Distributed strain sensing

Application of fully distributed strain sensing technology in a slope model test... 

Friebele E J, Askins C G, Putnam M A et at, Distributed strain sensing with fibre Bragg grating arrays embedded in CRTM composite , Electron. Lett., 1994, 30, 1783-1784. 

As fully distributed BOTDA sensors, the optical fiber has functions of sensing and data transmission. Using the newly developed PPP-BOTDA technology, the strain and temperature measurement accuracy can be increased to be 7 ie, and 0.3 °C, respectively, with a spatial resolution of 2 cm. Therefore, a high-accuracy slope strain sensing network can easily be constructed. The installation technique of this technology is relatively simple. The sensing fiber can be embedded in the slope mass or installed... 

The embedded BOTDA strain sensing fiber can measure the strain distributions within slope mass effectively. 

The model test study verifies the capability of the fiber optic sensing network to monitor the stability of slope with high accuracy. The distributed strain monitoring results may indicate the location of the potential slip surface in the slope. 

Thostenson, E.T., Chou, T.W., 2006. Carbon nanotube networks sensing of distributed strain and damage for life prediction and self healing. Advanced Materials 18 (21), 2837—2841. 

Thostenson ET, Chou TW. Adv Mater. 2006, 18, 2837-2841. Carbon Nanotube Networks Sensing of Distributed Strain and Damage for Life Prediction and Self-Healing. 

Inaudi, D. Glisic, B Development of distributed strain and temperature sensing cables. 17th Int. Conf. on Optical Fiber Sensors (OFS-17). SPIE-Vol. 5855 (2005), pp. 222-225... 

Huang S, Ohn M M and Measures R M, A novel Bragg grating distributed-strain sensor based on phase measurements . In Proc. SPIE - Smart Structures and Materials 1995 Smart Sensing, Processing, and Instrumentation, 1995, 2444, 158-69. 

Fig. 4. Simulation of a single 3 m clay bed (outlined in black) in homogeneous sand faulted to form a clay smear. Filled contour plot of shear strain rate showing concentration of rate of faulting in the section of the clay bed now forming the smear. Fault induced by velocity distribution imposed at base of model to simulate basement dislocation. Contour interval 5E-5 per unit time shown only to explain the sense of the strain rate increase.

A fully distributed fiber optic sensing network was established to monitor strain distributions within the slope model. The layout of the sensing network is shown in Figure 3. 

BOTDA sensing technology was employed to monitor the strain distributions within the slope mass. The fiber optic monitoring results from the sensors are presented and interpreted in detail. From this experimental study, the following conclusions are drawn ... 

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