In this paper, we described a distributed strain measurement scheme in one-dimensional. The sensing information
of FBG is demodulated by a CCD spectrometer, the discrete strain is achieved by fitting and processing discrete
signal demodulated utilizing labVIEW virtual instrument technology. Then it could be achieved by Using
polynomial fitting method to one-dimensional discrete strain distributed detection. Experimentally, measurement
was implemented in Cantilever to prove the system performance. The experimental result shows that the system
can reflect the strain distribution in one-dimensional and an order strain modal characteristics of cantilever
accurately. The detection system can achieve real-time and dynamic measurements, the response time for 2kHz,
the response accuracy for 4μ(epsilon).
A novel all-fiber Mach-Zehnder modal interferometer (MZMI) for temperature and strain measurements is demonstrated. The interference between the core and the cladding modes in the single mode fiber (SMF) is utilized. To excite the cladding modes, a microcavity is embedded in the SMF. After propagating a distance in the cladding, the cladding modes will couple back to the core mode at the other point fabricated by core-offset splicing. The MZMI exhibits a high temperature sensitivity (<0.1nm/ °C) in the range of 200-600 (°C). The strain response of the MZMI is also investigated. This compact, simple and cost-effective MZMI owns potential applications in temperature and strain measurements.
In this study, an innovative temperature-insensitive and no adhesive package for FBG pressure sensor was designed. We presents an package construction to compensate for temperature deviation of a FBG by mechanical properties of different metal materials; the package realize no adhesive utilizing combined technique of electroless plating NI-P and electroplating NI and laser spot welding technology. On the basis of the study on the Material structural properties and the compensation principles analysis of the FBG, the finite element method is used to analysis of the feasibility of the construction and optimize the construction parameters. The results show that this compensation construction can effectively reduce the temperature sensitivity of the FBG.