Geoscience Reference
In-Depth Information
Fig. 9.11 General view of the multi-channel spectroellipsometric system for the water quality
assessment (Krapivin et al. 2014)
recognition in radiotechnics, each optical spectrum can be represented as some
standard:
Q
D
¼
f
A
D
1
; ...;
A
D
i
; ...;
A
D
n
g;
Q
W
¼
f
A
W
1
; ...;
A
W
i
; ...;
A
W
n
g
Here Q
Δ
is the light intensity on the photodetector output, Q
ˈ
is tangent of relative
shift in phases of two orthogonal polarized components. An example of standard
structure is given in Table
9.8
. This structure is used as base of the decision making
system (BDMS). Table
9.9
gives an example of standard etalon from this base.
An identi
cation of spectral image for unknown water solution is realized by
means of comparison his vector
er with elements of the BDMS. Spectral
image of water solution can be represented by one or two vector-identi
—
identi
ers calcu-
lated with the use of rule described in Table
9.8
. Final identi
cation is realized by
Table 9.8 Structure of standard spectral image of water solution
Etalon number A
1
A
2
A
3
A
4
A
5
A
6
A
7
A
8
A
9
B
1 A
11
A
21
A
31
A
41
A
51
A
61
A
71
A
81
A
91
B
1
……
n A
1n
A
2n
A
3n
A
4n
A
5n
A
6n
A
7n
A
8n
A
9n
B
n
Notation A
1
is the square occupied by spectral curve, A
2
is the maximal value of spectral curve, A
3
is the minimal value of spectral curve, A
4
is the distance between wavelengths with minimal and
maximal values of spectral curve, respectively; A
5
is the maximal derivative of spectral curve; A
6
is
the maximal value of second derivative of spectral curve; A
7
is the number of spectral curve
maximums; A
8
is the average value of spectral curve; A
9
is the wavelength corresponded to
average value of spectral curve; B is the chemical element concentration
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