Reflection-based fiber specklegram sensor
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AuthorRodríguez Cobo, Luis; Lomer Barboza, Mauro Matías; Ruiz Lombera, Rubén; Cobo García, Adolfo; López Higuera, José Miguel
In this paper, a Fiber Specklegram Sensor (FSS) based on Plastic Optical Fiber (POF) has been proposed with a reflection-based configuration. A HeNe laser is launched through a coupler, reflected by a mirrored fiber end and detect the specklegram sequence using a commercial camera. Different sensor performance metrics have been analyzed in terms of final sensitivity to external vibration applied to the fiber. The results confirm the performance reduction of the reflection-based scheme in comparison with the transmission-based approach but it can be also employed as sensing system where only a single fiber end is available.