Volume 02 Issue 12-2022
73
International Journal of Advance Scientific Research
(ISSN
–
2750-1396)
VOLUME
02
I
SSUE
12
Pages:
73-78
SJIF
I
MPACT
FACTOR
(2021:
5.478
)
(2022:
5.636
)
METADATA
IF
–
7.356
A
BSTRACT
Synchronous detectors are controlled by pulses from the corresponding power generator and, therefore, a
signal is allocated that is proportional to the reflected radiation flux at the corresponding wavelength,
which is then fed to the input of the information processing unit.
K
EYWORDS
Photodetector, tissue, generator, photoresistor, detector, pulse, power supply.
I
NTRODUCTION
In addition to fluctuations in the radiation power
of the illuminator, the sensitivity of the
photodetector and the quality of the tissue
surface, the reflection coefficient of the reference
wave can be affected by the physicochemical
properties of the fibers, changes in which can thus
introduce an additional error in the moisture
measurement results.
M
ATERIALS AND METHODS
Journal
Website:
http://sciencebring.co
m/index.php/ijasr
Copyright:
Original
content from this work
may be used under the
terms of the creative
commons
attributes
4.0 licence.
Research Article
THREE-WAVE MOISTURE METER
Submission Date:
December 05, 2022,
Accepted Date:
December 10, 2022,
Published Date:
December 16, 2022
Crossref doi:
https://doi.org/10.37547/ijasr-02-12-11
Kipchakova Gavharay Mirzasharifovna
Assistant, Fergana Polytechnic Institute, Fergana, Uzbekistan
Volume 02 Issue 12-2022
74
International Journal of Advance Scientific Research
(ISSN
–
2750-1396)
VOLUME
02
I
SSUE
12
Pages:
73-78
SJIF
I
MPACT
FACTOR
(2021:
5.478
)
(2022:
5.636
)
METADATA
IF
–
7.356
In this regard, at the Department of Industrial
Electronics and Automation of MTI, the
possibility of increasing the accuracy of
measuring humidity by using radiation at three
wavelengths was investigated. As radiation
sources, LEDs based on gallium antimonide for a
wave of 1.93 µm, ternary solid solutions of
gallium antimonide and aluminum for a wave of
1.79 µm, and ternary solid solutions of gallium
and indium for a wave of 2.1 µm were used. In this
case, the reflected radiation flux with a
wavelength of 1.79
μ
m was used to compensate
for the effect of tissue thickness, temperature, and
fluctuations of the tissue surface relative to the
measuring transducer, and the reflected radiation
flux with a wavelength of 2.1
μ
m was used to
compensate for the effect of the type of fiber, i.e.
its physical and chemical properties.
As a photodetector, a photoresistor of the FSV-16-
AN brand was used, which made it possible to
obtain an agreement of IR-LED-photodetector
pairs of about 0.97 in the range of 1.7 ... 2.1
μ
m.
Since the above-mentioned LEDs, when powered
by direct current, give off power no more than 0.5
... 1 mW, they were used in a pulsed mode, which
made it possible, when powered by current
pulses of 5
μ
s duration with a repetition rate of 1
kHz, to increase the power of the radiation
emitted by them by 20-30 once. The inertia of the
used photoresistor allows a pulse modulation
frequency of up to 3-5 kHz.
Three rectangular pulse generators fed three
LEDs with pulses with different repetition rates.
The radiation fluxes of all three LEDs were fed to
the controlled tissue using molybdenum glass
LEDs, the attenuation coefficient of which is 0.04
per centimeter of length, and then, after reflection
from it, to the photoresistor. The output signal of
the photoresistor was amplified and fed to the
inputs of three synchronous detectors. Each of
these synchronous detectors is controlled by
pulses from the corresponding power generator
and, therefore, a signal is allocated that is
proportional to the reflected radiation flux at the
corresponding wavelength, which is then fed to
the input of the information processing unit.
