Delivery Devices and Accessories 101
Novus Spectra
0642-543-01, Rev A, 12/02
Fluence
Fluence is the measurement of energy delivered in relation to the area of the
treatment beam or energy density. Irradiance is the measurement of power
delivered in relation to the area of the treatment beam or power density. This
measurement is helpful in determining the power setting to use for a
particular treatment. Fluence and irradiance for various power and duration
settings can be calculated using the following equations:
Equation 3
Equation 4
Equation 5
Equation 6
where
Table 4 lists resulting spot sizes using approximate irradiance and fluence for
1 W of delivered power, durations of 0.5 s and 1.0 s, and a fiber diameter of
300 or 600 um.
Table 4: Irradiance and Fluence at 1 W and 0.5 s and 1.0 s Delivered
F
E
A
----
=
I
P
A
----
=
E
P
T
S
×
=
A
π
r
2
π
d
2
---
2
0.7854d
2
=
=
=
F = Fluence (J/cm
2
)
T
s
= Time duration in seconds (s)
I = Irradiance (W/cm
2
)
A = Spot size area in cm
2
E = Energy (J)
d = Spot diameter
J = Joules
r = Spot diameter ÷ 2
P = Power out of fiber in watts (W)
Fiber Diameter
(µm)
Spot Size
(mm)
Spot Size Area
(cm2)
Irradiance (W/
cm2)
Fluence at 1 s (J/
cm2)
Fluence at 0.5 s (J/
cm2)
300
(0.3 mm or.03 cm)
0.3
.000707
1415
1415
707
3.0
.0707
14
14
7
600
(0.6 mm or.06 cm)
0.6
.00283
354
354
177
3.0
.0707
14
14
7
Summary of Contents for Novus Spectra
Page 1: ...Novus Spectra Solid State 532 nm Green Laser Operator Manual...
Page 6: ...6 Contents Novus Spectra 0642 543 01 Rev A 12 02...
Page 8: ...Novus Spectra 0642 543 01 Rev A 12 02 8 General Operation...
Page 40: ...Novus Spectra 0642 543 01 Rev A 12 02 40 General Operation...
Page 42: ...Novus Spectra 0642 543 01 Rev A 12 02 42 Maintenance...
Page 56: ...Novus Spectra 0642 543 01 Rev A 12 02 56 Safety and Regulatory...
Page 72: ...Novus Spectra 0642 543 01 Rev A 12 02 72 Indications for Use...
Page 110: ...Novus Spectra 0642 543 01 Rev A 12 02 110 Indications for Use...
