Low-cost multiple FBG interrogation technique for static applications

Abstract

In this Letter, a low-cost interrogation technique for multiple fiber Bragg gratings (FBGs) is demonstrated. The design utilizes the major advantage of the distributed feedback lasers, which is tuning their emitted wavelength by current modulation and temperature variation. The sensitivity of this method and the influence of optical losses on the measurement have been carefully studied, and an accuracy of 5 pm is achieved.

All-optical real-time monitoring of air/vacuum valves in water pipeline systems using fiber Bragg gratings

“…While the interrogator cost is relatively high, the cost per instrumented point can be drastically lowered below the USD 1600 figure for the orifice plate considering dozens of FBGs can be multiplexed and monitored with the same interrogator. Furthermore, low-cost FBG interrogator setups with price points as low as USD 2000 are also detailed in the literature and can be assembled using readily available commercial components [24][25][26]. Such advantages make the use of encased FBG sensors very attractive for developing robust, long-term capable, and fully automated online monitoring systems for AVVs.…”

Sensing with coupled-core optical fiber Bragg gratings

“…To reduce the cost of the interrogation of FBG sensors, changes in the position of λB can be converted to intensity changes by means of edge filters, interferometers or similar wavelength-selective devices placed before a low-cost photodetector [2,3]. A drawback of these techniques is that the linear section and the useful wavelength range is limited.…”