FUEL DETECTION SYSTEM USING OTDR WITH MULTIMODE FIBER
DOI:
https://doi.org/10.11113/jt.v79.7686Keywords:
Fiber sensors, chemical liquid sensing, optical time domain reflectometer, multipoint optical fiber sensorAbstract
This work presents an optical fiber based sensor for fuel detection and adaptionan optical time domain Reflectometer (OTDR) as an analyzer. The sensing system consists of a portion of removal clad multimode fiber (MMF) as sensing part connected  between a receive and launch fiber. The sensing part was prepared by removing 1 cm of the MMF cladding layer using chemical etching technique. Both launch and receive fibers are using single mode fiber (SMF) where OTDR is connected to the Launch Fibre while Receive Fiber has one end with air interface.The sensor response is based on optical return loss recorded from OTDR trace when sensing part in contact with fuel where in this work diesel and benzene were tested. OTDR measurement revealed that the return loss recorded from OTDR increases when etching time of the MMF increases. The highest return loss of 2.462 dB and 3.099 dB were recorded in diesel and benzene respectively with etching time of 20 minutes. The etching time was up to 25 minutes but it was found to cause the fiber core become too thin and at the end the fiber core can completely dissolve. Further enhancement of detection sensitivity was achieved by using two-point MMF sensing system.
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