Faro FOCUS3D X 130 User Manual page 154

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FARO Laser Scanner Focus X 130 Manual
January 2014
Test House for Laser LED and Lamp Safety
Expert Opinion Nr. LE-G-033/13
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This document is an abstract of the Expert Opinion LE-G-033/13 dated Sept. 13 2013.
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In LE-G-033/13, the laser safety class of a the laser product FARO Laser Scanner Focus X is
determined according to IEC 60825-1 Edition 2.0. The classification is based on information
provided by the manufacturer. It is noted that on the European level, the standard issued as
EN 60825-1 Edition 2.0 is identical to IEC 60825-1 Edition 2.0.
Reference:
International Electrotechnical Commission. IEC 60825-1:2007 Safety of laser products – Part 1:
Equipment classification and requirements. Geneva: IEC; Edition 2.0 (2007).
Format of decimal figures
Congruent with ISO and IEC standard regulations, a decimal comma is used in the test report in contrast
to the usual usage of a decimal point for English texts (i.e. ½ = 0,5 in this report, and not 0.5).
The product under assessment is a laser scanner emitting a collimated laser beam with a
wavelength of 1550 nm and an average power of the emitted beam of 500 mW. The laser emits
nanosecond pulses with a repetition rate so that for laser safety, the emission can be treated as
quasi-continuous and analysis is based on the average power of 500 mW.
For the wavelength of 1550 nm, IEC 60825-1 Edition 2.0 defines the Accessible Emission Limits
(AEL) for the laser safety Class 1 as 10 mW for the emission duration of larger than or equal to
10 s. The limiting aperture defined to measure the accessible emission that is compared with
the AEL is 3,5 mm in diameter. The laser beam diameter is defined to be 2,2 mm at the 1/e level
at the mirror, so that for a simplified and worst-case analysis, the complete beam can be
assumed to pass through the aperture.
For a beam that continuously rotates around a full circle, i.e. 360°, the average power does not
depend on the scanner frequency, as higher frequencies result in shorter individual pulse
duration (the time it takes to pass over the aperture) but there would be correspondingly more
pulses per seconds, which cancels each other out.
For classification, the average power needs to be determined with a 3,5 mm aperture at 100
mm from the scanning vertex (Condition 3 of IEC 60825-1). The average power detected
through the aperture is reduced from the power of the beam (500 mW) by the ratio of the
angular subtense that is subtended by the aperture as seen from the scanning vertex to 2S rad
(or 360°). The aperture subtends an angle of 3,5 mm/ 100 mm = 0,035 rad (due to the small
diameter the curvature can be neglected). A full circle subtends 2S rad = 6,28 rad. The ratio
-3
equals 5,57 10 , therefore the average power detected with the aperture equals 500 mW x 5,57
-3
10 = 2,79 mW.
The average power value of 2,79 mW is the accessible emission to be compared to the AEL for
Class 1, which is 10 mW.
NOTE: For classification as Class 1, a scanning safeguard is required according to IEC 60825-1 to limit
the power to an average value of 10 mW (averaged over 10 s), which means that the power is switched
off before the permitted average power of 10 mW is reached. This analysis assumes that such a scanning
safeguard is in place.
The accessible emission is a factor of 3,6 below the AEL of Class 1, and therefore the product
as described above can be assigned to be Class 1 according to IEC 60825-1.
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