Abstract
Large-scale installation of optical fiber sensors in an industrial or military environment is handicapped for several reasons. However, optical fibers are widely accepted to be applied for data transmission. An optically powered sensor system is proposed in which conventional well-proven transducers and data transmission along optical fibers are combined. The fiber is also used to transmit 10 mW of optical power from a remote control unit to the sensor head. In the sensor head the optical power is converted into electrical power to supply the sensor and datatransmission electronics. When a minimum supply voltage level of 4 V is detected, the pressure or temperature is sampled and a pulse position modulated (PPM) signal is transmitted along the fiber to the control unit, where it is demodulated. Feasibility of the system was demonstrated in the laboratory, and field experiments are planned. Alternative system configurations are discussed, in which intelligence is incorporated in the sensor head.
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