A laser delivers an irradiance of 105 W/cm2 in a certain target area. If you are working in this area and the MPE for this laser is given by Table 2-3 to be 0.005 W/cm2, what is the minimum OD for the laser goggles you should be wearing?
A laser delivers an irradiance of 105 W/cm2 in a certain target area. If you are working in this area and the MPE for this laser is given by Table 2-3 to be 0.005 W/cm2, what is the minimum OD for the laser goggles you should be wearing?
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A laser delivers an irradiance of 105 W/cm2 in a certain target area. If you are working in this area and the MPE for this laser is given by Table 2-3 to be 0.005 W/cm2, what is the minimum OD for the laser goggles you should be wearing?
Transcribed Image Text:Table 2-3. MPE for Selected Lasers and Exposure Times
(Reference: ANSI Z136.1-1993)
Wavelength
MPE
Laser Type
(um)
(average power density-watts/cm?)
Exposure time in seconds
3 x 10* s
0.1 W/cm?
0.25 s
10 s
600 s
CO2
10.6
0.1 W/cm?
Nd:YAG (cw)ª
Nd:YAG (cw)
1.33
5.1 x 10-3
1.6 x 10-3
1.064
5.1 x 103
1.6 x 10-3
Nd:YAG
Q-switched
GaAs (diode)
17 x 10-3
1.9 x 103
1.064
2.3 x 10-6
0.840
610 x 10-6
INGDAIP (diode)
0.670
2.5 x 103
-
-6
-6
HeNe
0.633
2.5 x 103
293 х 10
17.6 x 10°
Кrypton
0.647
2.5 x 10-3
364 x 10-6
28.5 x 10-6
2.5 x 10-3
2.5 x 103
0.568
31 x 10-6
18.6 x 10-6
-6
0.530
16.7 x 10
1.0 x 10-6
-3
-6
2.5 x 10
-6
1.0 x 10
Argon
XEFI
0.514
16.7 x 10
0.351
33.3 x 10-6
XeCI°
0.308
1.3 x 10-6
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