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A fiber optic sensor for simultaneous measurement of temperature and strain is demonstrated, based on a few-mode solid-core photonic crystal fiber. In the core of the few-mode fiber, the fundamental mode and the first higher order mode are co-excited, when coupling light from a collapsed end, through a single-mode fiber. Mach-Zehnder interferences between the two core modes and one possible cladding...
A sensitivity-enhanced temperature sensor for marine monitoring based on fiber Bragg grating (FBG) has been proposed and experimentally investigated. The temperature sensor has been realized by electroplating a copper coating on a metalized FBG. Then, the coated FBG is packaged by a carbon film, which protects the copper coating from being corroded when the sensor is used in the ocean. The carbon...
This letter puts forward weak FBGs Fabry-Perot (FP) structures with copper coating for quasi-distributed temperature measurement. The weak FBGs (−33dB) are fabricated by on-line draw tower. The sensors system exhibits the superiorities of high signal to noise ratio (SNR). At the same time, wavelength/frequency/time multiplexing immensely increases the capacity of the sensing system. In the experiment,...
A distributed vibration sensing system with Michelson interferometer based on width-band ultra-weak fiber Bragg grating (UWFBG) arrays in Draw Tower Grating (DTG) is proposed and experimentally demonstrated. The precise of the space between adjacent UWFBG is less than 1mm, which is conducive to precise positioning and rapid demodulation. The system is capable of measuring vibrations of up to 1 kHz...
A novel method was proposed to improve hydrogen sensitive performance of fiber Bragg grating (FBG) hydrogen sensor. The hydrogen performance of the sensor can be greatly improved by using WO3-Pd2Pt-Pt composite films as sensing element. The high reflective Bragg gratings was written in single mode fiber. The end-face of single mode fiber was deposited with WO3-Pd2Pt-Pt composite films as sensing element...
The continuous three-dimensional curved track measurement system (CTMS) based on vehicular strapdown inertial navigation system (SINS) and four odometers is firstly presented and validated in order to achieve rapidly the long span curve measurement for bridge health monitoring. The line-shape measurement is conducted on a viaduct. Experimental results show that the Z-axis and Y-axis error in comparison...
A distributed acoustic sensing system (DAS) with low-coherence ASE and Michelson interferometer based on continuous width-band ultra-weak fiber Bragg grating (UW-FBG) array is proposed and experimentally demonstrated. The experimental result shows that the proposed system has better performance in detecting acoustic waves than the conventional hydrophone.
The research on engineering experiment is a key step in translating technical development to industrial application. Wuhan University of Technology (WUT) and its spin-off, WUTOS Company is among the main roles of optical fiber sensing development in China. According to our practical experience for more than 30 years and some applications of the fire alarm system, bridge, coal and power safety ensuring...
Fiber-optic hydrogen sensor based on palladium-coating assisted with actively optical heating is proposed and experimentally demonstrated. Compared to normal sensor configuration without optical heating, proposed system shows improved hydrogen sensitivity, also with faster response time.
A kagomé-lattice hollow-core photonic crystal fiber was fabricated, and based on it, a refractive index and temperature surface plasmon resonance sensor is proposed. The sensor consists of a layer of gold nanoparticles over the inner surface of the fiber core. Verified by theoretical calculations, the sensor possesses refractive index sensitivity of 1495 nm/RIU with resolution of 1.34×10−5 and temperature...
Optical thin films can be deposited on side- and end-face of optical fiber, if these films are sensitive to ambient environments, optical refractive index changes in thin films will finally result to variation of optical signals transmitted in the optical fiber. Here thin films work as sensitive elements and transducer to get response and feedback from environments, optical fiber here are employed...
A fiber-optic hydrogen gas sensor using composite palladium and tungsten trioxide (WO3) was proposed and characterized. This sensor utilizes the absorption of the evanescent field interaction in the clad of Pd/WO3 thin film which was prepared by magnetron co-sputtering process, coated on a silica core. Modulation of optical power intensity is observed, a clear increase of power with hydrogen and decrease...
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