Abstract
Based on the low-coherence interferometric principles, a cost-effective all-fiber Mach-Zehnder multiplexing system is proposed and demonstrated. The system consists of two interferometers: sensing interferometer and demodulation interferometer. By scanning an optical tunable delay line back and forth constantly with a stable speed, sensing fibers with different optical paths can be temporal interrogated. The system is experimentally proved to have a high performance with a good stability and low system noises. The multiplexing capacity of the system is also investigated. An experiment of measuring the surrounding temperature is carried out. A sensitivity of 12 μm/°C is achieved within the range of 20°C to 80°C. This low cost fiber multiplexing system has a potential application in the remote monitoring of temperature and strain in building structures, such as bridges and towers.
Highlights
Fiber optical sensors have been widely researched in the fields of physics, chemistry, bio-medicine, and industry [1,2,3,4,5] in recent decades because of their high performance compared with the traditional electronic sensors
We demonstrate a cost-effective all-fiber multiplexing sensing scheme based on Low coherence interferometry (LCI) [12], which measures the absolute optical path difference between reference fiber and sensing fiber
The output signal is detected by an InGaAsbased photodetector which is connected by a data acquisition (DAQ) card installed in the computer
Summary
Fiber optical sensors have been widely researched in the fields of physics, chemistry, bio-medicine, and industry [1,2,3,4,5] in recent decades because of their high performance compared with the traditional electronic sensors. Low coherence interferometry (LCI), white light interferometry, has been widely developed as a multiplexing sensing system with high sensitivity, large measurement range, high resolution, and low cost. Meng JIANG et al.: Cost-Effective Fiber Multiplexing System Based on Low Coherence Interferometers and Application to Temperature Measurement difference. The sensing interferometer which can transfer sensing signal to phase delay can be multiplexed and interrogated by the LCI system. We demonstrate a cost-effective all-fiber multiplexing sensing scheme based on LCI [12], which measures the absolute optical path difference between reference fiber and sensing fiber. The interrogation of the system is realized by scanning an optical tunable delay line with a stable speed This multiplexing system provides high performance with a good stability and low system noises. A sensitivity of 12 m/°C is achieved within the range of 20 °C to 80 °C by our system
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