The sealing state of the watertight door (SSWD) is important information for the safe operation of a ship. A monitoring method for the SSWD based on fiber Bragg grating (FBG) sensor is designed, which can monitor the opening and closing state of the watertight door in real-time. A highly sensitive and temperature-independent sensor is installed under the rubber of the watertight door, the relationship between the displacement of the door panel and the wavelength shift of FBG is linearly fitted with the sensitivity of about 314.511 pm / mm, and the error percentage with the finite element analysis is 6.22%. The watertight door is opened and closed many times, the results show that the sensor has good stability and reliability, and the opening state, closing state, and the degree of opening and closing can be accurately judged by the wavelength shift of FBG. At the same time, the sensor can also identify the foreign body within a certain range on the rubber surface.
Axle counting device is the key basic equipment of rail transit signal system. Given that current circuit axle counting equipment is vulnerable to electromagnetic interference, an axle counting sensor based on Fiber Bragg grating (FBG) is designed. Taking the continuous support beam model of the track as the theoretical sensing model, the strain curve of the rail bottom under the static load of the axle is analyzed. The FBG strain sensor is used to detect the bending strain when the train passes through the rail, two FBG strain sensors with high sensitivity are installed on the axle counter to accurately identify the number of train axles through the center wavelength drift curve of the two FBGs, and to identify the running direction of the train according to the time sequence of the response of the two FBGs. The axle counter has been tested and verified on the spot, the results show that it can accurately reflect the number of axles of the train and the direction of the train in real time. The axle counting sensor is installed on the bottom of steel rail through the fixture, which has the advantages of simple structure and convenient installation, and has a good engineering application prospect.
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