Volume 03 Issue 01-2023
58
International Journal of Advance Scientific Research
(ISSN
–
2750-1396)
VOLUME
03
I
SSUE
01
Pages:
58-64
SJIF
I
MPACT
FACTOR
(2021:
5.478
)
(2022:
5.636
)
A
BSTRACT
The article considers a gas analyzer based on an optoelectronic two-wave generator in which optical
feedback is used through a gas chamber. At the output of the generator of a positive pulse, optical feedback
is provided at a wavelength of
1
and at a negative one -
2
.
K
EYWORDS
Generator, gas chamber, wavelength, LED, divider, impulse, radiation, spectral characteristic.
I
NTRODUCTION
With low requirements for control devices, a
simple optoelectronic two-wave generator circuit
can be used. Two-wave optoelectronic generators
with two optocouplers can be successfully used to
create portable gas analyzers for continuous
monitoring of the degree of environmental
pollution [1-7].
T
HE MAIN PART
The structural gas chamber of the optoelectronic
two-wave generator is a hollow tube (Fig. 1), the
inner surface of which has good reflectivity. At
one end of the gas chamber, semiconductor
emitters SD1 and SD2 are installed, respectively,
with radiation wavelengths of
1
and
2
, and at
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
APPLICATION OF OPTOELECTRONIC TWO-WAVE GENERATOR
Submission Date:
January 20, 2023,
Accepted Date:
January 25, 2023,
Published Date:
January 30, 2023
Crossref doi:
https://doi.org/10.37547/ijasr-03-01-10
Madmarova Umida Abdukarimovna
Senior Lecturer, Department Of “Metrology, Standardization And
Product Quality Management”, Fergana
Polytechnic Institute, Fergana, Republic Of Uzbekistan
Volume 03 Issue 01-2023
59
International Journal of Advance Scientific Research
(ISSN
–
2750-1396)
VOLUME
03
I
SSUE
01
Pages:
58-64
SJIF
I
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FACTOR
(2021:
5.478
)
(2022:
5.636
)
the other end, a photoresistor FR is installed, the
spectral characteristic of which allows recording
radiation from both sources. The choice of source
type with the corresponding
1
and
2
is
determined by the spectral characteristic of the
controlled gas component [8-24].
A schematic diagram of an optoelectronic two-
wave generator is shown in fig. 2. The principle of
operation of the generator is based on the use of
a photoresistor in the feedback circuit, optically
connected through a controlled medium with an
LED connected in anti-parallel at the output of the
generator [25-41].
In the absence of a controlled substance (gas,
smoke, etc.), by turning the knobs of the variable
resistors R
1
R
2
and selecting the divider R
4
and R
5
at the output of the amplifier, the pulse durations
of positive and reverse polarity are equal.
Fig.1. The design of the gas chamber of the gas analyzer.
In the presence of a controlled substance, the
duration of a pulse of one polarity changes. The
duration of a pulse of a different polarity depends
on the values of non-informative parameters,
since the wavelength of this LED lies outside the
absorption band of the controlled parameter.
Volume 03 Issue 01-2023
60
International Journal of Advance Scientific Research
(ISSN
–
2750-1396)
VOLUME
03
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Pages:
58-64
SJIF
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Fig. 2. Schematic diagram of a gas analyzer based on an optoelectronic two-wave generator.
Thus, the generator continuously generates a
periodic sequence of rectangular pulses of
different polarity [42-57]. The duration of a pulse
of one polarity, for example, positive, depends on
the controlled parameter, and the duration of a
pulse of negative polarity depends on non-
informative parameters (for example, when
monitoring gas contamination, pollution, etc.). It
should be noted that when the background
illumination and temperature change, only the
pulse repetition frequency of the generator
changes and the ratio of the pulse durations of
positive and negative polarity depends only on
the value of the controlled parameter.
To implement the ratio of the durations of these
pulses, a device made on a field-effect transistor
VT
1
and an operational amplifier D
2
is connected
to the output of the D
1
microcircuit. The
separation of pulses of negative and positive
polarity is carried out by diodes VD
3
and VD
4
.
Further, the separated pulses are integrated by
the chains R
6
C
2
and R
7
C
5
. The value of the
controlled parameter is recorded by the
measuring device - power source.
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