Optical fiber measurement method of large scale charge detonation velocity and its application effect

2021 ◽  
Author(s):  
Huijuan Zhou ◽  
Jinyang Chen ◽  
Kui Huang ◽  
Shangjiang Yu ◽  
Yongsheng He
Keyword(s):  
Optical Fiber ◽  
Detonation Velocity ◽  
Measurement Method ◽  
Large Scale ◽  
Optical Fiber Measurement

Ultrasonic measurement of clamping force for injection molding machine

2019 ◽  
Vol 39 (4) ◽  
pp. 388-396 ◽  
Author(s):  
Peng Zhao ◽  
Yao Zhao ◽  
Jianfeng Zhang ◽  
Junye Huang ◽  
Neng Xia ◽  
...  
Keyword(s):  
Injection Molding ◽  
Measurement Method ◽  
Large Scale ◽  
Force Measurement ◽  
Low Cost ◽  
Ultrasonic Method ◽  
Injection Molding Process ◽  
Propagation Time ◽  
Clamping Force ◽  
Molding Process

AbstractAn online and feasible clamping force measurement method is important in the injection molding process and equipment. Based on the sono-elasticity theory, anin situclamping force measurement method using ultrasonic technology is proposed in this paper. A mathematical model is established to describe the relationship between the ultrasonic propagation time, mold thickness, and clamping force. A series of experiments are performed to verify the proposed method. Experimental findings show that the measurement results of the proposed method agree well with those of the magnetic enclosed-type clamping force tester method, with difference squares less than 2 (MPa)2and errors bars less than 0.7 MPa. The ultrasonic method can be applied in molds of different thickness, injection molding machines of different clamping scales, and large-scale injection cycles. The proposed method offers advantages of being highly accurate, highly stable, simple, feasible, non-destructive, and low-cost, providing significant application prospects in the injection molding industry.

The Optical Fiber Strain Monitoring Technology of Large-Scale Bridge

2012 ◽  
Vol 446-449 ◽  
pp. 3417-3421
Author(s):  
Shu Li Chen ◽  
Mu Biao Su
Keyword(s):  
Optical Fiber ◽  
Large Scale ◽  
Research Result ◽  
Strain Sensor ◽  
Bridge Structure ◽  
Stress Monitoring ◽  
State Monitoring ◽  
Strain Monitoring ◽  
Reliable Performance ◽  
Structure State

Application situation of optical fiber strain sensor used in bridge structure state monitoring is detailed introduced in this paper, two bridges which optical fiber strain sensor is adopted in construction stage stress monitoring and long-time stress monitoring in our country are introduced as example. According to the theoretical analysis of structures, the strain monitoring locations are selected. The composite technology between optical fiber strain sensor and concrete is researched. The installation technology and protect method between optical fiber strain sensor and steel girder are extracted, and advanced acquisition software is explored. Finally, the application foreground of optical fiber strain sensor is discussed. The research result indicates that the optical fiber strain sensor is extraordinary suitable for state monitoring of bridge structure because it has the merits of light structure and reliable performance.

scholarly journals Fiber Optic Vibration Sensors

2021 ◽  
Author(s):  
Putha Kishore ◽  
Dantala Dinakar ◽  
Manchineellu Padmavathi
Keyword(s):  
Optical Fiber ◽  
Measurement Method ◽  
Fiber Optic ◽  
Sensor Response ◽  
Vibration Sensor ◽  
Vibration Measurement ◽  
Sensor Design ◽  
Plastic Optical Fiber ◽  
Intensity Modulated ◽  
Vibration Sensors

The sensors presented in this chapter are fiber optic intensity modulated vibrations sensors which are non-contact (extrinsic sensor) to the vibrating object. Three sensors presented make use of non-contact vibration measurement method with plastic fiber using distinct designs, improvement of the sensor response and advantages of one sensor over the other for diverse applications. First discussed about dual plastic optical fiber vibration sensor design and its response. Secondly, discussed about 1x2 fused coupler plastic optical fiber vibration sensor design with advantages over the first one. Finally, discussed about the 2x2 fused coupler plastic optical fiber vibration sensor design along with advantages than other two methods. At the end reported the final results with comparison.

scholarly journals Experimental Study on Slope Deformation Monitoring Based on a Combined Optical Fiber Transducer

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Yong Zheng ◽  
Dong-Yan Liu ◽  
Zheng-Wei Zhu ◽  
Hong-Lin Liu ◽  
Bang Liu
Keyword(s):  
Optical Fiber ◽  
Empirical Formula ◽  
Large Scale ◽  
Base Material ◽  
Optical Loss ◽  
Deformation Monitoring ◽  
Landslide Monitoring ◽  
Sandy Clay ◽  
Measured Displacement ◽  
Clay Slopes

Landslide monitoring is very important in predicting the behavior of landslides, thereby ensuring environment, life, and property safety. On the basis of our previous studies, a novel combined optic fiber transducer (COFT) for landslides monitoring and the related analysis methods are presented. Based on the principles of optical fiber microbending loss, the empirical formula of the shearing displacement of sliding body versus optical loss was established through a stretching test of optical fiber bowknot. Then the COFT grouting direct shearing tests, a large-scale landslide model test, and numerical modeling verification with FLAC3D are carried out. According to the results, the initial measurement precision of the designed COFT in sandy clay is 1 mm; its monitoring sliding distance is larger than 26.5 mm. The calculated values based on empirical formula are in good agreement with the laboratory tests and numerical simulation results. When the ratio of cement and sand in mortar is 1 : 5, the error between the calculated displacement and the measured displacement of sliding surface is the smallest. The COFT with expandable polystyrene (EPS) as its base material performs better in monitoring sandy clay slopes because both the error and the mean square deviation of the empirical formula are smaller.

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