27 April 2010 Nonintrusive FBG tube pressure transducers with high overpressure ability
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Fiber optic sensors offer several advantages over their electrical counterparts, especially for applications in hostile, spark-sensitive environments, because no electrical power is required at the sensors. In addition, the installation of fiber sensors external to fluid carrying conduits facilitates access for troubleshooting and replacement, unlike in-line diaphragm-based sensors. Furthermore, glass fiber pressure sensors have a much higher operating temperature range, which makes them more practical for flammability-prone environments. Multiple fiber Bragg grating (FBG) sensors can be multiplexed along a single fiber optic cable, as opposed to traditional resistive strain gauges, which require individual shielded metal cabling. Applications for such fiber-optic pressure detection systems include the pressure monitoring of flow in fuel lines and their pressure valves. This paper characterizes the application of FBG sensors, with remote access capability, for the nonintrusive pressure monitoring of different types of metallic pipes. We show that pressure changes smaller than one psi can be detected with a tunable diode laser-based detection system. Standard metal pipes of steel, inconel, copper-nickel alloy and titanium are characterized, and the resilience of FBG sensors to an overpressure of up to 1500 psi is demonstrated.
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Indu Fiesler Saxena, Indu Fiesler Saxena, Kaleonui J. Hui, Kaleonui J. Hui, "Nonintrusive FBG tube pressure transducers with high overpressure ability", Proc. SPIE 7677, Fiber Optic Sensors and Applications VII, 76770M (27 April 2010); doi: 10.1117/12.855062; https://doi.org/10.1117/12.855062

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