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Fiber-Optic Point-Based Sensor Using Specklegram Measurement

College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China
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Sensors 2017, 17(10), 2429; https://doi.org/10.3390/s17102429
Received: 14 September 2017 / Revised: 14 October 2017 / Accepted: 14 October 2017 / Published: 24 October 2017
(This article belongs to the Section Physical Sensors)
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. View Full-Text
Keywords: speckle interferometry; laser patterns; speckle correlation speckle interferometry; laser patterns; speckle correlation
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Wang, J.-J.; Yan, S.-C.; Ruan, Y.-P.; Xu, F.; Lu, Y.-Q. Fiber-Optic Point-Based Sensor Using Specklegram Measurement. Sensors 2017, 17, 2429.

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