A pressure and temperature sensing system based on fiber-optic Bragg grating sensors for the oil and gas downhole is reported in this paper, the weak pressure sensitivity is enhanced and the cross-sensitivity of temperature and pressure measurands is overcome by an optimally designed mechanical enhancing and compensating structure, the working principle, experimental setup and testing results are also given.
Ocean surfaces should be considered as randomly rough surfaces at the IR and optical bands. The geometric model of sea surfaces has been obtained by using image processing. Based on the electromagnetic scattering theory, the Laser Radar Cross Section for the sea surfaces is analyzed at IR band and the scattering properties of the sea surfaces have been gotten.
In this paper, the constitutional characteristic and performance of an automated scattering measurement system is introduced. The angular distributions of laser scattering intensity for some rough plane samples are measured at 0.63 micrometer and 0.904 micrometer. The materials of these samples include aluminum, stell, carbon and paints. The dependence of angular intensities on dielectric constant, roughness, and wavelength are analyzed.
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