An adhesive-free encapsulation sapphire Fabry–Perot interferometer (FPI) is proposed and demonstrated for high-temperature pressure measurements. The sapphire FPI sensor is packaged by zirconia ferrules and a zirconia sleeve, which is easy to be configured and low in cost. Owing to this packaging technology, the sapphire FPI sensor presents good stability and high temperature resistance. The pressure and temperature properties of the sapphire FPI sensor are investigated within a temperature range from − 50 ∘ C to 1200°C and a pressure range from 0.4 to 4.0 MPa. Experimental results show the FPI has a temperature sensitivity of 23 pm/°C and still works as the temperature is up to 1200°C. Meanwhile, the wavelength shift of the sapphire FPI versus the applied pressure is linear at each tested temperature. The pressure sensitivity is measured to be 1.20 nm/MPa at 1200°C, and the linear response shows the proposed sensor has good repeatability within 0.4–4.0 MPa. Such a sapphire FPI sensor has potential applications in engineering areas, such as the oil industry and gas boilers.

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Peer reviewed versionCyswllt i'r cyhoeddiad / Link to publication Dyfyniad o'r fersiwn a gyhoeddwyd / Citation for published version (APA):Zhang,

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Using electrodeposition of poly(hydroxyethylmethacrylate)-glycidyl methacrylate-salicylic acid (PHEMA-GMA-SA) in this study, the surface of stainless steel was modified by PHEMA to improve its surface properties of corrosion resistance and hemocompatibility for biomedical applications. Electropolymerisable SA was introduced on PHEMA-GMA by ring opening reaction of the epoxy group of GMA. Poly(hydroxyethylmethacrylate)-glycidyl methacrylate was synthesised by precipitation copolymerisation of HEMA and GMA in ethyl acetate. Ultraviolet spectrum was applied for calculating the degree of substitution of SA in the copolymer. Structure of the electrodeposited layer was verified by Fourier transform infrared. Polarisation curves and electrochemical impedance spectroscopy technologies were used to estimate the corrosion resistance of PHEMA modified stainless steel. The hemocompatibility of PHEMA modified stainless steel was determined by bovine serum albumin adsorption and platelet adhesion.