Cascaded arrangement scheme and data processing algorithm for ship lock fiber bragg grating water level measurement system

Abstract

Water level measurement technology plays an important role in the operation of ship locks, and fiber optic grating sensors, as a new type of passive sensor, have great potential in the field of ship lock water level measurement. In order to establish a precise and reliable ship lock water level measurement system, a cascade arrangement scheme for the fiber optic grating water level measurement system in the ship lock was designed, which is easy to be connected in series, combined with the water level change characteristics during the operation of the ship lock. This scheme can further improve the actual measurement accuracy when measuring the water level difference inside and outside the ship lock, while the accuracy of the sensor itself is fixed. Based on this layout plan, a calibration algorithm was designed for zero drift and slope drift of the water level gauge. The calibration algorithm runs during the filling and discharging of the ship lock, and the water level gauge is calibrated step by step. In addition, a data fusion algorithm based on the Kalman filter principle was designed for the effective water level gauge data in the cascade layout scheme, and the effectiveness of the algorithm was verified through simulation.

Keywords

ship lock / fiber bragg grating water level measurement system / cascaded arrangement scheme / water level gauge calibration / water level gauge data fusion