It is suggested and designed to use Terfenol-D magnetostrictive material in a fiber extrinsic F-P interferometric magnetic field sensor. The two reflective end faces of the F-P cavity are, respectively, the copper reflective layer and the fiber end face. As a result, changes of the magnetic field have an impact on the F-P cavity's cavity length, and the environmental magnetic field can be detected by measuring the variation in cavity length. The typical relationship between magnetic field and spectral drift of the sensor is theoretically analyzed. The sensitivity is measured experimentally to be 0.82 nm/mT for a magnetic field intensity of 0 mT to 70 mT at room temperature. The sensor has a compact structure, and the complexity of the low-level interference signal demodulation makes it suitable for use in engineering.
This paper first briefly describes the transport protocol, topology, technical characteristics and application status of the typical military electronic system MIL-STD-1553B bus. With respect to defects such as the bus bandwidth shortage, limited fault tolerance and complicated maintaining, this paper proposes a PON architecture based bus-type optical fiber data bus (FTB) technology with high bandwidth, low latency and strong fault tolerance. This paper mainly studies the bus topology based on the passive optical network (PON) architecture, the physical layer design based on burst mode laser drive circuit (BM-LDD) as well as the digital burst automatic power control circuit, and the design based on multi-point control protocol (MPCP) of time-division response mode. The designed optical fiber bus provides real-time, high-speed and highly reliable communication links for information exchange (video, audio, radar, distributed sensor data, etc.) between various electronic systems of military weapons. It can also accumulate technology for engineering application of optical fiber data bus technology.
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