An optical fiber Single/Multi-/Single-mode Intrinsic Fabry-Pérot Interferometer (SMS-IFPI) pressure sensor has been
demonstrated using a silica tube-based pressure transducer hermetically sealed by thermal fusion bonding. The sensor,
made entirely of fused silica, contains an IFPI strain sensor enclosed by a CO2 laser-bonded outer tube. A sensor
prototype is constructed and demonstrated for single point pressure sensing at high temperature (600°C), with temperature
compensation achieved through co-location of an SMS-IFPI temperature sensor. The inline geometry and low
transmission loss of the SMS-IFPI sensor makes it suitable for frequency division multiplexing (FDM) in a single fiber
branch. In future work, we envision multiplexing of up to eight such IFPI pressure sensors along a single fiber branch for
quasi-distributed pressure measurement.
Solid polymer electrolytes (SPEs) have attracted many attentions as solid state ionic conductors, because of their
advantages such as high energy density, electrochemical stability, and easy processing. SPEs obtained from starch have
attracted many attentions in recent years because of its abundant, renewable, low price, biodegradable and
biocompatible. In addition, the efficient utilization of biodegradable polymers came from renewable sources is becoming
increasingly important due to diminishing resources of fossil fuels as well as white pollution caused by undegradable
plastics based on petroleum. So N, N-dimethylacetamide (DMAc) with certain concentration ranges of lithium chloride
(LiCl) is used as plasticizers of cornstarch. Li+ can complexes with the carbonyl atoms of DMAc molecules to produce a
macro-cation and leave the Cl- free to hydrogen bond with the hydroxyl or carbonyl of starch. This competitive hydrogen
bond formation serves to disrupt the intra- and intermolecular hydrogen bonding existed in starch. Therefore, melt
extrusion process conditions are used to prepare conductive thermoplastic starch (TPS). The improvements of LiCl
concentration increase the water absorption and conductance of TPS. The conductance of TPS containing 0.14 mol LiCl
achieve to 10-0.5 S cm-1 with 18 wt% water content.
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