Sensors,
Год журнала:
2024,
Номер
24(24), С. 7998 - 7998
Опубликована: Дек. 14, 2024
Smart
concrete
is
a
structural
element
that
can
combine
both
sensing
and
capabilities.
In
addition,
smart
monitor
the
curing
of
concrete,
positively
impacting
design
construction
approaches.
if
process
not
well
developed,
may
develop
cracks
in
this
early
stage
due
to
shrinkage,
decreasing
mechanical
strength.
paper,
system
measurement
using
fiber
Bragg
grating
(FBG)
sensors
for
monitoring
was
developed
evaluate
autogenous
shrinkage
strain,
temperature,
relative
humidity
(RH)
single
system.
Furthermore,
K-type
thermocouples
were
used
as
reference
temperature
sensors.
The
results
presented
maximum
strains
213.64
με,
125.44
173.33
με
FBG4,
FBG5,
FBG6,
respectively.
Regarding
humidity,
measured
98.20
%RH,
which
reached
before
10
h.
case,
recorded
63.65
°C
61.85
by
FBG2
thermocouple,
Subsequently,
specimen
with
FBG
strain
sensor
embedded
underwent
bend
test
simulating
beam
behavior.
transform
simple
structure
like
into
structure,
sensors’
signal
maintained
entire
applied
load
cycles
compared
superficially
positioned.
test,
measurements
85.65
123.71
56.38
on
FBG7,
FBG8,
FBG3,
respectively,
FBG3
also
strain.
Therefore,
confirm
proposed
cited
parameters
throughout
concrete.
Journal of Modern Optics,
Год журнала:
2024,
Номер
unknown, С. 1 - 9
Опубликована: Ноя. 17, 2024
In
this
paper,
a
composite
fibre
structure
based
on
thin-core
(TCF),
Fibre
Bragg
grating
(FBG),
and
micro-nano
(MNF)
is
proposed
to
achieve
simultaneous
sensing
of
humidity,
temperature,
hydrogen
concentration
by
coating
different
functional
films.
Based
surface
plasmon
resonance
(SPR),
TCF
Au/PVA
film
are
combined
relative
humidity
(RH)
measurement.
Pt/MOF-5
coated
the
MNF
in-situ
growth
method.
Its
refractive
index
(RI)
changed
absorbing
hydrogen.
temperature
detection,
FBG
realizes
compensation.
above
mechanisms,
it
shown
that
has
RH
sensitivity
0.38
nm/%RH,
−0.0497
nm/°C,
0.541
nm/%.
The
0.0106
which
accurately
compensates
for
crosstalk.
This
provides
good
application
prospect
accurate
measurement
concentration.
