Eurasian Physical Technical Journal,
Journal Year:
2023,
Volume and Issue:
20(4 (46)), P. 111 - 115
Published: Dec. 19, 2023
The
article
is
devoted
to
a
current
topic
in
science
and
technology
-determining
the
type
concentration
of
gas
using
laser.
At
close
values
green
laser
radiation
intensity
bias
voltage,
interference
patterns
time
series
photodiode
output
signal
were
obtained.
degree
coherence
(more
than
~0.1)
made
it
possible
distinguish
between
types
gases
their
concentrations.
Signal
was
controlled
by
Allan
deviation
values.The
novelty
research
method
choice
harmonic
electrical
network
asthe
main
modulation
frequency.
It
shown
that
correlation
functions
corresponding
power
spectra
are
sensitive
low-frequency
fluctuations
molecules
clumps.
This
allows
results
methods
this
work
be
used
specific
cases
instead
large-sized
expensive
complexes
optical
instruments
at
room
pressure
temperature.
Single-layer
Graphene
(SLG)
is
a
promising
material
for
sensing
applications.
High
performance
graphene
sensors
can
be
achieved
when
Interdigitated
Electrodes
(IDE)
are
used.
In
this
research
work,
we
fabricated
SLG
micro-ribbon
(GMR)
devices
with
IDE
having
different
geometric
parameters.
1/f
noise
behavior
was
observed
in
all
of
the
examined
devices,
and
some
cases
random
telegraph
(RTN)
signals
suggesting
that
carrier
trapping/de-trapping
taking
place.
Our
experimental
results
indicate
geometrical
characteristics
have
crucial
impact
on
device
performance,
due
to
direct
area
dependence
level.
Journal of Electronic Research and Application,
Journal Year:
2024,
Volume and Issue:
8(3), P. 161 - 171
Published: June 13, 2024
Volatile
organic
compounds
(VOC)
gas
detection
devices
based
on
semiconductor
sensors
have
become
a
common
method
due
to
their
low
cost,
simple
principle,
and
small
size.
However,
with
the
continuous
development
of
materials
science,
various
new
been
applied
in
fabrication
sensors,
but
these
more
stringent
requirements
for
operating
temperature,
which
cannot
be
met
by
existing
sensor
modules
market.
Therefore,
this
paper
proposes
temperature-adjustable
module
designs
an
environmental
monitoring
system
STM32F103RET6
microprocessor.
This
primarily
utilizes
multiple
monitor
record
concentrations
harmful
gases
different
environments.
It
can
also
real-time
humidity,
latitude
longitude
current
environment,
upload
data
Internet
Things
via
4G
communication.
has
advantages
size,
portability,
cost.
Experimental
results
show
that
achieve
precise
control
temperature
certain
extent,
average
error
approximately
3%.
The
demonstrates
level
accuracy
detecting
target
promptly
cloud
platform
storage
processing.
A
comparison
professional
testing
equipment
shows
sensitivity
curves
each
exhibit
similarity.
study
provides
engineering
technical
references
application
VOC
sensors.
Eurasian Physical Technical Journal,
Journal Year:
2023,
Volume and Issue:
20(4 (46)), P. 111 - 115
Published: Dec. 19, 2023
The
article
is
devoted
to
a
current
topic
in
science
and
technology
-determining
the
type
concentration
of
gas
using
laser.
At
close
values
green
laser
radiation
intensity
bias
voltage,
interference
patterns
time
series
photodiode
output
signal
were
obtained.
degree
coherence
(more
than
~0.1)
made
it
possible
distinguish
between
types
gases
their
concentrations.
Signal
was
controlled
by
Allan
deviation
values.The
novelty
research
method
choice
harmonic
electrical
network
asthe
main
modulation
frequency.
It
shown
that
correlation
functions
corresponding
power
spectra
are
sensitive
low-frequency
fluctuations
molecules
clumps.
This
allows
results
methods
this
work
be
used
specific
cases
instead
large-sized
expensive
complexes
optical
instruments
at
room
pressure
temperature.
