In this paper, a dual-parameter sensor based on surface plasmon resonance (SPR)-photonic crystal fiber (PCF) is proposed, which can be applied in detecting the magnetic field and temperature. sensor, two elliptical channels are designed both sides of core. The left channel (Ch 1) coated with gold film filled fluid (MF) to achieve response temperature using SPR. right 2) as well Ta2O5 improve SPR sensing performance. Finally, Ch 2 polydimethylsiloxane (PDMS) mode characteristics, structural...

An all optical fiber CTD sensor used in seawater based on an OMC is demonstrated. And the fabricated by fusing and tapering two twisted conventional communication fibers improved flame-brushing method. By monitoring sensing dips, situ measurement of salinity, temperature, depth (pressure) can be realized, respectively. Especially, water function demonstrated for first time, pressure sensitivity 50 times higher than a bare Bragg grating (with wide range from 0 to 25 MPa). The highest...

Based on the polymer encapsulation method, a compact structure and high-sensitivity temperature pressure dual parametric sensor was developed in this paper by wrapping an optical microfiber coupler (OMC) polydimethylsiloxane (PDMS). Benefiting from stable chemical properties good field control ability of PDMS, showed stability repeatability. The dependence sensitivity wavelength, temperature, experimentally investigated. results that could reach -2.283 nm/°C 3.301 nm/Mpa C-band range. To...

In the field of physical oceanography, temperature and pressure seawater are important fundamental parameters. order to realize simultaneous measurement in seawater, a reflective optical fiber sensor based on polydimethylsiloxane (PDMS)-sealed microfiber coupler combined with sagnac loop (OMCSL) is proposed. Benefiting from high thermo-optical coefficient large elasticity PDMS, large-scale swift transmission characteristics (OMC), sensitivity structural stability our largely improved. The...

An optical fiber with both temperature and strain Bragg grating sensors were embedded into an aluminum cast structure during the casting process. Temperature calibrations carried out respectively for metal-embedded sensors. external decoupling was further demonstrated in a range from 25 to 80 °C 0 ∼110 µɛ. With interpolated measured by two at different positions, could be decoupled thermal sensor. The values obtained our agreed well reference values, revealing good performance of difference...

Metal coatings can protect the fragile optical fiber sensors and extend their life in harsh environments. However, simultaneous high-temperature strain sensing a metal-coated remains relatively unexplored. In this study, nickel-coated Bragg grating (FBG) cascaded with an air bubble cavity Fabry-Perot interferometer (FPI) optic sensor was developed for high temperature sensing. The successfully tested at 545 °C 0-1000 µɛ, characteristic matrix used to decouple strain. metal layer allows easy...

Abstract A novel optical fiber hydrogen sensor based on the π -phase-shifted grating and partial coated Pd/Hf composite film is proposed experimentally demonstrated in this paper. The sensitive with length of 4 mm successfully deposited region by magnetron sputtering process rotating fixture technology. Since sensitivity between notch flank wavelengths different due to coating only region, relative shift employed characterize concentration calibration results show that shows good response...

Human skin is remodeled as a result of aging. Retinoids (or retinol derivatives) can intervene in this process, which be optimally formulated and concentrated by providing maximum antiaging effects with minimal irritation. To determine the optimal ratio two derivatives hydroxypinacolone retinoate (HPR), propionate (RP), vitamin C (VitC) dermal remodeling preventing aging, to investigate their synergistic whitening vitro vivo. An model human fibroblast (HSF) was established evaluate cellular...

In-situ temperature and strain during copper casting process were monitored for the first time based on regenerated fiber Bragg grating (RFBG) sensors, with maximum up to 1100 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$^{\circ }$</tex-math></inline-formula> C largest compressive approximately −14 000 notation="LaTeX">$\mu$</tex-math></inline-formula>...

