In order to achieve nondestructive analysis of liquid samples, the spectral analysis of solution in a flexible container is proposed in this paper. However, the difference in the flexible containers reduces the accuracy of the spectral analysis. By analyzing the relationship between the condition number of coefficient matrix (CNCM) and the solution accuracy, a method of reducing CNCM by multi-pathlength spectrum is proposed to reduce the error caused by the differences in flexible containers. To verify the feasibility of the method, different concentrations of samples were prepared with intralipids and India-ink, and polyvinyl chloride sample tubes were used as the flexible container. The experimental results show that the proposed strategy can effectively reduce the error caused by the differences in flexible containers.

1.
G.
Bázár
,
R.
Romvári
,
A.
Szabó
,
T.
Somogyi
,
V.
Éles
, and
R.
Tsenkova
, “
NIR detection of honey adulteration reveals differences in water spectral pattern
,”
Food Chem.
194
,
873
880
(
2016
).
2.
S. R.
Delwiche
and
R. A.
Graybosch
, “
Binary mixtures of waxy wheat and conventional wheat as measured by NIR reflectance
,”
Talanta
146
,
496
(
2016
).
3.
C.
Fan
, “
Spectral analysis of water reflectance for hyperspectral remote sensing of water quailty in estuarine water
,”
J. Geosci. Environ. Prot.
2
,
19
27
(
2014
).
4.
G.
Li
,
Z.
Zhao
,
R.
Liu
,
H. Q.
Wang
,
H. J.
Wu
, and
L.
Lin
, “
[Research on the blood components detecting by multi-optical path length spectroscopy technique]
,”
Spectrosc. Spectral Anal.
30
,
2381
2384
(
2010
).
5.
G.
Li
,
Y. S.
Luo
,
Z.
Li
,
Z.
Li
, and
L.
Lin
, “
Multi-pathlength method to improve the spectrometric analysis accuracy based on ‘M+N’ theory
,”
RSC Adv.
6
,
38849
38854
(
2016
).
6.
S.
Zhang
,
G.
Li
,
J.
Wang
,
D.
Wang
,
Y.
Han
,
M.
Liu
, and
L.
Lin
, “
Reduction of package-induced error for the composition analysis of in-package liquid products based on transmission spectrum
,”
RSC Adv.
7
,
26729
26734
(
2017
).
7.
G.
Li
,
Z.
Li
,
X.
Li
,
L.
Lin
,
B.
Zhang
, and
W.
Wang
, “
Study on effect of source voltage on the accuracy of quantitative spectral analysis based on ‘M+N’ theory
,”
Spectrosc. Spectral Anal.
33
,
1456
1461
(
2013
).
8.
L.
Zhe
,
J.
Feng
,
P.
Liu
,
Z.
Sun
,
L.
Gang
, and
K.
Jia
, “
Improving the spectral measurement accuracy based on temperature distribution and spectra-temperature relationship
,”
Infrared Phys. Technol.
90
,
87
(
2018
).
You do not currently have access to this content.