Fiber-Optic Point-Based Sensor Using Specklegram Measurement.

Sensors (Basel)

College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China.

Published: October 2017

Here, we report a fiber-optic point-based sensor to measure temperature and weight based on correlated specklegrams induced by spatial multimode interference. The device is realized simply by splicing a multimode fiber (MMF) to a single-mode fiber (SMF) with a core offset. A series of experiments demonstrates the approximately linear relation between the correlation coefficient and variation. Furthermore, we show the potential applications of the refractive index sensing of our device by disconnecting the splicing point of MMF and SMF. A modification of the algorithm in order to improve the sensitivity of the sensor is also discussed at the end of the paper.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5677025PMC
http://dx.doi.org/10.3390/s17102429DOI Listing

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