To improve the sensing performance of optical fiber magnetic field sensor based on magneto-refractive effect, a D-shaped photonic crystal fiber-surface plasmon resonance (PCF-SPR) effect is proposed and its characteristics are investigated. The designed PCF has core-analyte-gold structure. Within PCF, side polishing surface coated with gold film special hole sandwiched between core film. realize high sensitivity for SPR sensor, filled fluid (MF). In this paper, we analyze mode transmission...

A novel, to the best of our knowledge, sensor architecture for palladium-coated fiber Bragg gratings is proposed and demonstrated that allows highly accurate multi-parameter sensing decoupling hydrogen concentration from temperature. By means partly Pd-coated Pi-shifted FBGs (PSFBGs), notch wavelength narrow transmission band flank broader reflection experience different temperature sensitivities. PSFBGs were calibrated at concentrations between 800 10,000 ppm temperatures 20 40°C, a...

Regenerated fiber Bragg gratings (RFBGs) have been created in large mode area (LMA) fibers, and their key properties for application as high-temperature sensors were experimentally characterized. UV written Type-I seed standard single-mode fibers (SMF-28) low numerical aperture LMA with 125 μm 250 cladding diameters regenerated, wavelength drift characteristics at high temperatures, temperature sensitivities, mechanical strengths tested compared each other. We found that dopant...

The high-temperature performance of a sapphire fiber Bragg grating (FBG) has been characterized by commercial single-mode interrogator. By using the mode field matching fusion splicing method, we proposed before, high-order modes in reflection spectrum FBG could be suppressed and quasi-single-mode obtained from fiber-based demodulation system. A 48-h isothermal annealing at 900 °C two temperature calibration processes, one up to 800 another 1200 °C, were carried out successively. There was...

Pd-based alloy coating on optical fiber is widely employed for hydrogen concentration sensing. However, it difficult to distinguish the expansion from adsorption or thermal effect. In this article, a novel fiber-optic sensor based <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\pi $ </tex-math></inline-formula> -shifted Bragg grating (FBG) with locally coated Pd/Ta layer, which enables an in situ...

Solving the multimode issue of sapphire fiber is great significance for improving performance and extending application fields fiber-based high-temperature sensors. Here, a mode field matching fusion splicing method between single-mode was reported to obtain quasi-single reflection spectrum from Bragg grating (SFBG). By optimizing parameters, an overlapped double conical (ODC) structure could be formed. The well achieved by this structure, realizing suppression high-order modes in spectrum....

In the process of ocean exploration, highly accurate and sensitive measurements seawater temperature pressure significantly impact study seawater's physical, chemical, biological processes. this paper, three different package structures, V-shape, square-shape, semicircle-shape, are designed fabricated, an optical microfiber coupler combined Sagnac loop (OMCSL) is encapsulated in these structures with polydimethylsiloxane (PDMS). Then, response characteristics OMCSL, under analyzed by...

The pressure and temperature of seawater are two important parameters. At present, people mainly rely on various types depth measurement instruments to monitor the seawater. Optical temperature–depth (TD) sensors have advantages such as antielectromagnetic interference, corrosion resistance, multiplexing capability. By using polydimethylsiloxane with a high thermo-optical coefficient elastic-optical encapsulate optical microfiber coupler combined sagnac loop (OMCSL) structure large abrupt...

As technology feature size decreases, single event upset (SEU), and transient (SET) dominate the radiation response of microcircuits. Multiple bit (MBU) (or multi cell upset) effects, digital (DSET) analogue (ASET) cause serious problems for advanced integrated circuits (ICs) applied in a environment have become pressing issue. To face this challenge, lot work has been put into soft error mechanism mitigation schemes. This paper presents review SEU SET, including: brief historical overview,...

A new calibration methodology for regenerated fiber Bragg grating (RFBG) temperature sensors up to 700 °C is proposed and demonstrated. generalized, wavelength-dependent function experimentally determined that describes the temperature-induced wavelength shifts all RFBG sensor elements are manufactured with same fabrication parameters in range from 1465 nm 1605 nm. Using this generalized absolute measurements, each element only needs be calibrated at one reference temperature, representing a...