A simple fiber sensor to measure angular displacement with high resolution, which is based on whispering gallery mode （WGM） resonance in bent optical fibers,is proposed. The sensor is composed of a single loop forme...A simple fiber sensor to measure angular displacement with high resolution, which is based on whispering gallery mode （WGM） resonance in bent optical fibers,is proposed. The sensor is composed of a single loop formed by loosely tying a knot using single mode fiber. To measure the transmission spectra, a tunable laser and an optic power meter are connected to the two ends of fi- ber loop, respectively. Significant WGM resonances occur over the investigated wavelength range for all the sensors with different bend radius. The angular-displacement sensitivity is studied in the range from -0. 1°to 0. 1°. The detection limit of 1.49 × 10 ^-7 rad can be achieved for the detecting system with the resolution of lpm. The simple loop-structure fiber sensor has potential application prospect in the field of architecture or bridge building with low detection limit and low cost.展开更多
A novel fiber optics micredisplacement sensor employing a GRIN rod lens is described. The paper presents the operational principle of this device using a geometric optic approach. According to the theoretical analysis...A novel fiber optics micredisplacement sensor employing a GRIN rod lens is described. The paper presents the operational principle of this device using a geometric optic approach. According to the theoretical analysis, we know how to select the parameters of the GRIN rod lens,fibers and other elements in design. DUe to the novel structure, the displacement sensitivity of this sensor is better than the conventional lateral microdisplacment sensor, by a factor of 2.展开更多
基金Supported by the National Basic Research Program of China （ ＂973＂ Program） （ 2011 CB013000 ） the National Natural Sci- ence Foundation of China （NSFC） （ 90923039 51105038）
文摘A simple fiber sensor to measure angular displacement with high resolution, which is based on whispering gallery mode （WGM） resonance in bent optical fibers,is proposed. The sensor is composed of a single loop formed by loosely tying a knot using single mode fiber. To measure the transmission spectra, a tunable laser and an optic power meter are connected to the two ends of fi- ber loop, respectively. Significant WGM resonances occur over the investigated wavelength range for all the sensors with different bend radius. The angular-displacement sensitivity is studied in the range from -0. 1°to 0. 1°. The detection limit of 1.49 × 10 ^-7 rad can be achieved for the detecting system with the resolution of lpm. The simple loop-structure fiber sensor has potential application prospect in the field of architecture or bridge building with low detection limit and low cost.
文摘A novel fiber optics micredisplacement sensor employing a GRIN rod lens is described. The paper presents the operational principle of this device using a geometric optic approach. According to the theoretical analysis, we know how to select the parameters of the GRIN rod lens,fibers and other elements in design. DUe to the novel structure, the displacement sensitivity of this sensor is better than the conventional lateral microdisplacment sensor, by a factor of 2.
