This paper describes the development of a complete fiber optic sensor network demonstrator, installed on a Naval Warfare simulator system. It incorporates a 64 ON/OFF multiplexed optical sensor network together with single point analog optical sensors. A complete description of the system is given showing the different sensors that have been developped and their specific applications. We also discuss the experimental results and the potential advantages of this technology for naval systems.
The OPTONET system monitors up to 64 ON/OFF fiber optic sensors. It is based on Optical Time Domain Reflectometry (OTDR). An optical pulse emitted by a pulsed laser diode is splitted between the sensors through an optical star network including delay lines to separate the pulses reflected back from the sensors. A dual wavelength emission board is implemented to garantee line surveillance and optical path loss compensation, in order to minimize the error rate, and information discrepancy. These characteristics also combined with the well known advantages of fiber optic sensors make this system attractive in military or harsh environment. Various reflective sensors can be connected to the OPTONET system ; we describe here sensors developped for a French Navy application.The system developped and described hereafter is dedicated to the monitoring of a French Navy system. The aim was to build a complete fiber optic sensor network demonstrator to evaluate the advantages and the viability of this new type of system for a specific Naval application. The overall system, includes ON/OFF sensors, such as limit switches, water detection sensors, together with analog single point sensors. This paper will only focus on the ON/OFF sensor network.The principle of the system is based on OTDR 1,2,3,4,5 and derived from previous developments. The system has four optical outputs and incorporates two detectors and an optical star architecture network (Figure 1). The effort was focused to secure the information. So a dual wavelength scheme was implemented to achieve optical path loss compensation and optical line surveillance. In each sensor is incorporated a dichroic filter that is reflective at the chosen reference wavelength. The measurement wavelength pulse is transmitted to the transducer and reflected or not according to the sensor state. A line failure is detected by the absence of the reflected pulse at the reference wavelength. Secondly the sensor state information is IO2)given by the computation of the ratio R = J() where 1(X1) is the peak intensity of the reflected pulse at the reference wavelength and 1(X2) the peak intensity of the reflected pulse at the measurement wavelength. A loss on the optical path to the sensor will not affect the ratio R, and we can hence achieve optical line neutrality. Furthermore, the laser diodes emitted power are stabilized, by controlling the drive current. The system sets an alarm on when their drive current has reached the maximum value to signal to the user that maintenance has to take place. 244 ISPIE Vol. 2838 0819422266/96/$6.OO Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/29/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx
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