Impact and vibration detection in composite materials by using intermodal interference in multimode optical fibers

Fiber specklegram sensors (FSS) for measuring high frequency mechanical perturbations

“…FSS have been widely studied by using holographic setups based on photorefractive materials [8][9][10][11][12][13], however, more recently, non-holographic fiber specklegram sensors for measuring several engineering parameters have been reported [14][15][16][17][18][19][20]. About non holographic techniques two possibilities have been reported.…”

Detecting Impacts on a Representative Aerospace Structure: An Implementation with Tests

“…A range of approaches are available in literature. Prime examples include research performed into insulating foam strikes following the loss of the space shuttle Columbia [6], approaches involving the use of embedded optical fibres [7,8], and approaches from the non-aerospace sectors, such as pipeline impact detection and monitoring [9]. These approaches have met with much success and now have a wide range of applications in structural health monitoring, extensively validated by experimental results [10,11,12].…”

Influence of the volume speckle on fiber specklegram sensors based on four-wave mixing in photorefractive materials

“…These sensors have been widely studied by their potential applications in several engineering fields. [2][3][4][5][6][7][8][9][10][11][12]. Holographic FSS setups have been mainly developed by recording speckle patterns on photorefractive materials and optically performing self-correlation operations [3][4][5].…”