeded, the TX5 Controller software shows the actual valid eye safety distance (nominal ocular

hazard distance – NOHD). We differentiate between the axial and the radial NOHD. The resulting

NOHA surrounding the scanner can thus be described as a cylinder along the scanner’s Z axis of

rotation, where the radial NOHD is equivalent to the cylinder’s radius and the axial NOHD is

equivalent to its center line coming from the center of the scanner mirror.

Both, the axial and the radial NOHD are dependent on the requested scanning resolution and

quality (see Setting the scan parameters, page 46). The table below contains the axial and radial

NOHD (in meters), repetition rate and pulse duration for all resolution and quality combinations

that are available.

Trimble TX5 3D Laser Scanner User Guide 16

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Abit TX5 User's Guide Page 16