Composite Cure Monitoring With Infrared Transmitting Optical Fibers

1989 ◽  
Author(s):  
Mark A. Druy ◽  
Lucy Elandjian ◽  
W. A. Stevenson
Keyword(s):  
Optical Fibers ◽  
Cure Monitoring

Strain measurement and cure monitoring in thin plates of composite materials by using twisted optical fibers

1996 ◽  
Author(s):  
Huiwen Wang ◽  
Jan Wu ◽  
Naiji Li ◽  
Hongjun Cao ◽  
Di Dai ◽  
...  
Keyword(s):  
Composite Materials ◽  
Optical Fibers ◽  
Strain Measurement ◽  
Thin Plates ◽  
Cure Monitoring

1705 Cure Monitoring of Chain Curing Polymer Using Optical Fibers

2005 ◽  
Vol 2005.6 (0) ◽  
pp. 155-156
Author(s):  
Katsuhiko Osaka ◽  
Shinichi Takasaki ◽  
Tatsuro Kosaka ◽  
Yoshihiro Sawada
Keyword(s):  
Optical Fibers ◽  
Cure Monitoring

Luminance Change Method for Cure Monitoring of GFRP

2006 ◽  
Vol 321-323 ◽  
pp. 1316-1321 ◽  
Author(s):  
Akira Todoroki ◽  
Norihiko Hana ◽  
Masahito Ueda
Keyword(s):  
Optical Fibers ◽  
Polyester Resin ◽  
Low Cost ◽  
Electrical Circuit ◽  
Matrix Resin ◽  
Degree Of Cure ◽  
Luminance Change ◽  
Light Power ◽  
Cure Monitoring ◽  
Rtm Process

Resin transfer molding (RTM) process is getting popular for fabrications of complicated commercial products made from Glass Fiber Reinforced Polymer (GFRP) at low cost. Cure monitoring is indispensable for RTM process. In the present study, polyester resin is adopted for matrix resin of the GFRP components. The polyester is usually adopted as matrix resin of the low-cost GFRP products. Existing methods for the cure monitoring are, however, expensive for the GFRP products. The polyester resin usually changes its optical property during curing. This enables us to monitor the degree of cure by means of measurements of luminance change of the transmitted light. Since the electrical circuit for measuring luminance change is not expensive, this system utilizes the luminance change for monitoring cure is not expensive system. In the present study, the sensing system employs a LED as a light source and plastic optical fibers as light paths. A photodiode is adopted as a light power sensor. This low-cost cure-monitoring system is applied to monitoring of degree of cure of polyester resin. Degree of cure is measured by means of commercially available dielectric sensors, and results are compared with the results of luminance change. The effectiveness of the method is confirmed experimentally here.

High-voltage monitoring by the fiber-optic recirculating measuring system

2020 ◽  
pp. 38-44
Author(s):  
A. V. Polyakov ◽  
M. A. Ksenofontov
Keyword(s):  
Optical Fibers ◽  
High Voltage ◽  
Optical Sensors ◽  
Electromagnetic Interference ◽  
Fiber Optic ◽  
Electric Power Industry ◽  
Measuring System ◽  
Voltage Range ◽  
External Electromagnetic Fields ◽  
Optic Communication

Optical technologies for measuring electrical quantities attract great attention due to their unique properties and significant advantages over other technologies used in high-voltage electric power industry: the use of optical fibers ensures high stability of measuring equipment to electromagnetic interference and galvanic isolation of high-voltage sensors; external electromagnetic fields do not influence the data transmitted from optical sensors via fiber-optic communication lines; problems associated with ground loops are eliminated, there are no side electromagnetic radiation and crosstalk between the channels. The structure and operation principle of a quasi-distributed fiber-optic high-voltage monitoring system is presented. The sensitive element is a combination of a piezo-ceramic tube with an optical fiber wound around it. The device uses reverse transverse piezoelectric effect. The measurement principle is based on recording the change in the recirculation frequency under the applied voltage influence. When the measuring sections are arranged in ascending order of the measured effective voltages relative to the receiving-transmitting unit, a relative resolution of 0,3–0,45 % is achieved for the PZT-5H and 0,8–1,2 % for the PZT-4 in the voltage range 20–150 kV.

POF — Polymer Optical Fibers for Data Communication

2002 ◽  
Author(s):  
Werner Daum ◽  
Jürgen Krauser ◽  
Peter E. Zamzow ◽  
Olaf Ziemann
Keyword(s):  
Optical Fibers ◽  
Data Communication ◽  
Polymer Optical Fibers
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