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A novel integrated optical electric field sensor especial for sub-nanosecond intense electromagnetic pulse measurement is designed and analyzed considering multi-physics coupling condition in COMSOL software. Sensor element combined tapered antenna and electrode is analyzed in XFDTD software. The model is verified by setting maximum mesh size based on the restriction in electromagnetic wave vector...
A sensitivity optimization scheme of optical coupling fiber sensor (OCFS) focusing on three factors has been presented and the optimized OCFS for partial discharge detection has been demonstrated experimentally. First, removing the pre-tension during fabrication can dramatically increase the sensitivity of OCFS. It can be explained that longitude pre-tension makes the sensor hard to vibrate transversely...
An improved optical fiber coupler sensor (OFCS) has been used for AE source location on plate-like structures with model acoustic emission (MAE) method, which provide a liner locating strategy with only one sensor. To identify flexural mode (A0) and longitude mode (S0) visibly, Gabor wavelet transform (GWT) has been introduced and applied on time-frequency analysis of AE signals. Based on MAE method,...
Aim at the fuzziness and grey characteristics of evaluation index information of not fully navigable route, this paper establishes navigation condition evaluation model that based on the grey-cloud whitening-weight function clustering theory. Based on the case study of evaluating Northeast Passage navigation condition, the result shows the Northeast Passage navigation condition is in the “unsafe navigation”...
The responses of ultrasonic sensor with different structure parameters to acoustic emission of partial discharge have been investigated numerically and experimentally. By taking into account both the elasto-optic effect and the geometric effect, a comprehensive analysis of the ultrasonic sensing mechanism is presented. It is found that a direct deformation of the sensor induced by acoustic emission...
With the development of wind power industry, early detection and diagnosis of incipient faults are desirable for the wind generators. A suitable model enables generator faults to be simulated and it is particularly useful for gaining an insight into their dynamic behavior and electro-mechanical interaction. In this paper a model of DFIG (Doubly-Fed Induction Generator) affected by stator inter-turn...
A new multi-parameter monitoring system based on wireless sensor network is introduced in the paper. The system synthetically applies the technology of modern sensor, circle system and wireless data transmission. Multi-parameter collection, transmission and display of the water environment, such as salinity, temperature, are realized by the system, and the fast and accurate transmission of the data...
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