S n ¼
@B n T
½ Š
@T
:
(2.14)
The differentiating of the Eq. 2.1 over the temperature gives the expression for
the sensitivity function:
S n ¼
abn
4
exp
bn
T
À Á À 1
Â
à 2 exp
bn
T
!
1
T
:
(2.15)
2.4 Practice 1
2.4.1 Objectives
1. Studying the blackbody spectral distribution at different temperatures.
2. Studying the spectral distribution of the Planck’s function derivative at different
blackbody temperatures.
3. Studying the spectral distribution of the safe heat radiation intensity of real body
at different temperatures with numerical simulating spectral variations of its
emissivity.
4. Studying the spectral distribution of the brightness temperature of the surface
with Planck’s function derivative at different blackbody temperatures numerical
simulating spectral variations of the surface emissivity.
2.4.2 Software and Set of Input Parameters
1. Computer programs “F_PLANCK”, “I_RADT”, setup at the directory \dz2006\Lab1.
2. The set of input parameters for programs (Table 2.1).
Table 2.1 Variants of parameter values
Number of the variant
l min , mm
l max , mm
T 1 ,
K
T 2 ,
K
T 3 ,
K
1
1
20
550
770
840
2
1
30
440
560
610
3
15
40
260
270
320
4
10
60
200
300
350
5
20
50
150
250
350
6
2
80
100
200
300
7
15
50
270
290
310
8
10
50
300
350
600
9
20
100
230
260
340
10
20
80
300
400
500
24
2 Special Features of Self-surface (Heat) Radiation Forming