Porosity Evaluation of Composites Using the Encapsulated Cantilever Fiber Bragg Grating Based Acousto-Ultrasonic Method

Cantilevered Microfiber Bragg Grating Sensor With High Ultrasonic Sensitivity and Designable Resonant Frequency

“…This outstanding ultrasonic sensing performance and the flexibility in the design of the resonant frequency allow the CMFBG used to have the potential for a large number of practical applications, especially for the detection of lowamplitude and frequency-determined signals. In addition, suitable encapsulation technology can be implemented on the CMFBG to protect the sensor from the environmental fluctuations [16]. It is our view that by replacing the FBG with a PSFBG within the CMFBG, the sensitivity of the sensor could be further improved.…”

“…In addition to these broadband FBG sensors, several types of resonant FBG sensors have also been studied, such as the cantilevered FBG (CFBG) [15], [16]. As one end of the CFBG is fixed and the other end is free, this creates a short cantilever beam, where the direct wave and the reflected wave can Nanjing University of Aeronautics and Astronautics, No.…”