R
ESULTS
The Fergana Polytechnic Institute has developed
a three-wave moisture meter with a functional
sweep of the emitter, which works for
translucence of a controlled object. The moisture
meter consists of an exponential voltage
generator, three LEDs (radiating at the reference,
measuring wavelengths and at a wavelength lying
on the absorption band of non-informative
parameters), a controlled object, a photodetector
and a photoelectric signal processing unit. The
use of a functional sweep in this case improves
the accuracy and simplifies the device circuit.
The moisture meter works as follows. Controlled
material or product of the irradiator with three
light fluxes from LEDs at the measuring length
λ
1
=1.93 µm and at two reference wavelengths -
respectively
λ
2
=1.83 µm and
λ
3
=2.1 µm. The flows
passing through the controlled object are defined
as:
Ф
𝜆1
= Ф
0𝜆1 𝑒
−𝑘1𝑚1
𝑒
−𝑘2𝑚2
;
Ф
𝜆2
= Ф
0𝜆2 𝑒
−𝑘1𝑚1
𝑒
−𝑘01𝑚1
;
Volume 02 Issue 12-2022
75
International Journal of Advance Scientific Research
(ISSN
–
2750-1396)
VOLUME
02
I
SSUE
12
Pages:
73-78
SJIF
I
MPACT
FACTOR
(2021:
5.478
)
(2022:
5.636
)
METADATA
IF
–
7.356
Ф
𝜆3
= Ф
0𝜆3 𝑒
−𝑘1𝑚1
𝑒
−𝑘02𝑚1
;
The following designations are adopted in the
formulas: k
1
-coefficient of scattering of the
material without moisture; k
2
- moisture
absorption coefficient; k
01
, k
02
- the absorption
coefficients of the material without moisture on
the lengths of the waves λ
2
, λ
3
, due to the
uninformative parameter (for example, the grade
of raw materials and then others); m
1
- mass of
material without moisture; m
1
–
mass of moisture.
Light flows at the supporting wavelengths change
according to the exponential law in time.
Ф
0𝜆2
= Ф
0𝜆2
∗
е
−𝑡/
𝜏
;
Ф
0𝜆3
= Ф
0𝜆3
∗
е
−𝑡/
𝜏
;
(
Ф
𝜆
02
∗
, Ф
𝜆
03
∗
- Initial light flows at the wavelengths
λ
2
,
λ
3
).
Then the light flows entering the reflector are
defined as
Ф
𝜆
2
+
Ф
𝜆
3
= Ф
𝜆
02
∗
е
−е𝑡/𝜏
е
−к
1
𝑚
1
+
Ф
0𝜆
3
е
−е𝑡/𝜏
е
−к
1
𝑚
1
е
−к
02
𝑚
1
;
Ф
𝜆
1
= Ф
0𝜆
1
е
−к
1
𝑚
1
е
−к
2
𝑚
2
.
If you level the initial light flows,
Ф
0𝜆
2
∗
= Ф
0𝜆
3
,
∗
we
will get:
Ф
𝜆
2
= Ф
𝜆
02
∗
е
−е𝑡/𝜏
е
−к
1
𝑚
1
(е
−к
01
𝑚
1
+ е
−к
02
𝑚
1
),
where
Ф
𝜆
03
=
Ф
𝜆
2
+ Ф
𝜆
3
.
The wavelength of the supporting light flows
λ
2
,
and
λ
3
is selected in such a way that the amount
е
−к
01
𝑚
1
+ е
−к
02
𝑚
1
remains constant when the
non-informative parameters are changed.
With the equality of light flows
Ф
𝜆
1
+ Ф
𝜆
3
Get
Ф
0𝜆
2
е
−к
1
𝑚
1
е
−к
2
𝑚
2
=
Ф
𝜆
02
∗
е
−к
1
𝑚
1
е
−𝑡
𝑐𝑝
/𝜏
С
1
or
K
2
m
2
=t
cp
/
𝜏
+In [
Ф
𝜆
1
/(Ф
0𝜆
2
∗
𝐶
1
)
]
Where is the mass of moisture from where
m
2
=t
cp
/(k
2
𝜏
)+C.
These formulas indicate: τ –
constant time
exhibits;
t
cp
–
time corresponding to the moment
of comparison
С=
In[
Ф
0𝜆
1
/(Ф
𝜆
02
∗
𝐶)
]/к
2
.
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