Safety Practices . 25
Calculation of Nominal Hazard Zones for use of Fiber Optic Probe
The following calculations show how to calculate a nominal hazard zone. These calculations
are taken from ANSI Z136.1-1933. A laser safety officer uses these calculations to help
define how to use your Raman probe safely in your environment.
Figure 4 Probe parameters used to calculate the nominal ocular hazard distance
The equation for a focused beam as given here (Figure B5 in ANSI Z136.1-1933) is used to
calculate the nominal ocular hazard distance (NOHD) for the fiber optic probe. The equation
is:
2
1
.
Π
Φ
4
=
MPE
b
f
NOHD
o
o
Where:
f
o
= Probe focal length (cm)
b
o
= Diameter of laser beam incident on probe focusing lens (mm)
Φ
= Total radiant output power of probe (watts)
MPE
=
Maximum permissible exposure (J cm
−2
)
For the FOP
b
o
is 0.254 cm, therefore the above equation can be simplified to give:
2
1
Φ
.
442
.
4
=
MPE
f
NOHD
o
For the wavelength range 700–1050 nm the
MPE
for a 10 second exposure can be calculated
from:
(
)
(
)
(
)
[
]
4
7
.
0
2
10
10
1
.
10
−
−
=
λ
MPE
J cm
−2
b
o
f
o
NOHD
Содержание Raman Micro 200 Series
Страница 1: ...RamanMicro 200 Series Getting Started Guide MOLECULAR SPECTROSCOPY...
Страница 5: ...Introduction...
Страница 10: ...10 RamanMicro 200 Series Getting Started Guide...
Страница 11: ...Safety Practices...
Страница 29: ...Raman History Theory and Instrumentation...
Страница 35: ...Preparing Your Facility...
Страница 41: ...Installing Your RamanMicro 200...
Страница 76: ...76 RamanMicro 200 Series Getting Started Guide...
Страница 77: ...Using the RamanMicro 200...
Страница 103: ...Maintenance and Troubleshooting...
