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An optical fibre long period grating (LPG) modified with a thin film of HKUST-1, a material from metal organic framework (MOF) family, was employed for the detection of carbon dioxide. The sensing mechanism is based on the measurement of the change of the refractive index (RI) of the coating that is induced by the penetration of CO2 molecules into the HKUST-1 pores. The responses of the resonance...
An array of three long period gratings (LPGs) fabricated in a single optical fibre and multiplexed in the wavelength domain was used to measure simultaneously temperature, relative humidity (RH) and volatile organic compounds (VOCs). Each LPG sensor was designed to optimize its response to a desired measurand. The LPGs were fabricated with periods such that they operated at or near the phase matching...
This paper deals with methods for calculating frequency characteristics of high frequency four-terminal-pair coaxial impedance standards. An analytical calculation for coaxial resistance and capacitance standards was performed at frequencies up to 200 MHz. For verification of the used method, numerical calculations based on domain FEM (Finite element method) in low and high frequency ranges are presently...
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