




IR Radiation and Accuflect^{®} IR
Quick Notes
1. Emitter power density varies with the fourth power of temperature
M=AεσT^{4}
where:
M=power density in W/m^{2}
A=radiating surface area in m^{2}
ε=emissivity factor
σ=Stefan Boltzman Constant in Wm^{2}T^{4}
T=absolute temperature in °K
Takeaway: Changes in temperature dramatically
affect power density
2. Wavelength of peak emission varies
inversely with temperature (Wiens displacement law)
λ_{max}=cT^{1}
where:
λ_{max}=peak
emission wavelength in microns
c=constant 2898 µm·°K
T=absolute temperature °K
Takeaway: emitter can be "tuned" to match
absorption spectrum of the receiver
3. Received power is proportional to distance
for some source types
Point Source
P proportional
to r^{2}
Line Source
P proportional
to r^{1}
Planar Source
P independent
of r
where:
r=source to receiver distance
Takeaway: Accuflect IR provides a planar
source where distance between source and receiver is not critical nor requires
specially shaped reflectors
4. Radiative transfer for a planar source
P=εσA_{e}F(T_{e}^{4}T_{r}^{4})
where:
P=power in W
ε=source emissivity factor
σ=Stefan Boltzman constant Wm^{2}T^{4}
A_{e}=emitter
area in m^{2}
F=view factor for receiver (as seen from
emitter)
T_{e}=emitter
absolute temperature °K
T_{r}=receiver
absolute temperature °K


Back to top.

Standard Products  Custom Products and Services
 Case Studies  Materials
Design Notes
 Working Together  Vision
 Contact Us
 Site Map
19082137070
© 2013 Accuratus
Site Design M. Adams



