Design of Polarization-Maintaining FBGs Using Polyimide Films to Improve Strain-Temperature Sensing in CFRP Laminates

Distributed Strain and Temperature Discrimination in Unaltered Polarization Maintaining Fiber

A Rayleigh scatter-based distributed measurement technique is presented in which strain and temperature discrimination is achieved using standard polarization maintaining fiber as the sensor. High-sensitivity Optical Frequency Domain Reflectometry is used to measure the scatter.

Dynamic strain distribution monitoring of 5.5 m CFRP blade using 5 m FBGs interrogated by optical frequency domain reflectometry

We have developed an optical frequency domain reflectometry (OFDR) system which is capable of conducting distributed strain measurements with a sampling rate of 150 Hz, a spatial resolution of less than 1 mm and a sensing range of 20 m. In this study, we applied this technique to monitor dynamic strain distributions along a 5.5 m helicopter blade structure with carbon fiber reinforced plastics ...

Hygrothermal Aging of Polyimide Matrix Composite Laminates

Two polyimide-matrix systems were subjected to a series of hygrothermal aging experiments at various temperatures and relative humidities. For each aging condition, we measured the microcracking fracture toughness as a function of aging time. The toughness decreased with time. The rate of decrease increased with temperature and relative humidity. All experimental results could be fit to a simpl...

Electromagnetic Shielding Property of Cfrp Composite Laminates

Temperature and strain sensitivity measurements of high-birefringent polarization-maintaining fibers.

The strain and temperature sensitivities of three common commercial high-birefringent polarizationmaintaining fibers (bow-tie, polarization-maintaining and absorption-reducing, and elliptical core fibers) have been measured by using a dynamic polarimetric method. The experimental setup and measuring process are described in detail. Where possible, the measuring data are compared with published ...