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A novel rotational speed sensor consisting of a fiber Bragg grating is proposed. As the grating glued to the surface of a metal rod was driven by a disc, the grating wavelength was shifted back and forth to cause the change of reflection power for measuring the frequency of on-off change for obtaining the rotational speed.
We present a novel high-sensitivity dual-axis fiber inclinometer based on two etched chirped fiber Bragg gratings arrays capable of measuring the tilted angle and the direction of tilting simultaneously with a resolution of 0.02°.
we proposed a novel high-sensitivity dual-axis fiber inclinometer based on two etched chirped fiber Bragg gratings(CFBGs) with the CFBG1-sensitivity of 0.245 nm/degree and CFBG2-sensitivity of 0.215 nm/degree respectively.
Surface-normal radiation of 45° tilted fiber gratings are fabricated and measured. A 3-minute exposure time of tilted FBGs can cause −15dB radiation efficiency, while a 1.5-minute exposure time can create the radiated efficiency of −16.2dB.
A fiber sensor by using a FBG cascaded a LPG for the simultaneous measurement both of the concentration and temperature of glucose solution is experimentally demonstrated by monitoring the variation of the reflective wavelength and the reflective power.
In this paper, we present two different types of pressure sensors including a high-sensitivity lateral pressure sensor and a temperature-independent differential pressure sensor by using fiber Bragg gratings to be encapsulated in a polymer-half-filled metal cylinder. The schematic diagram of lateral pressure sensor is shown in Fig.1 which operating mechanism is based on transferring radial pressure...
A new rotational angle sensor composed of two FBGs glued axially on a metal-rod surface driven bent by attraction of a magnetic disk is proposed. Whenever an external force is applied in the end of this sensor, these two FBGs undergo a strain caused by a shaft rotation to result in their central wavelength shifts respectively. This sensor can precisely to detect the random rotation angle in both static...
In this paper, we use the coupled-mode theory (CMT) to analyze the FBGs. The theoretical and experimental results of the first order fiber Bragg gratings (FBGs) are presented, and show in good agreement.
This paper has successfully achieved a new type optomechanical rotational angle sensor which consists of two FBGs glued axially on a capillary surface that is driven bent by attraction of a magnetic disk. Whenever an input force exerts on the end of this sensor, these two FBGs undergo strain caused by shaft rotation and result in their central wavelength shifts respectively. This sensor can be used...
A simple, small-size, compact and high-sensitivity refractive-index sensor composed of a short no-core fiber (NCF) about 20 mm in length sandwiched between two pieces of single-mode fibers is proposed in this paper. The index measurement is experimentally demonstrated with the sensitivity of 7792.85 nm/ RIU in the range from 1.440 to 1.454 and 227.14 nm/ RIU in the range from 1.300 to 1.430. This...
A fiber micro-bending sensor is presented with multimode interference effects created by splicing a piece of no-core fiber between two single-mode fibers. The micro-bending measurement is experimentally demonstrated with a sensitivity of −183.788 nm/m−1.
Light is successfully coupled into the fiber by using second-order FBGs. The measured power from the two ends of the FBGs are 10.715 nW and 10.233 nW, respectively, with an input power of ∼12 mW.
We present new temperature sensing devices based on side-polished Fiber Bragg Gratings (FBGs) coated with TiO2, Fe and Pd thin films. The temperature sensing mechanism was based on the wavelength shift of the returned Bragg signal, as measured by an optical spectrum analyzer (OSA). The Bragg grating wavelength shift of the reflected optical signal is a function of the environmental temperature, which...
A fiber PH sensor based on an air-gap long period fiber grating (AG-LPG) in a multi-modes fiber is proposed with the sensitivity of −0.219 nm/pH and 0.248 nm/ pH for measuring the acid and alkaline solutions respectively. The operating mechanism is based on the index of different pH-value solutions to cause the grating loss-dip wavelength shift due to the change of the effective index both in core...
This paper demonstrates an optical fiber sensor using a fiber Bragg grating (FBG) to measure real and reactive powers. The sensor head is based on FBG encapsulated in a metal cylinder embedded a magnetic material at measure point. The operating mechanism is the sensor can be attracted by the induced magnetic force created by the apparent power in the solenoid along only one radial direction and responds...
A novel rotational-position sensor consists of two FBGs glued axially on a capillary surface and driven bent by attraction of a magnetic disk, which accurately detects random rotation angle in both static and dynamic conditions.
A tilt-meter consists of two long-period gratings mounted axially on the inner wall of a cylindrical container and has a nice linearity in the tilt range from 0 to +20 degree in a random direction.
This paper demonstrates an optical fiber sensor using fiber Bragg grating (FBG) and a piezo-electrical transducer (PZT) to measure reactive current. Mounting an FBG on a PZT bar, a dynamic strain simulator was constructed. The equivalent voltage produced by reactive current applied on PZT was converted to the dynamic variation of the FBG Bragg wavelength. The reactive current will be achieved by measuring...
A novel optical-fiber sensor based on air-gap long-period fiber grating with a coated zinc-oxide thin-film is proposed for detecting the diallyl disulfide and thiol, which are the main volatile organic compounds ingredients of the pepper.
A high-sensitivity refractive index sensor composed of a short piece of no-core fiber spliced between two single-mode fibers is experimentally demonstrated with the sensitivity of 7792.85 nm/RIU.
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