Instrumentation & Measurement Magazine 24-5 - 80

Fig. 4. The optical pressure sensor. (a) The two FBG sensors glued on the steel circular membrane (with the hydraulic seal on top) and the rectangular steel piece;
(b) A top view of the membrane placed inside the fitting; (c) The final assembled pressure sensor.
of the optical system. Finally, stainless steel 316L with a thickness
of 500 μm is easy to find on the market.
The FBG sensors were glued on the steel by the technicians
of HBM FiberSensing in Porto, Portugal and assisted
the researchers of the DIEEI at the University of Catania, Italy
during the device assembly. Fig. 4a and Fig. 4b show two
different moments during the sensor assembly: the two FBG
sensors glued on the steel circular membrane (with the hydraulic
seal on top) and the rectangular steel piece (Fig. 4a) and
a top view of the device in an intermediate step with the membrane
placed inside the fitting. The final assembled device is
shown in Fig. 4c. The optical fiber was protected with a flexible
plastic jacket.
The optical pressure sensor was experimentally characterized
on a test plant, shown in Fig. 5a, built at the Idragest srl site
where it was suitable to reproduce the range of pressures, the
flows, and vibrations to be measured. Fig. 5b shows the sensor
connected to the socket of the plant, while Fig. 5c shows the
reference pressure sensor used in the plant to monitor the pressure
inside the pipes and the graphic interface developed in NI
LabVIEW for the acquisition and processing of the optical signal
from the optical interrogator.
The experimental characterization of the sensor aimed to
estimate the metrological characteristics in the pressure range
(0-6) bar [30]. Fig. 6 shows the sensor calibration diagram with
the relative uncertainty range obtained from ten repeated
measurements and considering a coverage factor k = 3. An experimental
sensor accuracy σ = 39 mbar was estimated. The
accuracy of the prototype was largely lower than the requested
specifics. Moreover, Fig. 6 confirms the expected linear behavior
of the sensor in the range of pressure of interest. The
calibration curve (linear) and the associated analytical model
were also reported.
The main metrological characteristics of the developed
prototype of the pressure sensor, sensitivity S, accuracy σ,
and resolution dP are reported in Table 4. Specifically, the
Fig. 5. (a) The test hydraulic plant built at the Idragest srl site; (b) The sensor connected to the clamp socket of the plant; (c) The reference pressure sensor used
in the plant to monitor the pressure inside the pipes and the graphic interface developed in NI LabVIEW for the acquisition and processing of the optical signal
from the optical interrogator.
80
IEEE Instrumentation & Measurement Magazine
August 2021

Instrumentation & Measurement Magazine 24-5

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