Highly sensitive bending sensor based on multimode–multimode–coreoffset fiber structure

Animals Chew Monitoring System Design based on MSP430

“…Its internal registers are shown in Figure 6 below time: DS1302 clock chip data reading and writing, is wholly dependent on the I/O port of serial communication. Once every to read and write operations, also need to read and write at least 2 bytes of data, one of the first byte is to control the bytes, as well as a command, it will tell DS1302 clock chip is to read or to write, it is operated in RAM or CLOK register, and then the rest of a byte is DS1302 clock chip to read or write data [4]. Reading and writing data a total of seven.…”

Simultaneous measurement of curvature and temperature based on LP 11 mode Bragg grating in seven-core fiber

“…Fiber sensors have been widely studied because of its inherent advantages [1]. Many types of fiber curvature and temperature sensors based on different principles have been reported, such as, fiber Sagnac interferometer [2], DBR fiber laser [3], FBG [4], long-period fiber grating (LPFG) [5], chirped fiber Bragg grating [6], tilted fiber Bragg grating [7], Fabry-Pérot Interferometer [8], Erbium doped fiber [9], Mach-Zehnder interferometer [10], few mode fiber [11], polymer Fiber [12], dual-concentric-core fiber [13], homogeneous four-core fiber [14], photonic crystal fiber (PCF) [15] and so on. The sensors reported above have the advantages of high sensitivity, high resolution, large measurement range, but there are still some problems that need to be solved.…”

A Novel Low-Cost, Large Curvature Bend Sensor Based on a Bowden-Cable

“…Optical fiber-based sensors detect bending by measuring changes of intensity, phase, wavelength, or polarization of the light inside a bending optical fiber [ 3 , 4 ]. The elaborate and intensive techniques used to manufacture the optical fiber and sophisticated signal processing of the light spectrum enable highly sensitive measurements of fiber shape changes [ 21 ]. Also, these sensors take advantage of the physical properties of optical fibers, including small diameter and flexibility.…”

“…Grating-based sensors including fiber Bragg gratings (FBGs) and long-period fiber gratings (LPFGs) measure the intensity variation of the fiber’s resonant dip wavelength [ 23 , 24 , 25 , 26 ]. An expensive device—an interrogator—is used to measure and analyze the spectrum of the light, and complicated signal processing is required to convert the spectrum data into shape information [ 3 , 4 , 21 ]. It is possible but difficult to minimize the effect of temperature and nonlinearities via special fabrication techniques [ 24 , 27 ].…”